README_EN.md

1812. Determine Color of a Chessboard Square

中文文档

Description

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'

Solutions

Python3

class Solution:
    def squareIsWhite(self, coordinates: str) -> bool:
        x = ord(coordinates[0]) - ord('a') + 1
        y = int(coordinates[1])
        return ((x + y) & 1) == 1

Java

class Solution {
    public boolean squareIsWhite(String coordinates) {
        int x = coordinates.charAt(0) - 'a' + 1;
        int y = coordinates.charAt(1) - '0';
        return ((x + y) & 1) == 1;
    }
}

JavaScript

/**
 * @param {string} coordinates
 * @return {boolean}
 */
var squareIsWhite = function (coordinates) {
    let x = coordinates.charAt(0).charCodeAt() - "a".charCodeAt() + 1;
    let y = Number(coordinates.charAt(1));
    return ((x + y) & 1) == 1;
};

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