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Oct 6th, 2015
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  1. #include<stdio.h>
  2. int a[100],flag;
  3. int main() {
  4. int t,n;
  5. scanf("%d",&t);
  6. while(t--) {
  7. scanf("%d",&n);
  8. flag=0;
  9. int i;
  10. for(i=0;i<n;i++) {
  11. scanf("%d",&a[i]);
  12. if(i==0)
  13. continue;
  14. int p=i-1;
  15. while(p>=0) {
  16. if(a[i]==a[p]) {
  17. flag=1;
  18. break;
  19. }
  20. }
  21. if(flag==1)
  22. break;
  23. }
  24. if(flag)
  25. printf("NO\n");
  26. else
  27. printf("YES\n");
  28. }
  29. return 0;
  30. }
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