Merge pull request neetcode-gh#168 from r1cky0/patch-14

Create 54-Spiral-Matrix.java

Author: neetcode-gh

java/54-Spiral-Matrix.java

@@ -0,0 +1,37 @@
+class Solution {
+    public List<Integer> spiralOrder(int[][] matrix) {
+        List<Integer> list = new ArrayList<>();
+        int rb = 0;
+        int re = matrix.length - 1;
+        int cb = 0;
+        int ce = matrix[0].length - 1;
+        
+        while (rb <= re && cb <= ce) {
+            for (int j = cb; j <= ce; j++) {
+                list.add(matrix[rb][j]);
+            }
+            rb++;
+            
+            for (int i = rb; i <= re; i++) {
+                list.add(matrix[i][ce]);
+            }
+            ce--;
+            
+            if (rb <= re) {
+                for (int j = ce; j >= cb; j--) {
+                    list.add(matrix[re][j]);
+                }
+            }
+            re--;
+            
+            if (cb <= ce) {
+                for (int i = re; i >= rb; i--) {
+                    list.add(matrix[i][cb]);
+                }
+            }
+            cb++;
+        }
+        
+        return list;
+    }
+}