using counters to decide state of tic tac toe

Author: Arjiit

Design/ticTacToeCounter.java

@@ -0,0 +1,105 @@
+class TicTacToe {
+
+    /** Initialize your data structure here. */
+    private int[][] board;
+    int[] rowCounter;
+    int[] colCounter;
+    int diagLeft;
+    int diagRight;
+    int n;
+    public TicTacToe(int n) {
+        board = new int[n][n];
+        rowCounter = new int[n];
+        colCounter = new int[n];
+        diagLeft = 0;
+        diagRight = 0;
+        this.n = n;
+    }
+    
+    /** Player {player} makes a move at ({row}, {col}).
+        @param row The row of the board.
+        @param col The column of the board.
+        @param player The player, can be either 1 or 2.
+        @return The current winning condition, can be either:
+                0: No one wins.
+                1: Player 1 wins.
+                2: Player 2 wins. */
+    public int move(int row, int col, int player) {
+        int move = player == 1 ? -1 : 1;
+        rowCounter[row] = rowCounter[row] + move;
+        colCounter[col] = colCounter[col] + move;
+        
+        if(row == col) {
+            diagLeft = diagLeft + move;
+        }
+        
+        if (row == n - col - 1) {
+            diagRight = diagRight + move;
+        }
+        if (rowCounter[row] == n || colCounter[col] == n || diagLeft == n || diagRight == n) {
+            return 2;
+        } else if (rowCounter[row] == -n || colCounter[col] == -n || diagLeft == -n || diagRight == -n) {
+            return 1;
+        } else {
+            return 0;
+        }
+    }
+}
+
+/**
+ * Your TicTacToe object will be instantiated and called as such:
+ * TicTacToe obj = new TicTacToe(n);
+ * int param_1 = obj.move(row,col,player);
+ */class TicTacToe {
+
+    /** Initialize your data structure here. */
+    private int[][] board;
+    int[] rowCounter;
+    int[] colCounter;
+    int diagLeft;
+    int diagRight;
+    int n;
+    public TicTacToe(int n) {
+        board = new int[n][n];
+        rowCounter = new int[n];
+        colCounter = new int[n];
+        diagLeft = 0;
+        diagRight = 0;
+        this.n = n;
+    }
+    
+    /** Player {player} makes a move at ({row}, {col}).
+        @param row The row of the board.
+        @param col The column of the board.
+        @param player The player, can be either 1 or 2.
+        @return The current winning condition, can be either:
+                0: No one wins.
+                1: Player 1 wins.
+                2: Player 2 wins. */
+    public int move(int row, int col, int player) {
+        int move = player == 1 ? -1 : 1;
+        rowCounter[row] = rowCounter[row] + move;
+        colCounter[col] = colCounter[col] + move;
+        
+        if(row == col) {
+            diagLeft = diagLeft + move;
+        }
+        
+        if (row == n - col - 1) {
+            diagRight = diagRight + move;
+        }
+        if (rowCounter[row] == n || colCounter[col] == n || diagLeft == n || diagRight == n) {
+            return 2;
+        } else if (rowCounter[row] == -n || colCounter[col] == -n || diagLeft == -n || diagRight == -n) {
+            return 1;
+        } else {
+            return 0;
+        }
+    }
+}
+
+/**
+ * Your TicTacToe object will be instantiated and called as such:
+ * TicTacToe obj = new TicTacToe(n);
+ * int param_1 = obj.move(row,col,player);
+ */