Compilare: user.cpp: In function ‘void eu(int)’: user.cpp:16:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<gr[v].size(); ++i) if(gr[v][i]==s) { ^ user.cpp: In function ‘int main()’: user.cpp:40:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(r.size()==m+1 && (odd==0 || odd==2)) { ^ user.cpp:30:9: warning: unused variable ‘ok’ [-Wunused-variable] int ok=1; ^