Package g2301_2400.s2343_query_kth_smallest_trimmed_number

Class Solution

java.lang.Object
g2301_2400.s2343_query_kth_smallest_trimmed_number.Solution
public class Solution extends java.lang.Object
2343 - Query Kth Smallest Trimmed Number.

Medium

You are given a 0-indexed array of strings nums, where each string is of equal length and consists of only digits.

You are also given a 0-indexed 2D integer array queries where queries[i] = [ki, trimi]. For each queries[i], you need to:

  • Trim each number in nums to its rightmost trimi digits.
  • Determine the index of the kith smallest trimmed number in nums. If two trimmed numbers are equal, the number with the lower index is considered to be smaller.
  • Reset each number in nums to its original length.

Return an array answer of the same length as queries, where answer[i] is the answer to the ith query.

Note:

  • To trim to the rightmost x digits means to keep removing the leftmost digit, until only x digits remain.
  • Strings in nums may contain leading zeros.

Example 1:

Input: nums = [“102”,“473”,“251”,“814”], queries = [[1,1],[2,3],[4,2],[1,2]]

Output: [2,2,1,0]

Explanation:

  1. After trimming to the last digit, nums = [“2”,“3”,“1”,“4”]. The smallest number is 1 at index 2.

  2. Trimmed to the last 3 digits, nums is unchanged. The 2nd smallest number is 251 at index 2.

  3. Trimmed to the last 2 digits, nums = [“02”,“73”,“51”,“14”]. The 4th smallest number is 73.

  4. Trimmed to the last 2 digits, the smallest number is 2 at index 0.

    Note that the trimmed number “02” is evaluated as 2.

Example 2:

Input: nums = [“24”,“37”,“96”,“04”], queries = [[2,1],[2,2]]

Output: [3,0]

Explanation:

  1. Trimmed to the last digit, nums = [“4”,“7”,“6”,“4”]. The 2nd smallest number is 4 at index 3.

    There are two occurrences of 4, but the one at index 0 is considered smaller than the one at index 3.

  2. Trimmed to the last 2 digits, nums is unchanged. The 2nd smallest number is 24.

Constraints:

  • 1 <= nums.length <= 100
  • 1 <= nums[i].length <= 100
  • nums[i] consists of only digits.
  • All nums[i].length are equal.
  • 1 <= queries.length <= 100
  • queries[i].length == 2
  • 1 <= ki <= nums.length
  • 1 <= trimi <= nums[i].length

Follow up: Could you use the Radix Sort Algorithm to solve this problem? What will be the complexity of that solution?

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    int[]
    smallestTrimmedNumbers(java.lang.String[] nums, int[][] queries)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • smallestTrimmedNumbers

      public int[] smallestTrimmedNumbers(java.lang.String[] nums, int[][] queries)