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Longest subarray with absolute difference equal to some number in JavaScript
We are required to write a JavaScript function that takes in an array of Numbers as the first argument, let's say arr, and a number, let's say num, as the second argument. The function should find and return the length of the longest subarray (contiguous or non-contiguous) whose each pair has an absolute difference less than or equal to num.
For example, if the input array and the number are −
const arr = [7, 9, 8, 6, 6, 3]; const num = 1;
Then the output should be −
const output = 3,
because the desired subarray is [7, 6, 6]
Example
The code for this will be −
const arr = [7, 9, 8, 6, 6, 3];
const maximumSubarray = (arr = [], num = 1) => {
if(!arr.length){
return 0;
};
const maximum = arr.reduce((acc, val) => Math.max(acc, val));
const buckets = new Array(maximum + 1);
buckets.fill(0);
const { length } = arr;
for(let i=0; i< length; i++){
buckets[arr[i]] += num;
};
let max = 0;
for(let j=1; j< maximum + 1; j++) {
let curr = buckets[j];
let prev = buckets[j - 1];
if(prev != 0 && prev + curr > max) {
max = prev + curr;
};
};
return max;
};
console.log(maximumSubarray(arr));Output
And the output in the console will be −
3
Updated on: 24-Feb-2021
57 Views
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