Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:17:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[val].size(); i += 2){ ^ user.cpp: In function ‘void read()’: user.cpp:27:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d", &n, &m, &p, &u); ^ user.cpp:29:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &x, &y, &z); ^