LeetCode 1812. Determine Color of a Chessboard Square

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'

Solution

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