Merge pull request neetcode-gh#91 from vrindavan/main

48. Rotate Image Java Solution

Author: neetcode-gh

java/48-Rotate-Image.java

@@ -0,0 +1,34 @@
+//         Do note that this is for a sqaure matrix (NxN)
+//        The process is to first transpose the matrix and then reverse it
+//        Taking the first example: [[1,2,3],[4,5,6],[7,8,9]]
+//        After Transpose: [[1,4,7],[2,5,8],[3,6,9]]
+//        After Reversal: [[7,4,1],[8,5,2],[9,6,3]]
+
+class Solution {
+    public void rotate(int[][] matrix) {
+        int N = matrix.length;
+
+        transpose(matrix, N);
+        reverse(matrix, N);
+    }
+
+    void transpose(int[][] matrix, int n) {
+        for (int i = 0; i < n; i++) {
+            for (int j = i + 1; j < n; j++) {
+                int temp = matrix[j][i];
+                matrix[j][i] = matrix[i][j];
+                matrix[i][j] = temp;
+            }
+        }
+    }
+
+    void reverse(int[][] matrix, int n) {
+        for (int i = 0; i < n; i++) {
+            for (int j = 0; j < n / 2; j++) {
+                int temp = matrix[i][j];
+                matrix[i][j] = matrix[i][n - 1 - j];
+                matrix[i][n - 1 - j] = temp;
+            }
+        }
+    }
+}