Compilare: main.cpp: In function 'int main()': main.cpp:55:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | for(j=0;j<L[k].size();j++) | ~^~~~~~~~~~~~ main.cpp:74:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 74 | for(j=0;j<L[k].size();j++) | ~^~~~~~~~~~~~ main.cpp:93:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 93 | for(j=0;j<L[k].size();j++) | ~^~~~~~~~~~~~