Compilare: user.cpp: In function ‘double greedy(int)’: user.cpp:24:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (k < v2.size() && gtmp + v2[k].second < G) { ^ user.cpp:29:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k < v2.size()) ^ user.cpp: In function ‘int main()’: user.cpp:53:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < v1.size(); ++j) ^