Compilare: main.cpp: In function 'void dfs(long long int)': main.cpp:14:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < lista[x].size(); i++) ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:45:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < lista[i].size(); j++) ~~^~~~~~~~~~~~~~~~~