Compilare: main.cpp: In function 'void df(int)': main.cpp:53:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | for(int i=0; i<v[nod].size(); ++i) | ~^~~~~~~~~~~~~~ main.cpp: In function 'void df2(int)': main.cpp:211:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 211 | for(int i=0; i<v[nod].size(); ++i) | ~^~~~~~~~~~~~~~ main.cpp:237:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 237 | for(int i=0; i<u[nod].size(); ++i) | ~^~~~~~~~~~~~~~