Leetcode Problem 1630. Arithmetic Subarrays

1630. Arithmetic Subarrays

Leetcode Solutions

Approach: No Sorting

  1. Define a function check(arr) that takes a subarray arr and determines if it can form an arithmetic sequence.
  2. Find the minimum and maximum elements in arr.
  3. Calculate the expected difference diff as (maxElement - minElement) / (arr.length - 1).
  4. If diff is not an integer, return false.
  5. Convert arr into a hash set for efficient lookups.
  6. Initialize curr as minElement + diff.
  7. While curr is less than maxElement, check if curr is in the hash set. If not, return false. Increment curr by diff.
  8. If the loop completes without returning false, return true.
  9. Iterate over the range queries and apply check to each subarray formed by l[i] to r[i].
  10. Return the list of boolean results.
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Approach: Sort and Check

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