DetermineColorOfAChessboardSquare.cpp

// Source : https://leetcode.com/problems/determine-color-of-a-chessboard-square/
// Author : Hao Chen
// Date   : 2021-04-06

/***************************************************************************************************** 
 *
 * You are given coordinates, a string that represents the coordinates of a square of the chessboard. 
 * Below is a chessboard for your reference.
 * 
 * Return true if the square is white, and false if the square is black.
 * 
 * The coordinate will always represent a valid chessboard square. The coordinate will always have the 
 * letter first, and the number second.
 * 
 * Example 1:
 * 
 * Input: coordinates = "a1"
 * Output: false
 * Explanation: From the chessboard above, the square with coordinates "a1" is black, so return false.
 * 
 * Example 2:
 * 
 * Input: coordinates = "h3"
 * Output: true
 * Explanation: From the chessboard above, the square with coordinates "h3" is white, so return true.
 * 
 * Example 3:
 * 
 * Input: coordinates = "c7"
 * Output: false
 * 
 * Constraints:
 * 
 * 	coordinates.length == 2
 * 	'a' <= coordinates[0] <= 'h'
 * 	'1' <= coordinates[1] <= '8'
 ******************************************************************************************************/

class Solution {
public:
    bool squareIsWhite(string coordinates) {
        return (coordinates[0] - 'a'+1) % 2 != (coordinates[1] - '0') % 2;
    }
};