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Cod sursa(job #76088)
#include<stdio.h>
#include<conio.h>
int main()
{
unsigned int p=0, p2=0, p5=0, n, n2,n5;
clrscr();
FILE *f=NULL;
f=fopen("factoria.in","r");
fscanf(f,"%d\n",&p);
fclose(f);
n=0;
printf("Toate bune si frumoase...\np=%d\n",p);
do
{
n++;
n2=n;
while(!(n2%2)){
p2++;
n2=n2/2;
}
n5=n;
while(!(n5%5)){
p5++;
n5=n5/5;
}
}while (p5<p);
n=((!p)?1:n);
printf("p2=%d, iar p5=%d\nn=%d", p2, p5, n);
f=fopen("factoria.out","w");
if ((p2==p) && (p2==p5))
fprintf(f, "%d", n);
else
fprintf(f,"-1");
fclose(f);
return 0;
}