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'

1812. Determine Color of a Chessboard Square
struct Solution;

impl Solution {
    fn square_is_white(coordinates: String) -> bool {
        let mut arr: Vec<u8> = coordinates.bytes().collect();
        arr[0] -= b'a';
        arr[1] -= b'1';
        (arr[0] % 2 == 0) ^ (arr[1] % 2 == 0)
    }
}

#[test]
fn test() {
    let coordinates = "a1".to_string();
    let res = false;
    assert_eq!(Solution::square_is_white(coordinates), res);
    let coordinates = "h3".to_string();
    let res = true;
    assert_eq!(Solution::square_is_white(coordinates), res);
    let coordinates = "c7".to_string();
    let res = false;
    assert_eq!(Solution::square_is_white(coordinates), res);
}