cleaning up problem showing wrong ans... please tell my mistake

general
1

https://www.codechef.com/viewsolution/8444757

2

beginner… well, very basic mistake use different variable instead of “t”(which you reserv for test cases) in for loop. in your code:
for(i=1;i<=m;i++)
{
scanf("%d",&p); // you are using t here which is used to test cases.
a[p]=0; //use different variable let’s take ‘p’;
}

3

a[p] is error