Compilare: user.cpp: In function ‘void solve()’: user.cpp:24:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[start].size();++i) ^ user.cpp:28:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[start].size();++i) ^ user.cpp:37:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[start].size();++i) ^ user.cpp:43:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v[y].size();++j) ^ user.cpp: In function ‘int main()’: user.cpp:72:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<fin.size();++i) ^