/**

* Difficulty:

* Medium

*

* Desc:

* Given an array of citations (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:

* given citations = [3, 0, 6, 1, 5],

* which means the researcher has 5 papers in total

* and each of them had received 3, 0, 6, 1, 5 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, his h-index is 3.

*

* Note:

* If there are several possible values for h, the maximum one is taken as the h-index.

*/

/**

* @param {number[]} citations

* @return {number}

*/

var hIndex = function(citations) {

citations.sort((pre, next) => pre - next);

for (let i = 0; i < citations.length; i += 1) {

const largerCount = citations.length - i;

const num = citations[i];

if (largerCount <= num) return largerCount;

}

return 0;

};