Compilare: user.cpp: In function ‘void bf()’: user.cpp:23:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[start].size();i++) ^ user.cpp: In function ‘void dfs(int)’: user.cpp:38:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();i++) ^ user.cpp: In function ‘bool bfs()’: user.cpp:58:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<V[start].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:99:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<V[i].size();j++) ^