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- #include<stdio.h>
- main()
- {
- int n , k , tem=0 , i ;
- long long int arr[100009]={} ;
- scanf("%d %d",&n , &k);
- for(i=0 ; i<n ; i++)
- {
- scanf("%d",&arr[i]);
- }
- for(i=1 ;tem <k ; i++)
- {
- tem = tem+i;
- }
- tem=tem-(i-1) ;
- k=k-tem ;
- printf("%I64d\n",arr[k-1]);
- return 0 ;
- }
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