what does meant by runtime error(NJEC)?

include<stdio.h>

void main() { int i,j,n,temp; scanf("%d",&n); int a[n]; for(i=0;i<n;i++) scanf("%d",&a[i]);="" for(i="0;i&lt;(n-1);i++)" {="" if(i%2="=0)" {="" if(a[i]="">a[i+1]) { temp=a[i]; a[i]=a[i+1]; a[i+1]=temp; } } else { if(a[i]<a[i+1]) { temp=a[i]; a[i]=a[i+1]; a[i+1]=temp; } } } for(i=0;i<n;i++) printf("%d\t",a[i]); }