add: 220210

2202/220210.cpp

@@ -0,0 +1,23 @@
+#include <vector>
+#include <cstdio>
+#include <unordered_map>
+
+class Solution {
+public:
+	static int subarraySum(const std::vector<int>& nums, int k) {
+		int sum = 0, ret = 0;
+		std::unordered_map<int, int> m;
+		m.reserve(nums.size());
+		m[0] = 1;
+		for (int i : nums) {
+			ret += m[(sum += i) - k];
+			++m[sum];
+		}
+		return ret;
+	}
+};
+
+int main() {
+	std::printf("%d\n", Solution::subarraySum({1,2,3}, 3));
+	return 0;
+}

2202/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2202)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2202 220210-CN.cpp)
+ADD_EXECUTABLE(2202 220210.cpp)