Tiktok Equalizing Bandwidth

TikTok Infrastructure team has n backend servers that process real-time API requests. Each server has a current bandwidth allocation (in Mbps) in an array servers, and the team needs to equalize the bandwidth across all servers for efficient load distribution.

Maintenance Cycles

Maintenance cycles occur in two phases, alternating every hour:

Light Upgrade

• Can only be applied on odd hours.
• Select any server and increase its bandwidth by 1 Mbps.

Heavy Upgrade

• Can only be applied on even hours.
• Select any server and increase its bandwidth by 2 Mbps.
• May skip maintenance during any hour as a valid move.
• Limit: Only one upgrade is allowed on one server in a single hour.

Objective

Given an integer array servers of length n, determine the minimum number of hours needed to make the bandwidth equal across all servers.

Example

n = 3
servers = [1, 2, 4]

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Tiktok Video Clusters

TikTok’s playlist curation algorithm aims to identify collections of videos that meet specific quality thresholds.

Given an array videoLengths of size n, where each element represents the length of a video, determine how many playlists containing exactly k videos meet the criteria that all videos in the playlist have lengths less than or equal to a given value, threshold.

Note: A playlist is defined as any contiguous sequence of videos from the array (subarray).

Example

n = 7
videoLengths = [3, 1, 5, 6, 8, 2, 1]
k = 2
threshold = 5

The subarrays of length 2 in which all integers are less than or equal to 5 are:

[3, 1], [1, 5], [2, 1]

Hence, there are 3 subarrays that meet the given condition.

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Function Description

Complete the function getPlaylistCount in the editor below.

getPlaylistCount has the following parameters:
int videoLengths[n]:  representing the lengths of videos  
int k:  the number of videos in a given playlist  
int threshold:  the maximum length of a video that is added in playlist  

Returns

int: the total number of playlists that can be created

Constraints

1 ≤ n ≤ 10^5  
1 ≤ videoLengths[i] ≤ 10^9  

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