add: 220114

2201/220114-CN.cpp

@@ -0,0 +1,50 @@
+#include <vector>
+#include <iostream>
+#include <queue>
+
+class Solution {
+private:
+	static auto getCartesianProduct(const std::vector<int>& p, const std::vector<int>& q, int limP, int limQ) {
+		std::vector<std::vector<int>> ret;
+		for (int i = 0; i < limP; ++i) {
+			for (int j = 0; j < limQ; ++j) {
+				ret.push_back({p[i], q[j]});
+			}
+		}
+		return ret;
+	}
+public:
+	static auto kSmallestPairs(const std::vector<int>& nums1, const std::vector<int>& nums2, int k) {
+		auto n1 = nums1.size(), n2 = nums2.size();
+		if (k >= n1 * n2)
+			return getCartesianProduct(nums1, nums2, n1, n2);
+		std::vector<std::vector<int>> ret;
+
+		auto cmp = [&] (const std::vector<int>& i, const std::vector<int>& j) {
+			return nums1[i[0]] + nums2[i[1]] > nums1[j[0]] + nums2[j[1]];
+		};
+
+		std::priority_queue<std::vector<int>, std::vector<std::vector<int>>, decltype(cmp)> q(cmp);
+		for (int i = 0; i < n1; ++i) {
+			q.push({i, 0});
+		}
+
+		for (int i = 0; i < k; ++i) {
+			auto t = q.top();
+			q.pop();
+			ret.push_back({nums1[t[0]], nums2[t[1]]});
+			if (1 + t[1] < n2)
+				q.push({t[0], 1 + t[1]});
+		}
+
+		return ret;
+	}
+};
+
+int main() {
+	auto ret = Solution::kSmallestPairs({-10, -4, 0, 0, 6}, {3, 5, 6, 7, 8, 100}, 10);
+	for (const auto& i: ret) {
+		std::printf("[%d, %d]\n", i[0], i[1]);
+	}
+	return 0;
+}

2201/220114.cpp

@@ -0,0 +1,32 @@
+#include <string>
+#include <iostream>
+#include <cctype>
+
+class Solution {
+public:
+	static int myAtoi(const std::string& s) {
+		long long ret = 0;
+		int sgn = 1, pos = 0;
+		for (; std::isspace(s[pos]); ++pos);
+		if (s[pos] == '-')
+			sgn = -sgn;
+		if (s[pos] == '-' || s[pos] == '+')
+			++pos;
+		for (; std::isdigit(s[pos]); ++pos) {
+			ret = (ret << 3) + (ret << 1) + (s[pos] ^ 48);
+			if (ret > INT32_MAX)
+				break;
+		}
+		ret *= sgn;
+		if (ret < INT32_MIN)
+			return INT32_MIN;
+		else if (ret > INT32_MAX)
+			return INT32_MAX;
+		return int(ret & 0xFFFFFFFFLL);
+	}
+};
+
+int main() {
+	std::cout << Solution::myAtoi("42");
+	return 0;
+}

2201/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2201)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2201 220113.cpp)
+ADD_EXECUTABLE(2201 220114-CN.cpp)