solve problem

Author: delight010

spiral-matrix/delight010.swift

@@ -0,0 +1,38 @@
+class Solution {
+    func spiralOrder(_ matrix: [[Int]]) -> [Int] {
+        var answer: [Int] = []
+        var top = 0
+        var bottom = matrix.endIndex - 1
+        var left = 0
+        var right = matrix[0].endIndex - 1
+        while top <= bottom && left <= right {
+            for column in left...right {
+                answer.append(matrix[top][column])
+            }
+            top += 1
+            
+            if top <= bottom {
+                for row in top...bottom {
+                    answer.append(matrix[row][right])
+                }
+            }
+            right -= 1
+            
+            if top <= bottom {
+                for column in stride(from: right, through: left, by: -1) {
+                    answer.append(matrix[bottom][column])
+                }
+            }
+            bottom -= 1
+            
+            if left <= right {
+                for row in stride(from: bottom, through: top, by: -1) {
+                    answer.append(matrix[row][left])
+                }
+            }
+            left += 1
+        }
+        return answer
+    }
+}
+