Package g3001_3100.s3092_most_frequent_ids

Class Solution

  • All Implemented Interfaces:
    
public final class Solution

    3092 - Most Frequent IDs.

    Medium

    The problem involves tracking the frequency of IDs in a collection that changes over time. You have two integer arrays, nums and freq, of equal length n. Each element in nums represents an ID, and the corresponding element in freq indicates how many times that ID should be added to or removed from the collection at each step.

    • Addition of IDs: If freq[i] is positive, it means freq[i] IDs with the value nums[i] are added to the collection at step i.

    • Removal of IDs: If freq[i] is negative, it means -freq[i] IDs with the value nums[i] are removed from the collection at step i.

    Return an array ans of length n, where ans[i] represents the count of the most frequent ID in the collection after the <code>i<sup>th</sup></code> step. If the collection is empty at any step, ans[i] should be 0 for that step.

    Example 1:

    Input: nums = 2,3,2,1, freq = 3,2,-3,1

    Output: 3,3,2,2

    Explanation:

    After step 0, we have 3 IDs with the value of 2. So ans[0] = 3. After step 1, we have 3 IDs with the value of 2 and 2 IDs with the value of 3. So ans[1] = 3. After step 2, we have 2 IDs with the value of 3. So ans[2] = 2. After step 3, we have 2 IDs with the value of 3 and 1 ID with the value of 1. So ans[3] = 2.

    Example 2:

    Input: nums = 5,5,3, freq = 2,-2,1

    Output: 2,0,1

    Explanation:

    After step 0, we have 2 IDs with the value of 5. So ans[0] = 2. After step 1, there are no IDs. So ans[1] = 0. After step 2, we have 1 ID with the value of 3. So ans[2] = 1.

    Constraints:

    • <code>1 <= nums.length == freq.length <= 10<sup>5</sup></code>

    • <code>1 <= numsi<= 10<sup>5</sup></code>

    • <code>-10<sup>5</sup><= freqi<= 10<sup>5</sup></code>

    • freq[i] != 0

    • The input is generated such that the occurrences of an ID will not be negative in any step.

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description

    • Field Summary

      Fields 
      Modifier and Type Field Description

    • Constructor Summary

      Constructors 
      Constructor Description
      Solution()

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description

    • Method Summary

      Modifier and Type Method Description
      final LongArray mostFrequentIDs(IntArray nums, IntArray freq)

      • Methods inherited from class java.lang.Object

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