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Smallest possible length constituting greatest frequency in JavaScript
Problem
We are required to write a JavaScript function that takes in an array of numbers, arr, as the first and the only argument.
Our function is supposed to find the smallest possible length of a (contiguous) subarray of the array arr, that has the same greatest frequency of any element as the whole array.
For example, if the input to the function is
Input
const arr = [55, 77, 77, 88, 55];
Output
const output = 2;
Output Explanation
The input array has the greatest frequency for any element of 2 because both elements 55 and 77 appear twice.
Of the subarrays that have the greatest frequency as the whole array, the shortest length is 2. So, we return 2.
Example
Following is the code −
const arr = [55, 77, 77, 88, 55]; const shortestLength = (arr) => { let freq = 0 let len = Infinity arr.reduce((acc, num, index) => { if (acc[num] !== undefined) { acc[num].freq += 1 acc[num].range[1] = index } else { acc[num] = { freq: 0, range: [index, index], } } if (acc[num].freq > freq) { freq = acc[num].freq len = acc[num].range[1] - acc[num].range[0] + 1 } else if (acc[num].freq === freq) { len = Math.min( len, acc[num].range[1] - acc[num].range[0] + 1, ) } return acc }, {}) return len }; console.log(shortestLength(arr));
Output
2
Updated on: 27-Jun-2022
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