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 1 2 2 1 2 3 3 0 0 0 0
1 2 0
题意：给定被引用次数为 0~n 的论文分别有几张，找到最大的 h，满足被引用次数大于等于 h 的论文至少有 h 张
思路：在区间 [0,n] 内二分答案；或直接从 n~0 遍历找到第一个满足条件的 h
后 AC 代码