Compilare: user.cpp: In function ‘int dfs(int, int)’: user.cpp:15:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();i++) ~^~~~~~~~~~~~~~ user.cpp:17:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:40:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<niv[nr].size();i++) ~^~~~~~~~~~~~~~~ user.cpp:44:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(l=0;l<v[nod].size();l++)sum[l]=0; ~^~~~~~~~~~~~~~ user.cpp:47:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(l=0;l<v[nod].size();l++) ~^~~~~~~~~~~~~~ user.cpp:50:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(l=1;l<v[nod].size();l++) ~^~~~~~~~~~~~~~