Leetcode Problem 413. Arithmetic Slices

413. Arithmetic Slices

Leetcode Solutions

Using Formula

  1. Initialize sum to 0 to keep track of the total number of arithmetic subarrays.
  2. Initialize count to 0 to keep track of the current run of consecutive elements forming an arithmetic subarray.
  3. Iterate through the array starting from the second element.
  4. For each element, check if it continues the arithmetic subarray from the previous element (i.e., nums[i] - nums[i-1] is the same as nums[i-1] - nums[i-2]).
  5. If it does, increment count.
  6. If it does not, add count * (count + 1) / 2 to sum, and reset count to 0.
  7. After the loop, add the last count * (count + 1) / 2 to sum to account for the last run.
  8. Return sum.
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