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Cod sursa(job #18200)
#include<fstream.h>
int nr(int y, int a[100],int n)
{ int t=0;
for(int i=0;i<n;i++)
if(y==a[i]) t++;
return t;}
void main()
{long int n;
int x[100],a[100],k=0,i,y;
ifstream f("reguli.in");
ofstream g("reguli.out");
f>>n;
for(i=0;i<n;i++)
f>>x[i];
f.close();
a[++k]=x[1]-x[0];
for(i=1;i<n-1;i++)
{y=x[i+1]-x[i];
if(nr(y,a,k)==2) break;
else a[++k]=y;}
g<<k/2<<endl;
for(i=1;i<=k/2;i++)
g<<a[i]<<endl;
g.close();
}