Compilare: main.cpp:50:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] main() ^ main.cpp: In function 'int main()': main.cpp:68:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(adj[i].size() == k) ~~~~~~~~~~~~~~^~~~ main.cpp:84:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(adj[i].size() == k && M1[i] == 0 && cuplaj(i) == true) ~~~~~~~~~~~~~~^~~~