Compilare: main.cpp: In function 'int bfs()': main.cpp:39:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, std::pair<long long int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | for (int i = 0; i < towards[curr_node].size(); i++) | ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:133:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, std::pair<long long int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 133 | for (int j = 0; j < towards[i].size(); j++) | ~~^~~~~~~~~~~~~~~~~~~