carloscn / structstudy

Leetcode daily trainning by using C/C++/RUST programming.
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leetcode1812: Determine Color of a Chessboard Square #289

Open carloscn opened 1 year ago

carloscn commented 1 year ago

Description

You are given coordinates, a string that represents the coordinates of a square of the chessboard. Below is a chessboard for your reference.

image

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'

carloscn commented 1 year ago

Analysis

pub fn square_is_white(coordinates: &str) -> bool
{
    if coordinates.len() < 1 {
        return false;
    }

    let rcv:Vec<char> = coordinates.chars().collect();

    if rcv[0] as u8 + 1 & 0x1 == 1 ||
       rcv[1] as u8 + 1 & 0x1 == 1 {
        return true;
    }

    return false;
}
carloscn commented 1 year ago

code

https://review.gerrithub.io/c/carloscn/structstudy/+/557026 https://github.com/carloscn/structstudy/commit/ab9f3681ae32a7fd0f2415d00b35673cdc7f4865