1 public class TicTacToe { 2     private int[] rows; 3     private int[] cols; 4     private int diag; 5     private int antidiag; 6     private int n; 7     /** Initialize your data structure here. */ 8     public TicTacToe(int n) { 9         this.n = n;10         rows = new int[n];11         cols = new int[n];12         diag = 0;13         antidiag = 0;14     }15     16     /** Player {player} makes a move at ({row}, {col}).17         @param row The row of the board.18         @param col The column of the board.19         @param player The player, can be either 1 or 2.20         @return The current winning condition, can be either:21                 0: No one wins.22                 1: Player 1 wins.23                 2: Player 2 wins. */24     public int move(int row, int col, int player) {25         int toAdd = player == 1 ? 1 : -1;26         rows[row] += toAdd;27         cols[col] += toAdd;28         diag += row == col ? toAdd : 0;29         antidiag += row == (n - col - 1) ? toAdd : 0;30         31         if (Math.abs(rows[row]) == n ||32             Math.abs(cols[col]) == n ||33             Math.abs(diag) == n ||34             Math.abs(antidiag) == n) {35                 return player;36             }37         return 0;38     }39 }40 41 /**42  * Your TicTacToe object will be instantiated and called as such:43  * TicTacToe obj = new TicTacToe(n);44  * int param_1 = obj.move(row,col,player);45  */

1. One thing need to be notice that if player put to wrong place...