Compilare: user.cpp: In function ‘int main()’: user.cpp:37:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < V[i].size(); j++) ^ user.cpp:42:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; !found && k < V[j].size(); k++) ^ user.cpp:46:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < V[j].size(); k++) ^ user.cpp:55:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sol.size(); i++) ^