OJ Board

The judge says Compilation error

#include<stdio.h>
int sum=0;
int a[1000];
void find(int i,int j)
{
if(i==j)
{
sum+=a[j];
//printf("%d %d",a[0],a[1]);
return;
}
sum+=2*a[j]+a[j+1];
sum+=a[i-1];
if(i+2<j)
find(i+2,j);
else
{
if(j-i==1)
sum+=a[j];
else
sum+=a[i+1]+a[j]+a[j+1 ...