Compilare: main.cpp: In function 'bool verif(int, std::vector<std::vector<int> >&)': main.cpp:15:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < H[k].size(); i++) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:47:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size() - 1; i++) ~~^~~~~~~~~~~~~~ main.cpp:48:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i + 1; j < v.size(); j++) ~~^~~~~~~~~~