add: 220703-CN

cpp/2207/220703-CN.cpp

@@ -0,0 +1,23 @@
+#include <string>
+#include <algorithm>
+#include <stdexcept>
+
+/**
+ * 556. Next Greater Element III
+ * Given a positive integer n, find the smallest integer which has exactly the same digits existing in the integer n and is greater in value than n. If no such positive integer exists, return -1.
+ * Note that the returned integer should fit in 32-bit integer, if there is a valid answer but it does not fit in 32-bit integer, return -1.
+ */
+
+class Solution {
+public:
+	static int nextGreaterElement(int n) {
+		auto s = std::to_string(n);
+		if (!std::next_permutation(s.begin(), s.end()))
+			return -1;
+		try {
+			return std::stoi(s);
+		} catch (const std::out_of_range& e) {
+			return -1;
+		}
+	}
+};

cpp/2207/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2207)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2207 220702.cpp)
+ADD_EXECUTABLE(2207 220703-CN.cpp)