How do I merge two containers efficiently with std::set in performance-sensitive code?

In performance-sensitive code, merging two containers can be done efficiently using the `std::set` in C++. The `std::set` provides logarithmic time complexity for insertions, and because it is a sorted container, merging two sets can be done through standard algorithms like `std::set_union`. The following example demonstrates how to accomplish this:

#include <iostream> #include <set> #include <algorithm> int main() { std::set<int> set1 = {1, 3, 5, 7}; std::set<int> set2 = {2, 4, 6, 8}; std::set<int> mergedSet; // Merge the two sets std::set_union(set1.begin(), set1.end(), set2.begin(), set2.end(), std::inserter(mergedSet, mergedSet.begin())); // Output the merged set for (const auto& val : mergedSet) { std::cout << val << ' '; } std::cout << std::endl; return 0; }

merger std::set C++ performance-sensitive code efficient merging

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