stable_sort

sort / stable_sort

#include #include #include using namespace std; bool compare(pair a, pair b) { return a.first < b.first; } int main() { ios_base::sync_with_stdio(false); cin.tie(nullptr); vector v, v2; v.push_back(make_pair(1,2)); v.push_back(make_pair(4,4)); v.push_back(make_pair(4,2)); v.push_back(make_pair(3,2)); v.push_back(make_pair(5,2)); v.push_back(make_pair(7,4)); v.push_back(make_pair(9,7)); v2 = v; c..