Compilare: main.cpp: In function 'int main()': main.cpp:36:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | for (int i=0; i<sol1.size(); ++i) { | ~^~~~~~~~~~~~ main.cpp:40:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | for (int i=0; i<sol2.size(); ++i) { | ~^~~~~~~~~~~~