Create 0054-spiral-matrix.swift

Author: drxlx

swift/0054-spiral-matrix.swift

@@ -0,0 +1,35 @@
+/**
+ * Question Link: https://leetcode.com/problems/spiral-matrix/
+ */
+
+ class Solution {
+    func spiralOrder(_ matrix: [[Int]]) -> [Int] {
+        var res = [Int]()
+        var l = 0
+        var r = matrix[0].count
+        var t = 0
+        var b = matrix.count
+        while l < r && t < b {
+            for i in l..<r {
+                res.append(matrix[t][i])
+            }
+            t += 1
+            for i in t..<b {
+                res.append(matrix[i][r - 1])
+            }
+            r -= 1
+            if !(l < r && t < b) {
+                break
+            }
+            for i in stride(from: r - 1, to: l - 1, by: -1) {
+                res.append(matrix[b - 1][i])
+            }
+            b -= 1
+            for i in stride(from: b - 1, to: t - 1, by: -1) {
+                res.append(matrix[i][l])
+            }
+            l += 1
+        }
+        return res
+    }
+}