20240502 Finished

src/problem/mod.rs

@@ -119,3 +119,4 @@ mod p30_substring_with_concatenation_of_all_words;
 mod p76_minimum_window_substring;
 mod p36_valid_sudoku;
 mod p54_spiral_matrix;
+mod p48_rotate_image;

src/problem/p48_rotate_image.rs

@@ -0,0 +1,42 @@
+/**
+ * [48] Rotate Image
+ */
+pub struct Solution {}
+
+
+// submission codes start here
+
+impl Solution {
+    pub fn rotate(matrix: &mut Vec<Vec<i32>>) {
+        let n = matrix.len();
+        
+        // 首先上下水平翻转
+        for i in (0..n / 2) {
+            for j in 0..n {
+                let t = matrix[i][j];
+                matrix[i][j] = matrix[n - i - 1][j];
+                matrix[n - i - 1][j] = t;
+            }
+        }
+
+        // 对角线翻转
+        for i in (0..n) {
+            for j in (0..i) {
+                let t = matrix[i][j];
+                matrix[i][j] = matrix[j][i];
+                matrix[j][i] = t;
+            }
+        }
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_48() {
+    }
+}