Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:14:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[where].size(); i ++) { ^ user.cpp: In function ‘int main()’: user.cpp:39:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &n, &m); ^ user.cpp:41:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &t[i]); ^ user.cpp:52:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &x, &y); ^