Compilare: main.cpp: In function 'bool df(int)': main.cpp:24:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | for(int i=0;i<vec[nod].size();++i) | ~^~~~~~~~~~~~~~~~ main.cpp:30:1: warning: no return statement in function returning non-void [-Wreturn-type] 30 | } | ^ main.cpp: In function 'int main()': main.cpp:65:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 65 | for(int j=0;j<vec[i].size();++j) | ~^~~~~~~~~~~~~~ main.cpp:56:7: warning: 'root' may be used uninitialized in this function [-Wmaybe-uninitialized] 56 | df(root); | ~~^~~~~~