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.

ex1

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 boolean squareIsWhite(String coordinates) {
        int col = coordinates.charAt(0) - 'a';
        int row = coordinates.charAt(1) - '1';
        
        System.out.println(col + " " + row);
        
        if (col % 2 == 0) {
            if (row % 2 != 0) {
                return true; // white
            } else {
                return false;
            }
        } else {
            // h3
            if (row % 2 == 0) {
                return true; // white
            } else {
                return false;
            }
        }
    }
}

Solution#

Solution