vector pair sort

bool strict_weak_ordering(const std::pair a, const std::pairb) { return a.first < b.first; }int main() { using namespace std; vector > vec; vec.push_back(make_pair(5, "hello")); vec.push_back(make_pair(4, "hell")); vec.push_back(make_pair(6, "hello,")); sort(vec.begin(), vec.end(), strict_weak_ordering); vector【vector pair sort】 >::iterator it = vec.begin(), end = vec.end(); for(; it != end; ++it) cout<second<


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