18jul23hIdx.ts

// Given an array of integers citations where citations[i] is the number of citations a researcher received for their ith paper, return the researcher's h-index.

// According to the definition of h-index on Wikipedia: The h-index is defined as the maximum value of h such that the given researcher has published at least h papers that have each been cited at least h times.

//

// Example 1:

// Input: citations = [3,0,6,1,5]
// Output: 3
// Explanation: [3,0,6,1,5] 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, their h-index is 3.

// Example 2:

// Input: citations = [1,3,1]
// Output: 1

//

// Constraints:

//     n == citations.length
//     1 <= n <= 5000
//     0 <= citations[i] <= 1000

function hIndex(citations):number {
  let sortedArr:number[] = citations.sort((a, b) => b - a);
  let hIdx:number = 0;

  for (let i:number = 0; i < sortedArr.length; i++) {
    if (sortedArr[i] >= i + 1) {
      hIdx = i + 1;
    } else {
      break;
    }
  }
  return hIdx;
}

var hIndex2 = function(citations) {
  citations.sort((a, b) => b - a); // Sort the array in descending order
  const n = citations.length;
  let hIndex = 0;

  for (let i = 0; i < n; i++) {
    if (citations[i] >= i + 1) {
      hIndex = i + 1;
    } else {
      break;
    }
  }

  return hIndex;
};