A. Easy h-index
The h-index of an author is the largest h where he has at least h papers with citations not less than h.
Bobo has published many papers. Given a0,a1,a2,…,an which means Bobo has published ai papers with
itations exactly i, ﬁnd the h-index of Bobo.
The input consists of several test cases and is terminated by end-of-ﬁle.
The ﬁrst line of each test case contains an integer n. The second line contains (n+1) integers a0,a1,…,an.
For each test case, print an integer which denotes the result.
• 1≤ n ≤2·105
• 0≤ ai ≤109
• The sum of n does not exceed 250,000.
1 2 3
0 0 0 0