Compilare: user.cpp:2:35: warning: integer constant is so large that it is unsigned [enabled by default] long long nr,nr1,nr2,a,b,m,pp,max=10000000000000000000; ^ user.cpp: In function ‘void back(long long int, long long int)’: user.cpp:16:4: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(k<=18) ^ user.cpp: In function ‘int main()’: user.cpp:31:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("multiplu.out","w",stdout); ^ user.cpp:32:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("multiplu.in","r",stdin); ^ user.cpp:33:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld",&a,&b); ^