Compilare: user.cpp: In function ‘int kuhn(int)’: user.cpp:17:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<g[v].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:37:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<s.size();j++) ^ user.cpp:41:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ('0'<=s[j] && s[j]<='9' && j<s.size()) x=x*10+s[j]-'0',j++; ^ user.cpp:53:13: warning: unused variable ‘k’ [-Wunused-variable] int k=kuhn(i); ^