add: 220203

2202/220203.cpp

@@ -0,0 +1,25 @@
+#include <vector>
+#include <cstdio>
+#include <unordered_map>
+
+class Solution {
+public:
+	static int fourSumCount(const std::vector<int>& nums1, const std::vector<int>& nums2, const std::vector<int>& nums3, const std::vector<int>& nums4) {
+		int ret = 0;
+		std::unordered_map<int, int> m1, m2;
+		for (int i : nums1)
+			for (int j : nums2)
+				++m1[i + j];
+		for (int i : nums3)
+			for (int j : nums4)
+				++m2[i + j];
+		for (const auto& p : m1)
+			ret += p.second * m2[-p.first];
+		return ret;
+	}
+};
+
+int main() {
+	std::printf("%d\n", Solution::fourSumCount({0}, {0}, {0}, {0}));
+	return 0;
+}

2202/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2202)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2202 220202.cpp)
+ADD_EXECUTABLE(2202 220203.cpp)