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Discussion of Problem 1118. Nontrivial Numbers

WA#1
Posted by ooo 16 Dec 2008 20:09
#include <iostream.h>
double a[1000000];
int sum(int);
bool prost(int);
int main()
{ int y=0,i,t,I,J; double N;
cin>>I>>J; t=I;
for(i=J;i>=I;i--)if(prost(i)) {cout<<i;y++; break;}
if(y==0) {for(i=0;i<=J-I;i++) {a[i]=(sum(t))/t;t++;}
N=a[0];
for(i=1;i<=J-I;i++) if(a[i]<N) N=a[i];
cout<<N;} return 0;}
int sum(int x)
{int s=0,i;
for(i=1;i<=x/2;i++) if(x%i==0) s+=i;
return s;}
bool prost(int x)
{int i; if(x==2) return true;
else for(i=2;i<=x/2;i++) if(x%i==0) return false;
return true;}