Compilare: main.cpp: In function 'int main()': main.cpp:40:26: 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 j=0;j<a.size()-1;j++) | ~^~~~~~~~~~~ main.cpp:58:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<graf>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | for(int i=0;i<g[nod].size();i++) | ~^~~~~~~~~~~~~~