K Closest Points to Origin

mediumcodingAlgorithmsSortingHeapArrays~30 min

Asked at Google, Meta

Overview

Given an array of points points where points[i] = [xi, yi] and an integer k, return the k closest points to the origin (0, 0). Distance is Euclidean. Return in any order.

Constraints

1 <= k <= points.length <= 10,000
-10,000 <= xi, yi <= 10,000

Examples

kClosest([[1,3],[-2,2]], 1);
// => [[-2,2]]  (distance √8 < √10)

kClosest([[3,3],[5,-1],[-2,4]], 2);
// => [[3,3],[-2,4]]

Solution

Reveal solution

function kClosest(points, k) {
  points.sort((a, b) => (a[0]*a[0] + a[1]*a[1]) - (b[0]*b[0] + b[1]*b[1]));
  return points.slice(0, k);
}

Resources

K Closest Points to Origin — LeetCode

k-closest-points-to-origin.js

K Closest Points to Origin

mediumcodingAlgorithmsSorting

Overview

Given an array of points points where points[i] = [xi, yi] and an integer k, return the k closest points to the origin (0, 0). Distance is Euclidean. Return in any order.

Constraints

1 <= k <= points.length <= 10,000
-10,000 <= xi, yi <= 10,000

Examples

kClosest([[1,3],[-2,2]], 1);
// => [[-2,2]]  (distance √8 < √10)

kClosest([[3,3],[5,-1],[-2,4]], 2);
// => [[3,3],[-2,4]]

Solution

Reveal solution

function kClosest(points, k) {
  points.sort((a, b) => (a[0]*a[0] + a[1]*a[1]) - (b[0]*b[0] + b[1]*b[1]));
  return points.slice(0, k);
}

Resources

K Closest Points to Origin — LeetCode

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