Cod sursa(job #677958)

Utilizator cata_popescuPopescu Catalina cata_popescu Data 10 februarie 2012 20:43:25
Problema Factorial Scor 100
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.35 kb
Raporteaza aceasta sursa 
#include<cstdio>
#define N 100000000
int p,i,j,t,s,k,l;
int main()
{freopen("fact.in","r",stdin);
freopen("fact.out","w",stdout);
scanf("%d",&p);
for(s=1;s<=N;s<<=1);
for(;s;s>>=1)
if(s+i<=N)
{j=5*(i+s),t=0;
for(k=5;k<=j;k*=5)
t=t+j/k;
if(t<=p)
i+=s,l=t;}
if(!p)
printf("1");
else
if(l==p)
printf("%d",5*i);
else
printf("-1");
return 0;}