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Cod sursa(job #18366)
#include<stdio.h>
long long n,i,j,poz;
long long x,y,a[500001];
int main()
{
freopen("reguli.in","r",stdin);
freopen("reguli.out","w",stdout);
scanf("%lld",&n);
scanf("%lld%lld",&x,&y);
a[1]=y-x;
for(i=2;i<n;i++)
{
x=y;
scanf("%lld",&y);
a[i]=y-x;
}
poz=1;
for(i=2;i<n;i++)
if(a[i]!=a[1])
poz=i;
else
{
for(j=poz+1;j<n;j++)
{
if(j%poz==0&&a[j]!=a[poz])
break;
else
if(j%poz&&a[j]!=a[j%poz])
break;
}
if(j==n)
break;
else
{
i=j;
poz=j;
}
}
printf("%lld\n",poz);
for(i=1;i<=poz;i++)
printf("%lld\n",a[i]);
return 0;
}