Compilare: main.cpp: In function 'void bfs(int)': main.cpp:25:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for (int i=0; i<g[nod].size(); i++) { | ~^~~~~~~~~~~~~~ main.cpp:31:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for (int i=0; i<g[nd].size(); i++) { | ~^~~~~~~~~~~~~ main.cpp:42:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | for (int i=0; i<fr.size(); i++) { | ~^~~~~~~~~~