diff --git a/hw1/.hw1pr1.cpp.swp b/hw1/.hw1pr1.cpp.swp
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index 0000000..7ec6655
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diff --git a/hw1/.hw1pr2_data.txt b/hw1/.hw1pr2_data.txt
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index 0000000..37f9285
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\ No newline at end of file
diff --git a/hw1/420hw1-17fall.txt b/hw1/420hw1-17fall.txt
new file mode 100644
index 0000000..fb62115
--- /dev/null
+++ b/hw1/420hw1-17fall.txt
@@ -0,0 +1,133 @@
+(Print this page as a cover sheet for your printouts)
+
+CSCE 420 HOMEWORK 1 (UPDATED)
+Dr. Daugherity
+Section: ______________ 
+Due: 11:59 P.M. Monday, October 2, 2017
+
+"On my honor, as an Aggie, I have neither given nor received any unauthorized 
+aid on any portion of the academic work included in this assignment."
+
+
+________________________________	________________________________
+Typed or printed name of student	           Signature of student
+
+NOTE:  Please follow your lab instructor's directions for submitting your 
+assignment through CSNET.  ONLY ASSIGNMENTS SUBMITTED TO CSNET WILL BE GRADED!
+Make a printout of each source file and staple it behind this cover sheet.
+Sign it and turn it in in class Tuesday.  IF YOU DO NOT TURN IN A SIGNED COVER 
+SHEET YOUR WORK WILL NOT BE GRADED!
+
+NOTE:  Homework will be graded on build.tamu.edu, using g++ 7.2.0 with 
+-std=c++17, or javac and java, or python3.6 (not python or python2 or python3).
+
+You are free to develop your programs on any other platform, but it is your 
+responsibility to make sure your programs also compile and execute correctly on
+build.tamu.edu as specified.
+
+NOTE:  Each file submitted (hw1pr1.cpp, etc.--see below) must begin as follows:
+//Your name and UIN
+//CSCE 420
+//Due: Ocotber 2, 2017
+//hw1pr1.cpp (or whatever this file name is)
+
+NOTE:  Also write a README.txt file with whatever information is needed to
+compile and run your programs.  Zip the README.txt and the homework files into
+a single file named hw1.zip and submit to CSNET.
+
+The grade for this lab will be based on style (formatting, variable names, 
+comments, etc.), syntax (no compilation or link errors), and correctness 
+(passes all test cases).  Your grade for this lab is:
+Problem #	 1       2       3       4 
+Style             /2      /4      /4      /2 
+Syntax            /3      /6      /6      /3 
+Correctness       /5      /10     /10     /5
+-------------------------------------------------------------------
+Total             /10     /20     /20     /10
+Grand total _____/50
+
+1. (10 points) Given a file containing a list of points (x,y) in the plane, 
+write a greedy best-first search to find a closed path connecting all the 
+points (the "Travelling Salesperson Problem") and output its length.  You may 
+assume that x and y are non-negative integers that will fit in a 32-bit int.  
+Each line of input will be the x and y coordinates for a point; keep reading 
+until EOF.  You may assume there will be no more than 10000 points and that
+the input file will be named hw1pr1_data.txt.
+
+For example, if the input file contains
+0 0
+0 1
+1 1
+1 2
+
+the output to the screen is (probably) 
+0 0
+0 1
+1 1
+1 2
+5.236
+
+The run time should be 60 seconds or less for up to 10000 points.  Hint: use 
+the UNIX timeout command to automatically stop execution after 60 seconds.  
+Name your program hw1pr1.cpp or Hw1Pr1.java or hw1pr1.py.
+
+2. (20 points) The shortest closed path for the example points in problem 1 is
+actually 4.828.  In other words, greeedy best-first search did not find the
+shortest path.  Modify your program for problem 1 to do an iterative deepening 
+search to the depth of the number of points, with the path cost the total 
+distance.  To keep the search space manageable only include the 4 nearest 
+unvisited points as successors when you expand a node.
+
+The run time should be 60 seconds or less for up to 10000 points.  Hint: use 
+the UNIX timeout command to automatically stop execution after 60 seconds.  
+Name your program hw1pr2.cpp or Hw1Pr2.java or hw1pr2.py.
+
+3. (20 points)  Write a breadth-first search program to solve 15-puzzle problems
+in the same way as the 8-puzzle in Figure 3.4 on page 71.  Keep track of the 
+number of nodes expanded and print that out along with the steps to solve the 
+problem.  Define the legal moves as "swap the blank with an adjacent tile,"
+resulting in the blank's moving up, down, left, or right.  A sample run should 
+look like this:
+
+	Enter 15-puzzle starting state by rows (0 for blank):
+	1,2,3,4,5,6,7,8,9,10,0,11,13,14,15,12
+	Enter ending state by rows (0 for blank): 
+	1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,0
+	Solution: 
+		Start	 1  2  3  4
+			 5  6  7  8
+			 9 10  0 11
+			13 14 15 12
+	Swap the blank
+		Right	 1  2  3  4
+			 5  6  7  8
+			 9 10 11  0
+			13 14 15 12
+			
+		Down	 1  2  3  4
+			 5  6  7  8
+			 9 10 11 12
+			13 14 15  0
+
+	Done!  Generated xx states.
+
+Note: To keep the time and memory requirements reasonable, your program only 
+needs to solve 15-puzzle problems which have a solution in 10 moves or less.
+Name your program Hw1Pr3.java or hw1pr3.cpp or hw1pr3.py.
+
+OPTIONAL EXTRA CREDIT 
+=====================
+4. (10 points)  Modify problem 3 to use A* or IDA* search with Manhattan
+distance for h; e.g., the starting state on page 103 has a Manhattan distance 
+of 18 from the goal state (the sum of the number of rows and columns each tile 
+must move from its starting position to its ending position).  You should see 
+a marked reduction in the number of states generated, especially for problems 
+which require more moves.  Here is a puzzle which requires 80 moves:
+
+	Enter 15-puzzle starting state by rows (0 for blank):
+	0,12,11,13,15,14,10,9,3,7,6,2,4,8,5,1
+	Enter ending state by rows (0 for blank): 
+	1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,0
+
+Your program should solve it in 60 seconds or less.  Name your program 
+Hw1Pr4.java or hw1pr4.cpp or hw1pr4.py.
diff --git a/hw1/README.txt b/hw1/README.txt
new file mode 100644
index 0000000..bb5bb8b
--- /dev/null
+++ b/hw1/README.txt
@@ -0,0 +1,15 @@
+reference for async pthreads: http://www.cplusplus.com/reference/future/future/wait_for/
+
+All other references used pretty much came from cplusplus.com
+
+To compile and run:
+
+I made a makefile that should compile the program regardless of the OS, but only tested linux.
+
+commands should be:
+
+compile: make, make clean
+
+run: ./hw1prX
+
+where X is the problem number.
diff --git a/hw1/hw1.zip b/hw1/hw1.zip
new file mode 100644
index 0000000..451ae00
Binary files /dev/null and b/hw1/hw1.zip differ
diff --git a/hw1/hw1pr1/hw1pr1.cpp b/hw1/hw1pr1/hw1pr1.cpp
new file mode 100644
index 0000000..f5aec5a
--- /dev/null
+++ b/hw1/hw1pr1/hw1pr1.cpp
@@ -0,0 +1,225 @@
+// Alexander Huddleston
+// 10/2/17
+// hw1pr1.cpp
+// Read a file of points, compute greedy best-first of a closed path between points.
+
+#include<stdio.h>
+#include<iostream>
+#include<fstream>
+#include<cmath>
+#include<future>
+#include<chrono>
+#include<vector>
+#include<climits>
+#include<unordered_set>
+
+using namespace std;
+
+// Double vector used to store list of squared distances between points.
+vector<vector<long int>> dmat;
+
+vector<tuple<int, int>> points;
+
+unordered_set<long int> relaxed_edges;
+
+void store_points(ifstream *input, string filename)
+{
+        input->open(filename);
+
+        string line = "";
+
+	string token = "";
+
+	tuple<int, int> temp_point;
+	get<0>(temp_point) = 0.0;
+	get<1>(temp_point) = 0.0;
+
+        while(getline(*input, line))
+        {
+                for(char c : line)
+		{
+			if(c == ' ')
+			{
+				get<0>(temp_point) = stof(token);
+				token = "";
+			}
+			else
+			{
+				token = token + c;
+			}
+		}
+
+		get<1>(temp_point) = stof(token);
+
+		token = "";
+
+		points.push_back(temp_point);
+        }
+
+	input->close();
+}
+
+void store_distances()
+{
+	long int d1 = 0.0;
+	long int d2 = 0.0;
+
+	tuple< int,  int> x;
+	tuple< int,  int> y;
+	get<0>(x) = 0.0;
+	get<1>(x) = 0.0;
+	get<0>(y) = 0.0;
+	get<1>(y) = 0.0;
+
+	vector<long int> tempvec;
+
+	for(int r = points.size() - 1; r >= 0; --r)
+	{
+		for(int c = 0; c < points.size() - (points.size() - r); ++c)
+		{
+			x = points.at(r);
+			y = points.at(c);
+
+			d1 = (get<0>(x) - get<0>(y));
+			d2 = (get<1>(x) - get<1>(y));
+
+			tempvec.push_back(d1*d1 + d2*d2);
+		}
+
+		dmat.push_back(tempvec);
+		tempvec.clear();
+	}
+}
+
+bool is_visited(vector<int> relaxed_edges, int index)
+{
+	for(int x : relaxed_edges)
+	{
+		if(x == index)
+		{
+			return true;
+		}
+	}
+
+	return false;
+}
+
+long double best_first(ifstream *input, string filename)
+{
+	// First, store the points from the file into global vector.
+        store_points(input, filename);
+
+	// Small optomization so we don't have to call points.size() so much.
+	long int n = points.size();
+
+	// Store squared distances into dmat.
+	// Ignore duplicate distances, 0 vectors.
+	store_distances();
+
+	// Find best-first shortest path.
+	
+	// Keep edges we've already visited.
+
+	// Store distance up to this point.
+	long double current_distance = 0;
+
+	// Using this to keep track of selected node.
+	long int current_node = 0;
+
+	long int selected_node = 0;
+
+	// Using this to keep track of min distance.
+	long int min_distance = 0;
+	
+	while(relaxed_edges.size() < (n - 1))
+	{
+		min_distance = INT_MAX;
+		for(int i = 0; i < (n - 1); ++i)
+		{
+			while(relaxed_edges.find(i) != relaxed_edges.end())
+			{
+				++i;
+				if(i == current_node)
+				{
+					++i;
+				}
+			}
+			if(i > (n - 1))
+			{
+				break;
+			}
+
+			if(i < current_node)
+			{
+				if(min_distance > dmat.at(i).at((n - 1) - current_node))
+				{
+					selected_node = ((n - 1) - i);
+					min_distance = dmat.at(i).at((n - 1) - current_node);
+				}
+			}
+			else
+			{
+				if(i == current_node)
+				{
+					++i;
+					if(i > (n - 1))
+					{
+						break;
+					}
+				}
+				if(min_distance > dmat.at(current_node).at((n - 1) - i))
+				{
+					selected_node = ((n - 1) - i);
+					min_distance = dmat.at(current_node).at((n - 1) - i);
+				}
+			}
+		}
+
+
+		relaxed_edges.insert((n - 1) - current_node);
+		current_node = selected_node;
+		current_distance += sqrt(min_distance);
+	}
+
+	current_distance += sqrt(dmat.at(current_node).at(0));
+	return current_distance;
+}
+
+int main()
+{
+        ifstream input;
+        
+        string filename = "hw1pr1_data.txt";
+        
+        future<long double> fut = async(best_first, &input, filename);
+        
+        chrono::milliseconds span(60000);
+        
+        while((fut.wait_for(span)==future_status::timeout) || input.is_open())
+        {
+        }
+
+        if(input.is_open())
+        {
+                input.close();
+        }
+	
+	long double total = fut.get();
+
+	tuple<int, int> tempx;
+	tuple<int, int> tempy;
+
+	long int temp;
+
+	for(long int i : relaxed_edges)
+	{
+		tempx = points.at(temp);
+		tempy = points.at(i);
+		cout << get<0>(tempx) << "\t" << get<1>(tempx) << "\t" << get<0>(tempy) << "\t" << get<1>(tempy) << endl;
+		temp = i;
+	}
+
+	cout << total << endl;
+
+        return 0;
+}
diff --git a/hw1/hw1pr1/hw1pr1_data.txt b/hw1/hw1pr1/hw1pr1_data.txt
new file mode 100644
index 0000000..37f9285
--- /dev/null
+++ b/hw1/hw1pr1/hw1pr1_data.txt
@@ -0,0 +1,5000 @@
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\ No newline at end of file
diff --git a/hw1/hw1pr1/makefile b/hw1/hw1pr1/makefile
new file mode 100644
index 0000000..1f556a9
--- /dev/null
+++ b/hw1/hw1pr1/makefile
@@ -0,0 +1,5 @@
+all: main.o
+main.o: hw1pr1.cpp
+	g++ -std=c++17 -lpthread hw1pr1.cpp -o hw1pr1
+clean:
+	rm -rf *.o hw1pr1
diff --git a/hw1/hw1pr2.cpp b/hw1/hw1pr2.cpp
new file mode 100644
index 0000000..0896dde
--- /dev/null
+++ b/hw1/hw1pr2.cpp
@@ -0,0 +1,225 @@
+// Alexander Huddleston
+// 10/2/17
+// hw1pr2.cpp
+// Read a file of points, compute interative best-first of a closed path between points.
+
+#include<stdio.h>
+#include<iostream>
+#include<fstream>
+#include<cmath>
+#include<future>
+#include<chrono>
+#include<vector>
+#include<climits>
+#include<unordered_set>
+
+using namespace std;
+
+// Double vector used to store list of squared distances between points.
+vector<vector<long int>> dmat;
+
+vector<tuple<int, int>> points;
+
+unordered_set<long int> relaxed_edges;
+
+void store_points(ifstream *input, string filename)
+{
+        input->open(filename);
+
+        string line = "";
+
+	string token = "";
+
+	tuple<int, int> temp_point;
+	get<0>(temp_point) = 0.0;
+	get<1>(temp_point) = 0.0;
+
+        while(getline(*input, line))
+        {
+                for(char c : line)
+		{
+			if(c == ' ')
+			{
+				get<0>(temp_point) = stof(token);
+				token = "";
+			}
+			else
+			{
+				token = token + c;
+			}
+		}
+
+		get<1>(temp_point) = stof(token);
+
+		token = "";
+
+		points.push_back(temp_point);
+        }
+
+	input->close();
+}
+
+void store_distances()
+{
+	long int d1 = 0.0;
+	long int d2 = 0.0;
+
+	tuple< int,  int> x;
+	tuple< int,  int> y;
+	get<0>(x) = 0.0;
+	get<1>(x) = 0.0;
+	get<0>(y) = 0.0;
+	get<1>(y) = 0.0;
+
+	vector<long int> tempvec;
+
+	for(int r = points.size() - 1; r >= 0; --r)
+	{
+		for(int c = 0; c < points.size() - (points.size() - r); ++c)
+		{
+			x = points.at(r);
+			y = points.at(c);
+
+			d1 = (get<0>(x) - get<0>(y));
+			d2 = (get<1>(x) - get<1>(y));
+
+			tempvec.push_back(d1*d1 + d2*d2);
+		}
+
+		dmat.push_back(tempvec);
+		tempvec.clear();
+	}
+}
+
+bool is_visited(vector<int> relaxed_edges, int index)
+{
+	for(int x : relaxed_edges)
+	{
+		if(x == index)
+		{
+			return true;
+		}
+	}
+
+	return false;
+}
+
+long double best_first(ifstream *input, string filename)
+{
+	// First, store the points from the file into global vector.
+        store_points(input, filename);
+
+	// Small optomization so we don't have to call points.size() so much.
+	long int n = points.size();
+
+	// Store squared distances into dmat.
+	// Ignore duplicate distances, 0 vectors.
+	store_distances();
+
+	// Find best-first shortest path.
+	
+	// Keep edges we've already visited.
+
+	// Store distance up to this point.
+	long double current_distance = 0;
+
+	// Using this to keep track of selected node.
+	long int current_node = 0;
+
+	long int selected_node = 0;
+
+	// Using this to keep track of min distance.
+	long int min_distance = 0;
+	
+	while(relaxed_edges.size() < (n - 1))
+	{
+		min_distance = INT_MAX;
+		for(int i = 0; i < (n - 1); ++i)
+		{
+			while(relaxed_edges.find(i) != relaxed_edges.end())
+			{
+				++i;
+				if(i == current_node)
+				{
+					++i;
+				}
+			}
+			if(i > (n - 1))
+			{
+				break;
+			}
+
+			if(i < current_node)
+			{
+				if(min_distance > dmat.at(i).at((n - 1) - current_node))
+				{
+					selected_node = ((n - 1) - i);
+					min_distance = dmat.at(i).at((n - 1) - current_node);
+				}
+			}
+			else
+			{
+				if(i == current_node)
+				{
+					++i;
+					if(i > (n - 1))
+					{
+						break;
+					}
+				}
+				if(min_distance > dmat.at(current_node).at((n - 1) - i))
+				{
+					selected_node = ((n - 1) - i);
+					min_distance = dmat.at(current_node).at((n - 1) - i);
+				}
+			}
+		}
+
+
+		relaxed_edges.insert((n - 1) - current_node);
+		current_node = selected_node;
+		current_distance += sqrt(min_distance);
+	}
+
+	current_distance += sqrt(dmat.at(current_node).at(0));
+	return current_distance;
+}
+
+int main()
+{
+        ifstream input;
+        
+        string filename = "hw1pr_data.txt";
+        
+        future<long double> fut = async(best_first, &input, filename);
+        
+        chrono::milliseconds span(60000);
+        
+        while((fut.wait_for(span)==future_status::timeout) || input.is_open())
+        {
+        }
+
+        if(input.is_open())
+        {
+                input.close();
+        }
+	
+	long double total = fut.get();
+
+	tuple<int, int> tempx;
+	tuple<int, int> tempy;
+
+	long int temp;
+
+	for(long int i : relaxed_edges)
+	{
+		tempx = points.at(temp);
+		tempy = points.at(i);
+		cout << get<0>(tempx) << "\t" << get<1>(tempx) << "\t" << get<0>(tempy) << "\t" << get<1>(tempy) << endl;
+		temp = i;
+	}
+
+	cout << total << endl;
+
+        return 0;
+}
diff --git a/hw1/hw1pr2/hw1pr2.cpp b/hw1/hw1pr2/hw1pr2.cpp
new file mode 100644
index 0000000..d40bf74
--- /dev/null
+++ b/hw1/hw1pr2/hw1pr2.cpp
@@ -0,0 +1,335 @@
+// Alexander Huddleston 223000555
+// CSCE420
+// Due: October 2, 2017 (changed to 4)
+// hw1pr2.cpp
+
+// Purpose: Read a file of points, compute interative best-first of a closed path between points.
+
+#include<stdio.h>
+#include<iostream>
+#include<fstream>
+#include<cmath>
+#include<future>
+#include<chrono>
+#include<vector>
+#include<climits>
+#include<unordered_set>
+#include<algorithm>
+
+using namespace std;
+
+// Double vector used to store list of squared distances between points.
+vector<vector<long int>> dmat;
+
+// Used to store the points from file.
+vector<tuple<int, int>> points;
+
+// Used to store the paths each iteration has traveled.
+vector<unordered_set<long int>> relaxed_edges;
+
+// Used to store the distance values of the respective paths.
+vector<long int> shortest_paths;
+
+void store_points(ifstream *input, string filename)
+{
+        input->open(filename);
+
+        string line = "";
+
+	string token = "";
+
+	tuple<int, int> temp_point;
+	get<0>(temp_point) = 0.0;
+	get<1>(temp_point) = 0.0;
+
+        while(getline(*input, line))
+        {
+                for(char c : line)
+		{
+			if(c == ' ')
+			{
+				get<0>(temp_point) = stof(token);
+				token = "";
+			}
+			else
+			{
+				token = token + c;
+			}
+		}
+
+		get<1>(temp_point) = stof(token);
+
+		token = "";
+
+		points.push_back(temp_point);
+        }
+
+	input->close();
+}
+
+void store_distances()
+{
+	long int d1 = 0.0;
+	long int d2 = 0.0;
+
+	tuple< int,  int> x;
+	tuple< int,  int> y;
+	get<0>(x) = 0.0;
+	get<1>(x) = 0.0;
+	get<0>(y) = 0.0;
+	get<1>(y) = 0.0;
+
+	vector<long int> tempvec;
+
+	for(int r = points.size() - 1; r >= 0; --r)
+	{
+		for(int c = 0; c < points.size() - (points.size() - r); ++c)
+		{
+			x = points.at(r);
+			y = points.at(c);
+
+			d1 = (get<0>(x) - get<0>(y));
+			d2 = (get<1>(x) - get<1>(y));
+
+			tempvec.push_back(d1*d1 + d2*d2);
+		}
+
+		dmat.push_back(tempvec);
+		tempvec.clear();
+	}
+}
+
+bool tuple_sort(tuple<long int, long int> t1, tuple<long int, long int> t2)
+{
+	return (get<1>(t1) < get<1>(t2));
+}
+
+tuple<vector<int>, long double> iterate_path(int p)
+{
+	// Find best-first shortest path for this iteration.
+
+	// Small optomization so we don't have to call points.size() so much.
+	long int n = points.size();
+
+	// In this variation, I want to keep track of the 4 closest points to root.
+	vector<int> closest;
+	vector<tuple<long int, long int>> first;
+	long int temp_counter = n - 1;
+	if(dmat.at(p).size() > 0)
+	{
+		for(long int b : dmat.at(p))
+		{
+
+			tuple<long int, long int> t (temp_counter, b);
+			first.push_back(t);
+			--temp_counter;
+		}
+	}
+	for(int a = 0; a < (temp_counter); ++a)
+	{
+		tuple<long int, long int> t ((temp_counter - a), (dmat.at(a).at((n - 1) - p)));
+		first.push_back(t);
+	}
+	sort(first.begin(), first.end(), tuple_sort);
+
+	temp_counter = 0;
+	for(tuple<long int, long int> te : first)
+	{
+		if(temp_counter > 3)
+		{
+			break;
+		}
+		closest.push_back(get<0>(te));
+		++temp_counter;
+	}
+
+	// Store distance up to this point.
+	long double current_distance = 0;
+
+	// Using this to keep track of selected node.
+	long int current_node = 0;
+
+	long int selected_node = 0;
+
+	// Using this to keep track of min distance.
+	long int min_distance = 0;
+	
+	while(relaxed_edges.at(p).size() < (n - 1))
+	{
+		min_distance = INT_MAX;
+		for(int i = 0; i < (n - 1); ++i)
+		{
+			while(relaxed_edges.at(p).find(i) != relaxed_edges.at(p).end())
+			{
+				++i;
+				if(i == current_node)
+				{
+					++i;
+				}
+			}
+			if(i > (n - 1))
+			{
+				break;
+			}
+
+			if(i < current_node)
+			{
+				if(min_distance > dmat.at(i).at((n - 1) - current_node))
+				{
+					selected_node = ((n - 1) - i);
+					min_distance = dmat.at(i).at((n - 1) - current_node);
+				}
+			}
+			else
+			{
+				if(i == current_node)
+				{
+					++i;
+					if(i > (n - 1))
+					{
+						break;
+					}
+				}
+				if(min_distance > dmat.at(current_node).at((n - 1) - i))
+				{
+					selected_node = ((n - 1) - i);
+					min_distance = dmat.at(current_node).at((n - 1) - i);
+				}
+			}
+		}
+
+		relaxed_edges.at(p).insert((n - 1) - current_node);
+		current_node = selected_node;
+		current_distance += sqrt(min_distance);
+	}
+
+	current_distance += sqrt(dmat.at(current_node).at(0));
+	
+	tuple<vector<int>, long double> output;
+
+	get<0>(output) = closest;
+	get<1>(output) = current_distance;
+
+	return output;
+}
+
+long double best_first(ifstream *input, string filename)
+{
+	// First, store the points from the file into global vector.
+        store_points(input, filename);
+
+	// Store squared distances into dmat.
+	// Ignore duplicate distances, 0 vectors.
+	store_distances();
+
+	// This is how we know depth.
+	long int depth = 1;
+
+	// Which node iteration are we on?
+	int n = 0;
+
+	unordered_set<long int> empty;
+	relaxed_edges.push_back(empty);
+
+	while(depth < points.size() - 1)
+	{
+		// Find shortest path with given path.
+		tuple<vector<int>, long double> ip = iterate_path(n);
+		shortest_paths.push_back(get<1>(ip));
+		vector<int> closest = get<0>(ip);
+
+		unordered_set<long int> one;
+		unordered_set<long int> two;
+		unordered_set<long int> three;
+		unordered_set<long int> four;
+
+		long int temp = 0;
+
+		for(long int i : relaxed_edges.at(n))
+		{
+			++temp;
+			one.insert(i);
+			two.insert(i);
+			three.insert(i);
+			four.insert(i);
+			if(temp == depth)
+			{
+				if(closest.size() > 0)
+				{
+					one.insert(closest.at(0));
+				}
+				if(closest.size() > 1)
+				{
+					two.insert(closest.at(1));
+				}
+				if(closest.size() > 2)
+				{
+					three.insert(closest.at(2));
+				}
+				if(closest.size() > 3)
+				{
+					four.insert(closest.at(3));
+				}
+				break;
+			}
+		}
+
+		relaxed_edges.push_back(one);
+		relaxed_edges.push_back(two);
+		relaxed_edges.push_back(three);
+		relaxed_edges.push_back(four);
+
+		if(n <= 1)
+		{
+			depth = 2;
+		}
+		else
+		{
+			depth = 2 + ((int)(log(n + 1)/log(4)));
+		}
+
+		++n;
+	}
+
+	return shortest_paths.at(0);
+}
+
+int main()
+{
+        ifstream input;
+        
+        string filename = "hw1pr2_data.txt";
+        
+        future<long double> fut = async(best_first, &input, filename);
+        
+        chrono::milliseconds span(60000);
+        
+        while((fut.wait_for(span)==future_status::timeout) || input.is_open())
+        {
+        }
+
+        if(input.is_open())
+        {
+                input.close();
+        }
+	
+	long double total = fut.get();
+
+	tuple<int, int> tempx;
+	tuple<int, int> tempy;
+
+	long int temp = 0;
+
+	// Change 0 to shortest path.
+	for(long int i : relaxed_edges.at(0))
+	{
+		tempx = points.at(temp);
+		tempy = points.at(i);
+		cout << get<0>(tempx) << "\t" << get<1>(tempx) << "\t" << get<0>(tempy) << "\t" << get<1>(tempy) << endl;
+		temp = i;
+	}
+
+	cout << total << endl;
+
+        return 0;
+}
diff --git a/hw1/hw1pr2/hw1pr2_data.txt b/hw1/hw1pr2/hw1pr2_data.txt
new file mode 100644
index 0000000..558c77a
--- /dev/null
+++ b/hw1/hw1pr2/hw1pr2_data.txt
@@ -0,0 +1,4 @@
+0 0
+0 1
+1 1
+1 2
diff --git a/hw1/hw1pr2/makefile b/hw1/hw1pr2/makefile
new file mode 100644
index 0000000..d7ca9fa
--- /dev/null
+++ b/hw1/hw1pr2/makefile
@@ -0,0 +1,5 @@
+all: main.o
+main.o: hw1pr2.cpp
+	g++ -std=c++17 -lpthread hw1pr2.cpp -o hw1pr2
+clean:
+	rm -rf *.o hw1pr2
diff --git a/hw1/hw1pr2_data.txt b/hw1/hw1pr2_data.txt
new file mode 100644
index 0000000..558c77a
--- /dev/null
+++ b/hw1/hw1pr2_data.txt
@@ -0,0 +1,4 @@
+0 0
+0 1
+1 1
+1 2
diff --git a/hw1/hw1pr3/hw1pr3.cpp b/hw1/hw1pr3/hw1pr3.cpp
new file mode 100644
index 0000000..295a73b
--- /dev/null
+++ b/hw1/hw1pr3/hw1pr3.cpp
@@ -0,0 +1,317 @@
+// Alexander Huddleston 223000555
+// CSCE420
+// Due: October 2, 2017 (changed to 4)
+// hw1pr3.cpp
+
+// Purpose: A breadth-first search program solving a 15-puzzle problem.
+
+#include<iostream>
+#include<vector>
+#include<queue>
+
+using namespace std;
+
+// I could move this into a separate header file, due to time
+// constrains I am keeping it in main for now.
+class GameBoard
+{
+	private:
+		// A string representing the state of the board.
+		string state = "";
+		// Which index the blank tile is at.
+		int blank = 0;
+		// List of game moves so far.
+		vector<string> moves;
+	public:
+		// Should only be used at the beginning to set initial state.
+		void setBoardState(string s)
+		{
+			state = s;
+			blank = s.find('a');
+		}
+		// Return the current board state.
+		string getBoardState()
+		{
+			return state;
+		}
+		// Return the vector of move strings.
+		vector<string> getMoves()
+		{
+			return moves;
+		}
+		// Change board state, make move. Not necessarily in that order.
+		void swap(char c)
+		{
+			char temp = 'p';
+			switch(c)
+			{
+				case 'l':
+					temp = state[blank - 1];
+					state[blank - 1] = 'a';
+					state[blank] = temp;
+					blank = --blank;
+					break;
+				case 'r':
+					temp = state[blank + 1];
+					state[blank + 1] = 'a';
+					state[blank] = temp;
+					blank = ++blank;
+					break;
+				case 'u':
+					temp = state[blank - 4];
+					state[blank - 4] = 'a';
+					state[blank] = temp;
+					blank = blank - 4;
+					break;
+				case 'd':
+					temp = state[blank + 4];
+					state[blank + 4] = 'a';
+					state[blank] = temp;
+					blank = blank + 4;
+					break;
+				default:
+					break;
+			}
+			// Debugging
+			//print_move(c, state);
+			moves.push_back(c + state);
+		}
+		// Check if a move is legal.
+		bool isLegal(char c)
+		{
+			if(c == 'l')
+			{
+				return ((blank % 4) > 0);
+			}
+			if(c == 'r')
+			{
+				return ((blank % 4) < 3);
+			}
+			if(c == 'u')
+			{
+				return (blank > 3);
+			}
+			if(c == 'd')
+			{
+				return (blank < 12);
+			}
+		}
+		// Check if we have solved the puzzle
+		bool isSolved(string s)
+		{
+			if(moves.size() > 0)
+			{
+				return !(moves[moves.size() - 1].substr(1).compare(s));
+			}
+			else
+			{
+				return !(state.compare(s));
+			}
+		}
+		// Useful if we want the previous board state back.
+		void resetLastMove()
+		{
+			if(moves.size() > 0)
+			{
+				moves.pop_back();
+				moves.pop_back();
+			}
+			else
+			{
+				cerr << "Nothing to reset." << endl;
+			}
+		}
+} gb;
+
+// Global GameBoard queue.
+queue<GameBoard> gbq;
+
+string get_input_game_board()
+{
+	string input = "";
+	getline(cin, input);
+	string output = "";
+
+	string token = "";
+
+	for(char c : input)
+	{
+		if(c == ',')
+		{
+			output += (char)(stoi(token) + 97);
+			token = "";
+			continue;
+		}
+		else
+		{
+			token += c;
+		}
+	}
+	output += (char)(stoi(token) + 97);
+
+	return output;
+}
+
+void print_move(char m, string gb)
+{
+	string move = "";
+	switch(m)
+	{
+		case 'l':
+			move = "Left";
+			break;
+		case 'r':
+			move = "Right";
+			break;
+		case 'u':
+			move = "Up";
+			break;
+		case 'd':
+			move = "Down";
+			break;
+		default:
+			move = "Start";
+			break;
+	}
+
+	for(int x = 0; x < 16; ++x)
+	{
+		if(x == 0)
+		{
+			cout << "\t" << move << "\t";
+		}
+		else if(x % 4 == 0)
+		{
+			cout << "\n\t\t";
+		}
+
+		if(((int)gb[x]) - 97 < 10)
+		{
+			cout << ((int)gb[x] - 97) << "  ";
+		}
+		else
+		{
+			cout << ((int)gb[x] - 97) << " ";
+		}
+	}
+	if(m == 's')
+	{
+		cout << "\nSwap the blank\n";
+	}
+	else
+	{
+		cout << "\n\n";
+	}
+}
+
+GameBoard solve_game(GameBoard gb, string solved)
+{
+	gbq.pop();
+	if(gb.isSolved(solved))
+	{
+		return gb;
+	}
+	if(gb.isLegal('l'))
+	{
+		gb.swap('l');
+		gbq.push(gb);
+		if(gb.isSolved(solved))
+		{
+			return gb;
+		}
+		else
+		{
+			gb.swap('r');
+			gb.resetLastMove();
+		}
+	}
+	if(gb.isLegal('r'))
+	{
+		gb.swap('r');
+		gbq.push(gb);
+		if(gb.isSolved(solved))
+		{
+			return gb;
+		}
+		else
+		{
+			gb.swap('l');
+			gb.resetLastMove();
+		}
+	}
+	if(gb.isLegal('u'))
+	{
+		gb.swap('u');
+		gbq.push(gb);
+		if(gb.isSolved(solved))
+		{
+			return gb;
+		}
+		else
+		{
+			gb.swap('d');
+			gb.resetLastMove();
+		}
+	}
+	if(gb.isLegal('d'))
+	{
+		gb.swap('d');
+		gbq.push(gb);
+		if(gb.isSolved(solved))
+		{
+			return gb;
+		}
+		else
+		{
+			gb.swap('u');
+			gb.resetLastMove();
+		}
+	}
+	return solve_game(gbq.front(), solved);
+}
+
+int main()
+{
+	// Initializing with simple test case just in case something goes wrong.
+	string solved = "bcdefghijklmnopa";
+	string init = "bcdefghijkalnopm";
+
+	// Getting input.
+	cout << "Enter 15-puzzle starting state by rows (0 for blank):" << endl;
+	init = get_input_game_board();
+	
+	cout << "Enter ending state by rows (0 for blank):" << endl;
+	solved = get_input_game_board();
+
+	//  Push starting board into queue, start recursion.
+	gb.setBoardState(init);
+	gbq.push(gb);
+	gb = solve_game(gbq.front(), solved);
+
+	// Print the solution.
+	cout << "Solution:" << endl;
+	print_move('s', init);
+
+	if(gb.getMoves().size() > 0)
+	{
+		for(string m : gb.getMoves())
+		{
+			char c = m[0];
+			string state = m.substr(1);
+			print_move(c, state);
+		}
+	}
+
+	// I added various pieces of code to help the program
+	// if the user decides to put in an already solved puzzle.
+	if(gb.getMoves().size() > 0)
+	{
+		cout << "Done!\tGenerated " << gb.getMoves().size() << " states." << endl;
+	}
+	else
+	{
+		cout << "You gave me a solved puzzle." << endl;
+	}
+
+	return 0;
+}
diff --git a/hw1/hw1pr3/makefile b/hw1/hw1pr3/makefile
new file mode 100644
index 0000000..546a813
--- /dev/null
+++ b/hw1/hw1pr3/makefile
@@ -0,0 +1,5 @@
+all: main.o
+main.o: hw1pr3.cpp
+	g++ -std=c++17 hw1pr3.cpp -o hw1pr3
+clean:
+	rm -rf *.o hw1pr3
diff --git a/hw2/420hw2-17fall.txt b/hw2/420hw2-17fall.txt
new file mode 100644
index 0000000..8a82ba6
--- /dev/null
+++ b/hw2/420hw2-17fall.txt
@@ -0,0 +1,110 @@
+(Print this page as a cover sheet for your printouts)
+
+CSCE 420 HOMEWORK 2
+Dr. Daugherity
+Due: 11:59 P.M. Monday, October 30, 2017
+
+"On my honor, as an Aggie, I have neither given nor received any unauthorized 
+aid on any portion of the academic work included in this assignment."
+
+
+________________________________	________________________________
+Typed or printed name of student	           Signature of student
+
+NOTE:  Please follow your lab instructor's directions for submitting your 
+assignment through CSNET.  ONLY ASSIGNMENTS SUBMITTED TO CSNET WILL BE GRADED!
+Make a printout of each source file and staple it behind this cover sheet.
+Sign it and turn it in in class Tuesday.  IF YOU DO NOT TURN IN A SIGNED COVER 
+SHEET YOUR WORK WILL NOT BE GRADED!
+
+NOTE:  Homework will be graded on build.tamu.edu, using g++ 7.2.0 with 
+-std=c++17, or javac and java, or python3.
+
+You are free to develop your programs on any other platform, but it is your 
+responsibility to make sure your programs also compile and execute correctly on
+build.tamu.edu as specified.
+
+NOTE:  Each file submitted (hw2pr1.cpp, etc.--see below) must begin as follows:
+//Your name and UIN
+//CSCE 420
+//Due: Ocotber 2, 2017
+//hw2pr1.cpp (or whatever this file name is)
+
+NOTE:  Also write a README.txt file with whatever information is needed to
+compile and run your programs.  Zip the README.txt and the homework files into
+a single file named hw2.zip and submit to CSNET.
+
+The grade for this lab will be based on style (formatting, variable names, 
+comments, etc.), syntax (no compilation or link errors), and correctness 
+(passes all test cases).  Your grade for this lab is:
+Problem #	 1       2       3       4 
+Style             /2      /4      /4      /2 
+Syntax            /3      /6      /6      /3 
+Correctness       /5      /10     /10     /5
+-------------------------------------------------------------------
+Total             /10     /20     /20     /10
+Grand total _____/50
+
+1. (10 points) Code the mutually-recursive max_value and min_value functions
+specified in Figure 5.3 and use them to find the max (root's value) 
+of a tree read in from the keyboard as a nested list.  For example, the tree in Figure 5.2 would be input as
+	((3,12,8),(2,4,6),(14,5,2))
+Name your program hw2pr1.cpp, etc.
+
+2. (20 points) Modify problem 1 to do both alpha and beta pruning according to
+Figure 5.7 and print a message "alpha pruning" or "beta pruning" each time that
+occurs (in addition to the max of the tree).  For example, the tree
+	((3,8,(7,(3,0,7),(8,8,2))),
+	 (4,(7,9,8),8),
+	 (((3,6,4),2,6),((9,2,9),4,7,(6,4,5) ),4,(6,4,5))
+	)
+would print "alpha pruning" 3 times and "beta pruning" 3 times.
+Name your program hw2pr2.cpp, etc.
+
+3. (20 points) Write a Horn clause inference engine which accepts a filename
+from the user, reads Horn clauses from that file, and then makes all possible 
+deductions using forward chaining.  The format of the input file will be one 
+Horn clause per line in PROLOG notation (see section 9.4.2).  For example, if
+the data file contains
+
+	B:-A.
+	D:-B,C.
+	A.
+	C.
+
+then the program will deduce B and D are true.  For another test file use
+Fig. 7.15.  
+
+Name your program hw2pr3.cpp etc.  Hint: Fig. 7.14 gives the pseudocode.
+
+OPTIONAL EXTRA CREDIT 
+=====================
+4. (10 points) Write a backtracking prover based on the DPLL_satisfiable
+function in Fig. 7.17 which first reads Horn clauses as in the example from
+problem 3, then a query preceded by a question mark (that is, what you are
+asking to be proven).
+
+	B:-A.
+	D:-B,C.
+	A.
+	C.
+	?D
+
+To prove D is equivalent to saying the Horn clauses entail (imply) D.  Since an
+implication is only false if the "if" side is true and the "then" side is false,
+we add "not D" to the list of Horn clauses and call DPLL_satisfiable.  If it
+returns false, that means "not not D" must be true, which is D, which is what
+we were trying to prove, so output "Proven!"  If the query had been E then
+adding "not E" and calling DPLL_satisfiable would result in true, so output
+"Cannot prove."
+
+Hint: In PROLOG notation "not D" can be written
+	:-D.
+Since the "then" side can always be or'ed with false, this is equivalent to
+	D --> false
+which is equivalent to "not D."  Another way of thinking about it is that the
+"then" side of a Horn clause is false or'ed with whatever terms are there (in
+this case none).
+
+Name your program hw2pr4.cpp etc.
+