Compilare: main.cpp: In function 'int main()': main.cpp:33:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | while (i < mars.size()) { | ~~^~~~~~~~~~~~~ main.cpp:37:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | while (j < mars.size() && mars[i].first == mars[j].first) { | ~~^~~~~~~~~~~~~ main.cpp:43:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | if (j < mars.size()) { | ~~^~~~~~~~~~~~~