done implementing minmax, only needs some better printing now

.vscode/settings.json

@@ -1,5 +1,6 @@
 {
   "files.associations": {
-    "iostream": "cpp"
+    "iostream": "cpp",
+    "ostream": "cpp"
   }
 }

ttt.cc

@@ -5,6 +5,10 @@
 
 using namespace std;
 
+int game_over(const int dimension, vector<vector<int>> &grid);
+int min(const int dimension, vector<vector<int>> &grid, int &x, int &y);
+int max(const int dimension, vector<vector<int>> &grid, int &x, int &y);
+
 void print_grid(const int dimension, vector<vector<int>> &grid) {
   for (int y = 0; y < dimension; y++) {
     for (int x = 0; x < 2 * dimension + 1; x++) {
@@ -34,10 +38,6 @@ void print_grid(const int dimension, vector<vector<int>> &grid) {
   }
 }
 
-int *minimax(const int dimension, vector<vector<int>> &grid) {
-  return 0;
-}
-
 int max(const int dimension, vector<vector<int>> &grid, int &x, int &y) {
   int n = game_over(dimension, grid);
   if (n == 2) return 0;
@@ -45,18 +45,53 @@ int max(const int dimension, vector<vector<int>> &grid, int &x, int &y) {
   else if (n == -1) return -1;
 
   int value = INT_MIN;
-  for (int y = 0; y < dimension; y++) {
+  for (int y_ = 0; y_ < dimension; y_++) {
-    for (int x = 0; x < dimension; x++) {
+    for (int x_ = 0; x_ < dimension; x_++) {
-      if (grid[y][x] != 0) continue;
+      if (grid[y_][x_] != 0) continue;
-      grid[y][x] = 1;
+      int old_x = x;
-      
+      int old_y = y;
+      grid[y_][x_] = 1;
+      int next_val = min(dimension, grid, x, y);
+      if (next_val > value) {
+        value = next_val;
+        x = x_;
+        y = y_;
+      } else {
+        x = old_x;
+        y = old_y;
+      }
+      grid[y_][x_] = 0;
     }
   }
+  return value;
 }
 
-void min(const int dimension, vector<vector<int>> &grid, int &x, int &y) {
+int min(const int dimension, vector<vector<int>> &grid, int &x, int &y) {
-  int value = INT_MAX;
+  int n = game_over(dimension, grid);
+  if (n == 2) return 0;
+  else if (n == 1) return 1;
+  else if (n == -1) return -1;
 
+  int value = INT_MAX;
+  for (int y_ = 0; y_ < dimension; y_++) {
+    for (int x_ = 0; x_ < dimension; x_++) {
+      if (grid[y_][x_] != 0) continue;
+      int old_x = x;
+      int old_y = y;
+      grid[y_][x_] = -1;
+      int next_val = max(dimension, grid, x, y);
+      if (next_val < value) {
+        value = next_val;
+        x = x_;
+        y = y_;
+      } else {
+        x = old_x;
+        y = old_y;
+      }
+      grid[y_][x_] = 0;
+    }
+  }
+  return value;
 }
 
 /*
@@ -89,10 +124,8 @@ int game_over(const int dimension, vector<vector<int>> &grid) {
       sum += grid[x][y];
     }
     if (sum == dimension) {
-      cout << "player won" << endl;
       return 1;
     } else if (sum == -dimension) {
-      cout << "bot won" << endl;
       return -1;
     }
     sum = 0;
@@ -104,10 +137,8 @@ int game_over(const int dimension, vector<vector<int>> &grid) {
     sum += grid[n][n];
   }
   if (sum == dimension) {
-    cout << "player won" << endl;
     return 1;
   } else if (sum == -dimension) {
-    cout << "bot won" << endl;
     return -1;
   }
 
@@ -117,10 +148,8 @@ int game_over(const int dimension, vector<vector<int>> &grid) {
     sum += grid[dimension - n][n - 1];
   }
   if (sum == dimension) {
-    cout << "player won" << endl;
     return 1;
   } else if (sum == -dimension) {
-    cout << "bot won" << endl;
     return -1;
   }
 
@@ -183,7 +212,11 @@ void player_move(const int dimension, vector<vector<int>> &grid) {
   grid[x][y] = 1;
 }
 
-void computer_move() {
+void computer_move(const int dimension, vector<vector<int>> &grid) {
+  int x;
+  int y;
+  min(dimension, grid, x, y);
+  grid[y][x] = -1;
 }
 
 
@@ -212,13 +245,13 @@ int play_game(const int dimension) {
 
   // Do move according to startPlayer
   if (startPlayer == 1) {
-    computer_move();
+    computer_move(dimension, grid);
   }
 
   while(true) {
     player_move(dimension, grid);
     if (game_over(dimension, grid) != 0) break;
-    computer_move();
+    computer_move(dimension, grid);
     if (game_over(dimension, grid) != 0) break;
   }