Problem 2 Finished.

hw2/hw2pr1/.hw2pr1_data.txt

@@ -1 +1 @@
-((3,12,8),(2,4,6),(14,5,2))
+((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)))

hw2/hw2pr1/hw2pr1.cpp

@@ -16,6 +16,7 @@ using namespace std;
 // Perform min/max on this tree.
 void minmax(node *n)
 {
+
     if(n->getLevel() % 2 == 0)
     {
         int max = n->getValue();
@@ -23,16 +24,32 @@ void minmax(node *n)
         {
             for(int c = 0; c < n->getChildren().size(); c++)
             {
-                minmax(n->getChildAt(c));
+        	n->getChildAt(c)->setBeta(n->getBeta());
+        	n->getChildAt(c)->setAlpha(n->getAlpha());
+		
+		cout << "Alpha: " << n->getAlpha() << " Beta: " << n->getBeta() << endl;
+                
+		minmax(n->getChildAt(c));
 
                 if(n->getChildAt(c)->getValue() > max)
                 {
                     max = n->getChildAt(c)->getValue();
                 }
+
+		if(n->getChildAt(c)->getValue() > n->getAlpha())
+		{
+		    n->setAlpha(n->getChildAt(c)->getValue());
+		}
+
+		if(n->getAlpha() >= n->getBeta())
+		{
+		    cout << "Beta pruning" << endl;
+		    break;
+		}
             }
         }
         n->setValue(max);
-        cout << n->getValue() << endl;
+        //cout << n->getValue() << endl;
     }
 
     else
@@ -42,16 +59,32 @@ void minmax(node *n)
         {
             for(int c = 0; c < n->getChildren().size(); c++)
             {
-                minmax(n->getChildAt(c));
+        	n->getChildAt(c)->setBeta(n->getBeta());
+        	n->getChildAt(c)->setAlpha(n->getAlpha());
+		
+		cout << "Alpha: " << n->getAlpha() << " Beta: " << n->getBeta() << endl;
+                
+		minmax(n->getChildAt(c));
                 
                 if(n->getChildAt(c)->getValue() < min)
                 {
                     min = n->getChildAt(c)->getValue();
                 }
+
+		if(n->getChildAt(c)->getValue() < n->getBeta())
+		{
+		    n->setBeta(n->getChildAt(c)->getValue());
+		}
+		
+		if(n->getBeta() <= n->getAlpha())
+		{
+		    cout << "Alpha pruning." << endl;
+		    break;
+		}
             }
         }
         n->setValue(min);
-        cout << n->getValue() << endl;
+        //cout << n->getValue() << endl;
     }
 }
 
@@ -73,6 +106,7 @@ void printTree(node n)
 
 tuple<node, string> makeTree(string input, node n, int level)
 {
+    bool negate = false;
     char tempc;
     string tempn = "";
 
@@ -88,12 +122,16 @@ tuple<node, string> makeTree(string input, node n, int level)
             input = "";
         }
 
-        cout << "testing" << endl;
         // If the char is a number.
         if(isdigit(tempc))
         {
             tempn += tempc;
         }
+
+	else if(tempc == '-')
+	{
+	    negate = true;
+	}
         
         // If the char is a comma.
         else if(tempc == ',')
@@ -102,10 +140,16 @@ tuple<node, string> makeTree(string input, node n, int level)
             {
                 node tempnode;
                 tempnode.setLevel(level);
-                tempnode.setValue(stoi(tempn));
+		int negatemp = stoi(tempn);
+		if(negate)
+		{
+		    negatemp = -negatemp;
+		}
+                tempnode.setValue(negatemp);
                 tempnode.setParent(&n);
                 n.addChild(tempnode);
                 tempn = "";
+		negate = false;
             }
         }
 
@@ -116,10 +160,16 @@ tuple<node, string> makeTree(string input, node n, int level)
             {
                 node tempnode;
                 tempnode.setLevel(level);
-                tempnode.setValue(stoi(tempn));
+		int negatemp = stoi(tempn);
+		if(negate)
+		{
+		    negatemp = -negatemp;
+		}
+                tempnode.setValue(negatemp);
                 tempnode.setParent(&n);
                 n.addChild(tempnode);
                 tempn = "";
+		negate = false;
             }
             tuple<node, string> tempt(n, input);
             return tempt;
@@ -192,6 +242,7 @@ int main(int argc, char **argv)
     tree = makeTree(input.substr(1), root, 1);
     root = get<0>(tree);
 
+    printTree(root);
     minmax(&root);
 
     printTree(root);

hw2/hw2pr1/hw2pr1_data.txt

@@ -1 +1 @@
-((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)))
+(((-2,-11,10),(2,15,13),(-1,-16,-16)),((-20,13,20),(-13,7,-19),(7,3,4)),((-20,-9,-14),(-4,-6,-12),(11,18,-3)))

hw2/hw2pr1/node.cpp

@@ -7,6 +7,8 @@ node::node()
     parent = NULL;
     level = 0;
     value = 0;
+    alpha = INT_MIN;
+    beta = INT_MAX;
 }
 
 node::node(node* n)
@@ -15,5 +17,7 @@ node::node(node* n)
     level = n->getLevel();
     value = n->getValue();
     children = n->getChildren();
+    alpha = n->getAlpha();
+    beta = n->getBeta();
 }
 

hw2/hw2pr1/node.h

@@ -2,6 +2,7 @@
 #define NODE_H
 
 #include <vector>
+#include <limits.h>
 
 using namespace std;
 
@@ -12,6 +13,8 @@ class node
         int level;
         int value;
         vector<node> children;
+	int alpha;
+	int beta;
     public:
         node();
         node(node *n);
@@ -25,6 +28,10 @@ class node
         void addChild(node n) { children.push_back(n); };
         vector<node> getChildren() { return children; };
         node* getChildAt(int i) { return &children.at(i); };
+	void setAlpha(int a) { alpha = a; };
+	int getAlpha() { return alpha; };
+	void setBeta(int b) { beta = b; };
+	int getBeta() { return beta; };
 };
 
 #endif