Smallest Range Covering Elements from K Lists

arrayhash tablegreedy

Problem Statement

You have k lists of sorted integers in non-decreasing order . Find the smallest range that includes at least one number from each of the k lists.

We define the range [a, b] is smaller than range [c, d] if b - a < d - c or a < c if b - a == d - c .

Examples

Example 1

Input: nums = [[4,10,15,24,26],[0,9,12,20],[5,18,22,30]]
Output: [20,24]
List 1: [4, 10, 15, 24,26], 24 is in range [20,24].
List 2: [0, 9, 12, 20], 20 is in range [20,24].
List 3: [5, 18, 22, 30], 22 is in range [20,24].

Example 2

Input: nums = [[1,2,3],[1,2,3],[1,2,3]]
Output: [1,1]

Constraints

nums.length == k

1 <= k <= 3500

1 <= nums[i].length <= 50

-10 ^5 <= nums[i][j] <= 10 ^5

nums[i] is sorted in non-decreasing order.

😤

Hard

Difficulty

Topic Info

ModuleDSA

CategoryArray

Sub-topicHash Table