Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:22:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i=0;i<v[x].size();++i ){ ^ user.cpp: In function ‘int main()’: user.cpp:59:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i=0;i<rez.size();++i ) ^ user.cpp:16:5: warning: assuming signed overflow does not occur when assuming that (X - c) > X is always false [-Wstrict-overflow] if ( a>b )return a; ^