Compilare: user.cpp: In function ‘int main()’: user.cpp:21:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(r.size() < i) { ^ user.cpp:22:53: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < in && r.size() < i; j ++) ^ user.cpp:31:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < r.size(); i ++) fprintf(g, "%lld\n", r[i]); ^ user.cpp:15:64: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] long long x1, x2; fscanf(f, "%d %lld %lld\n", &n, &x1, &x2); ^ user.cpp:18:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%lld", &x2); ^