Compilare: user.cpp: In function ‘void comp_primes()’: user.cpp:83:9: warning: unused variable ‘j’ [-Wunused-variable] int i, j, mmax = 1000001; ^ user.cpp: In function ‘int main()’: user.cpp:157:9: warning: unused variable ‘i’ [-Wunused-variable] int t, i; ^ user.cpp: In function ‘void solve()’: user.cpp:106:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %lld", &A, &B); ^ user.cpp: In function ‘int main()’: user.cpp:149:50: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen((fileInput + ".in").c_str(), "r", stdin); ^ user.cpp:150:52: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen((fileInput + ".out").c_str(), "w", stdout); ^ user.cpp:160:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^