Compilare: user.cpp: In function ‘int main()’: user.cpp:78:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<v[1].size();i++) ^ user.cpp:93:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<v[u].size();i++) ^ user.cpp:62:22: warning: unused variable ‘nr’ [-Wunused-variable] int n,m,a,b,cost,nr=1; ^