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H-Index II

Given an array of citations sorted in ascending order (each citation is a non-negative integer) of a researcher, write a function to compute the researcher's h-index. According to the  definition of h-index on Wikipedia : "A scientist has index  h  if  h  of his/her  N  papers have  at least   h  citations each, and the other  N − h  papers have  no more than   h  citations each." Example: Input: citations = [0,1,3,5,6] Output: 3 Explanation: [0,1,3,5,6] means the researcher has 5 papers in total and each of them had received 0 , 1, 3, 5, 6 citations respectively.   Since the researcher has 3 papers with at least 3 citations each and the remaining two with no more than 3 citations each, her h-index is 3 . Note: If there are several possible values for  h , the maximum one is taken as the h-index.   class Solution { ...