Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:38:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < vecin[x].size(); ++i) ^ user.cpp:42:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < vecin[nod].size(); ++i){ ^ user.cpp:46:57: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < vecin[new_node].size(); ++j) ^ user.cpp: In function ‘void write()’: user.cpp:59:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < sol.size(); ++i) ^