Compilare: main.cpp: In function 'int bfs()': main.cpp:27:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[curent].size();i++){ ~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:65:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a[100].size(); i++){ ~^~~~~~~~~~~~~~