348. Design Tic-Tac-Toe

class TicTacToe {

    int[] rows;
    int[] cols;
    int diag1;
    int diag2;
    int size;

    /** Initialize your data structure here. */
    public TicTacToe(int n) {
        rows = new int[n];
        cols = new int[n];
        diag1 = 0;
        diag2 = 0;
        size = 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 inc = player == 1 ? 1 : -1;
        rows[row] += inc;
        cols[col] += inc;

        if (row == col) {
            diag1 += inc;
        }

        if (row + col == size-1) {
            diag2 += inc;
        }

        if (Math.abs(rows[row]) == size || Math.abs(cols[col]) == size || Math.abs(diag1) == size || Math.abs(diag2) == size) {
            return player;
        }

        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);
 */