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 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 2^nd smallest number is 251 at index 2.

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

1. Trimmed to the last 2 digits, nums is unchanged. The 2^nd 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 and Description
Solution()

Method Summary

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

Methods inherited from class java.lang.Object

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

Constructor Detail

Solution

public Solution()

Method Detail

smallestTrimmedNumbers

public int[] smallestTrimmedNumbers(String[] nums,
                                    int[][] queries)