Compilare: user.cpp: In function ‘void rez()’: user.cpp:56:17: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] if(nrsub&1 == 1 && nrsub!=0) ^ user.cpp:41:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &a, &b); ^ user.cpp: In function ‘int main()’: user.cpp:66:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pinex.in", "r", stdin); ^ user.cpp:67:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pinex.out", "w", stdout); ^ user.cpp:68:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp: In function ‘void ciur()’: user.cpp:12:19: warning: iteration 499998u invokes undefined behavior [-Waggressive-loop-optimizations] sir[i] = 1; ^ user.cpp:11:21: note: containing loop for(int i = 4; i<=1000000; i+=2) ^