如何对 std::pair 的 std::vector 进行排序
按 pair 的 first 元素原地排序 std::vector<std::pair<...>>：
sort_by_first.cpp
std::sort(ret.begin(), ret.end(), [](const auto& a, const auto& b) {
return a.first < b.first;
});按 pair 的 second 元素原地排序 std::vector<std::pair<...>>：
sort_by_second.cpp
std::sort(ret.begin(), ret.end(), [](const auto& a, const auto& b) {
return a.second < b.second;
});Check out similar posts by category:
C/C++
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