How to sort a std::vector of std::pairs
Sort a std::vector<std::pair<...>> in-place by the first element of the pair:
sort_by_first.cpp
std::sort(ret.begin(), ret.end(), [](const auto& a, const auto& b) {
return a.first < b.first;
});Sort a std::vector<std::pair<...>> in-place by the second element of the pair:
sort_by_second.cpp
std::sort(ret.begin(), ret.end(), [](const auto& a, const auto& b) {
return a.second < b.second;
});
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