Kitchen Timetable Problem Code: KTTABLE

1

Where i am wrong in this code?? Please help im trying my best but still anyone /…
#include <stdio.h>

int main() {
// your code goes here
int test,count=0,len,last=0;
scanf("%d",&test);

while(test--){
    int stud[1000000],req[1000000],diff[1000000];
    int len;
    scanf("%d",&len);
	
	for(int i=0;i<len;i++)
	{
	    scanf("%d",&stud[i]);
	}
	for(int i=0;i<len;i++)
	{
	    scanf("%d",&req[i]);
	}
	for(int i=0;i<len;i++)
	{
	    diff[i]=stud[i]-last;
	    last=stud[i];
	}
	for(int i=0;i<len;i++)
	{
	    if(diff[i]>=req[i])
	    {
	        count++;
	    }    
	}
	printf("%d\n",count);
}
return 0;

}