Compilare: user.cpp: In function ‘int main()’: user.cpp:33:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < primes.size(); i++) { ^ user.cpp:37:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 1; j < primes.size(); j++) { ^ user.cpp:18:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&n); ^