Compilare: main.cpp: In function 'std::pair<int, int> minBuyC(std::vector<int>&, int, int)': main.cpp:11:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 11 | for(int i=1; i<=coins.size(); i++){ | ~^~~~~~~~~~~~~~ main.cpp:20:1: warning: control reaches end of non-void function [-Wreturn-type] 20 | } | ^