Compilare: main.cpp: In function 'void GetPrimes(std::vector<int>&)': main.cpp:10:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2; i <= primes.size()/2; i++) ~~^~~~~~~~~~~~~~~~~~ main.cpp:12:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 2; j*i <= primes.size()/2; j++) ~~~~^~~~~~~~~~~~~~~~~~ main.cpp:15:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2; i <= primes.size()/2; i++) ~~^~~~~~~~~~~~~~~~~~ main.cpp:17:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i*i; j < primes.size(); j *= i) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int GetNr(std::vector<int>, int, int)': main.cpp:24:26: warning: unused variable 'i2' [-Wunused-variable] long nr = 0, i2; ^~