feat: rotate-image

Author: minji-go

rotate-image/minji-go.java

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+/**
+ * <a href="https://leetcode.com/problems/rotate-image/">week15-4. rotate-image</a>
+ * <li>Description: Given an n x n 2D matrix representing an image, rotate the image by 90 degrees</li>
+ * <li>Topics: Array, Math, Matrix</li>
+ * <li>Time Complexity: O(N²), Runtime 0ms      </li>
+ * <li>Space Complexity: O(1), Memory 42.11MB   </li>
+ */
+
+class Solution {
+    public void rotate(int[][] matrix) {
+        int n = matrix.length;
+
+        for (int i = 0; i < n / 2; i++) {
+            for (int j = i; j < n - 1 - i; j++) {
+                int temp = matrix[i][j];
+                matrix[i][j] = matrix[n - 1 - j][i];
+                matrix[n - 1 - j][i] = matrix[n - 1 - i][n - 1 - j];
+                matrix[n - 1 - i][n - 1 - j] = matrix[j][n - 1 - i];
+                matrix[j][n - 1 - i] = temp;
+            }
+        }
+    }
+}
+