Compilare: user.cpp: In function ‘void solve1()’: user.cpp:41:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < vc[nod].size(); i++) ^ user.cpp: In function ‘void solve2()’: user.cpp:59:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size(); i++) ^ user.cpp: In function ‘void solve3()’: user.cpp:78:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:99:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < s.size(); j++) ^