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- #include <bits/stdc++.h>
- using namespace std;
- int main()
- {
- int t;
- scanf("%d",&t);
- while (t--)
- {
- int n,x,sum=0,l=-1,r;
- scanf("%d%d",&n,&x);
- for (int i=0;i<n;i++)
- {
- int a;
- scanf("%d",&a);
- if (a%x)
- {
- if (l==-1)
- l=i;
- r=i;
- }
- sum+=a;
- }
- if (sum%x)
- printf("%d\n",n);
- else if (l==-1)
- printf("-1\n");
- else
- printf("%d\n",n-min(l+1,n-r));
- }
- }
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