1 files changed, 45 insertions, 0 deletions
diff --git a/581/main.cpp b/581/main.cpp
new file mode 100644
index 0000000..7aac338
--- /dev/null
+++ b/581/main.cpp
@@ -0,0 +1,45 @@
+
+#include "header.hpp"
+#include <algorithm>
+
+class Solution {
+public:
+  static int findUnsortedSubarray(std::vector<int> &nums) {
+    std::vector<int> nums_copy;
+    nums_copy.resize(nums.size());
+    std::copy(nums.begin(), nums.end(), nums_copy.begin());
+    std::sort(nums_copy.begin(), nums_copy.end());
+    int l = 0;
+    int n = nums.size() - 1;
+    bool begin = 0;
+    bool end = 0;
+    while (n > l) {
+      if (nums_copy[l] == nums[l]) {
+        l++;
+      } else {
+        begin = true;
+        break;
+      }
+    }
+    while (n > l) {
+      if (nums_copy[n] == nums[n]) {
+        n--;
+      } else {
+        end = true;
+        break;
+      }
+    }
+    if (end || begin)
+      return n - l + 1;
+    else
+      return 0;
+  }
+};
+
+int main(int argc, char **argv) {
+  std::vector<int> nums1 = {2, 6, 4, 8, 10, 9, 15};
+  std::vector<int> nums2 = {1, 2, 3, 4};
+  std::cout << Solution::findUnsortedSubarray(nums1) << std::endl;
+  std::cout << Solution::findUnsortedSubarray(nums2) << std::endl;
+  return 0;
+}