Compilare: main.cpp: In function 'void df(int)': main.cpp:47:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | for(int i=0;i<vec[nod].size();++i) | ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:131:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 131 | for(int j=0;j<vec[i].size();++j) | ~^~~~~~~~~~~~~~ main.cpp:111:7: warning: 'root' may be used uninitialized in this function [-Wmaybe-uninitialized] 111 | df(root); | ~~^~~~~~