Compilare: user.cpp: In function ‘void GenSievePrimes(int)’: user.cpp:62:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (countPrimes == k + 1){ ^ user.cpp: In function ‘int main()’: user.cpp:79:12: warning: unused variable ‘n’ [-Wunused-variable] long long n; ^ user.cpp:82:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("prim.out", "w", stdout); ^ user.cpp:83:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &k); ^