Cod sursa(job #47318)
Utilizator | Data | 3 aprilie 2007 16:08:59 | |
---|---|---|---|
Problema | Factorial | Scor | 0 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.39 kb |
#include<stdio.h>
int main()
{long long unsigned pr,n,p,i,j,m,nr;
FILE *f=fopen("fact.in","r");
FILE*g=fopen("fact.out","w");
fscanf(f,"%llu",&p);
i=0;
j=6000000000;
while (i<=j)
{ m=(i+j)/2;
nr=0; pr=5;
while(m/pr!=0) {nr+=m/pr; pr*=5;}
if (nr==p) {fprintf(g,"%llu",m); break;}
else if (nr<p) i=m+1;
else j=m-1;}
if (i>j) fprintf(g,"-1");
fclose(f);
fclose(g);
return 0;}