Compilare: user.cpp: In function ‘void bf(int)’: user.cpp:15:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < q.size(); i ++) { ^ user.cpp:18:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[in].size(); i ++) { ^ user.cpp: In function ‘void dfsus(int, int)’: user.cpp:33:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[in].size(); i ++) { ^ user.cpp: In function ‘int main()’: user.cpp:70:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int T; fscanf(f, "%d", &T); ^ user.cpp:72:58: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d %d %d", &n, &r[1], &r[2], &r[3]);//f >> n >> r[1] >> r[2] >> r[3]; ^ user.cpp:78:77: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &a, &b), L[a].push_back(b), L[b].push_back(a); ^