Compilare: user.cpp: In function ‘int main()’: user.cpp:63:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int tt=0;tt<l[k-1].size();tt++){ ^ user.cpp:27:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%lld",&t); ^ user.cpp:29:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%lld",&n); ^ user.cpp:31:61: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%lld%lld",&v[i].first,&v[i].second); ^