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- #include <bits/stdc++.h>
- int main()
- {
- int n,k,i;
- std::cin >> n >> k;
- int a[n];
- for (i=0; i<n; i++)
- std::cin >> a[i];
- std::sort(a,a+n);
- if (k==0 || a[k-1]==a[k])
- std::cout << -1;
- else
- std::cout << a[k]-1;
- }
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