Compilare: user.cpp: In function ‘void cache_bc(int, int)’: user.cpp:27:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < con.size(); i++) { ^ user.cpp: In function ‘void DF(int, int, int)’: user.cpp:35:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a[nod].size(); i++) { ^