Compilare: user.cpp: In function ‘int dfs(int)’: user.cpp:13:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[nod].size();i++) ~^~~~~~~~~~~~~~ user.cpp:20:5: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation] for(i=0;viz1[i];i++); ^~~ user.cpp:21:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘for’ sg[nod]=i; ^~ user.cpp:22:5: warning: no return statement in function returning non-void [-Wreturn-type] } ^