Compilare: main.cpp: In function 'int BFS_zone(int, int)': main.cpp:66:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(vecini[(*it)].size()>=k and viz[(*it)]==0) ~~~~~~~~~~~~~~~~~~~~^~~ main.cpp: In function 'int main()': main.cpp:119:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(vecini[i].size()<k) ~~~~~~~~~~~~~~~~^~ main.cpp:130:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(vecini[*it].size()==k-1) ~~~~~~~~~~~~~~~~~~^~~~~