Leetcode: Maximum Gap

Maximum Gap

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Similar Problems:

Given an unsorted array, find the maximum difference between the successive elements in its sorted form.

Try to solve it in linear time/space.

Return 0 if the array contains less than 2 elements.

You may assume all elements in the array are non-negative integers and fit in the 32-bit signed integer range.

Github: code.dennyzhang.com

Credits To: leetcode.com

Leave me comments, if you have better ways to solve.

  • Solution: bucket sort

General Thinkings:

Put each element into a list of buckets. Each bucket track the min and max.

The scan the bucket kist, we get the maximum gap.

Some improvements:
To get the mininum bucket count, we avoid placing min and max into any buckets.

Bucket count: n-1, bucket size: int((max-min)/(n-1))

Walk Through Testdata

Leetcode: Maximum Gap

Key Observations:

- Duplicate elements doesn't matter
- Instead of total order, we maintain partial order in bucket-sort. 
  Actually we don't even sort. We can compare items with pilots
// Blog link: https://code.dennyzhang.com/maximum-gap

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