Compilare: user.cpp: In function ‘void bfs(int, int)’: user.cpp:21:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<G[u].size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:41:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &n, &m, &x); ^ user.cpp:44:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &u, &v); ^