Compilare: main.cpp: In function 'int main()': main.cpp:53:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<primes.size()&&primes[i]*primes[i]<=cn && n>1;++i) ~^~~~~~~~~~~~~~ main.cpp:46:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&t); ^ main.cpp:50:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%lld",&n); ^