Compilare: main.cpp: In function 'int main()': main.cpp:36:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < j.size(); i++) ~~^~~~~~~~~~ main.cpp:45:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (k<=e[j.back()].size()) ~^~~~~~~~~~~~~~~~~~~~ main.cpp:49:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (e[j[i]].size() <= k) continue; ~~~~~~~~~~~~~~~^~~~