Compilare: main.cpp: In function 'int main()': main.cpp:59:21: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 59 | while(sol.size()<n-1) | ~~~~~~~~~~^~~~ main.cpp:71:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 71 | for(i=0;i<sol.size();++i) | ~^~~~~~~~~~~