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- #include<stdio.h>
- int a[100],flag;
- int main() {
- int t,n;
- scanf("%d",&t);
- while(t--) {
- scanf("%d",&n);
- flag=0;
- int i;
- for(i=0;i<n;i++) {
- scanf("%d",&a[i]);
- if(i==0)
- continue;
- int p=i-1;
- while(p>=0) {
- if(a[i]==a[p]) {
- flag=1;
- break;
- }
- }
- if(flag==1)
- break;
- }
- if(flag)
- printf("NO\n");
- else
- printf("YES\n");
- }
- return 0;
- }
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