add Rotate Image solution

Author: HoonDongKang

rotate-image/HoonDongKang.ts

@@ -0,0 +1,22 @@
+/**
+ * [Problem]: [48] Rotate Image
+ * (https://leetcode.com/problems/rotate-image/)
+ */
+/**
+ Do not return anything, modify matrix in-place instead.
+ */
+// 시간복잡도 O(n^2)
+// 공간복잡도 O(1)
+function rotate(matrix: number[][]): void {
+    const length = matrix.length;
+
+    for (let i = 0; i < length; i++) {
+        for (let j = i + 1; j < length; j++) {
+            [matrix[i][j], matrix[j][i]] = [matrix[j][i], matrix[i][j]];
+        }
+    }
+
+    for (let i = 0; i < length; i++) {
+        matrix[i].reverse();
+    }
+}