Compilare: user.cpp: In function ‘void BFS(int, int)’: user.cpp:16:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < taba[pr.first].size() ; i++){ ~~^~~~~~~~~~~~~~~~~~~~~~~ user.cpp:20:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < tabb[pr.first].size() ; i++){ ~~^~~~~~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:44:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < order.size() ; i++){ ~~^~~~~~~~~~~~~~