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Nov 17th, 2018
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  1. #include <stdio.h>
  2.  
  3. int main(){
  4.  
  5. int k,n,a[101000],benar;
  6.  
  7. scanf("%d %d",&n,&k);
  8.  
  9. for (int i=1;i<=n;i++){
  10. scanf("%d",&a[i]);
  11. }
  12.  
  13. for (int j=k;j<=n;j++){
  14. if(a[j]!=a[k])
  15. {printf("-1\n");return 0;
  16. }
  17. }
  18.  
  19. for (int j=k;j>0;j--){
  20. if(a[j]!=a[k])
  21. printf("%d\n",j);return 0;
  22. }
  23.  
  24. getchar();getchar();
  25. return 0;
  26. }
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