1812. Determine Color of a Chessboard Square: AC

src/solution/mod.rs

@@ -1364,3 +1364,4 @@ mod s1805_number_of_different_integers_in_a_string;
 mod s1806_minimum_number_of_operations_to_reinitialize_a_permutation;
 mod s1807_evaluate_the_bracket_pairs_of_a_string;
 mod s1808_maximize_number_of_nice_divisors;
+mod s1812_determine_color_of_a_chessboard_square;

src/solution/s1812_determine_color_of_a_chessboard_square.rs

@@ -0,0 +1,84 @@
+/**
+ * [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.
+ * <img alt="" src="https://assets.leetcode.com/uploads/2021/02/19/screenshot-2021-02-20-at-22159-pm.png" style="width: 400px; height: 396px;" />
+ * 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'
+ *
+ */
+pub struct Solution {}
+
+// problem: https://leetcode.com/problems/determine-color-of-a-chessboard-square/
+// discuss: https://leetcode.com/problems/determine-color-of-a-chessboard-square/discuss/?currentPage=1&orderBy=most_votes&query=
+
+// submission codes start here
+
+impl Solution {
+    pub fn square_is_white(coordinates: String) -> bool {
+        coordinates
+            .as_bytes()
+            .into_iter()
+            .map(|c| c % 2)
+            .sum::<u8>()
+            == 1
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_1812_example_1() {
+        let coordinates = "a1".to_string();
+
+        let result = false;
+
+        assert_eq!(Solution::square_is_white(coordinates), result);
+    }
+
+    #[test]
+    fn test_1812_example_2() {
+        let coordinates = "h3".to_string();
+
+        let result = true;
+
+        assert_eq!(Solution::square_is_white(coordinates), result);
+    }
+
+    #[test]
+    fn test_1812_example_3() {
+        let coordinates = "c7".to_string();
+
+        let result = false;
+
+        assert_eq!(Solution::square_is_white(coordinates), result);
+    }
+}