Leetcode Problem 2834. Find the Minimum Possible Sum of a Beautiful Array

2834. Find the Minimum Possible Sum of a Beautiful Array

Leetcode Solutions

Excluding Target Halves Approach

  1. Calculate the number of elements to exclude, which is target/2 - 1 if target is even, or target/2 if target is odd.
  2. Calculate the sum of the first n natural numbers using the formula n * (n + 1) / 2.
  3. Calculate the sum of the first excluded natural numbers using the same formula.
  4. Calculate the sum of the excluded numbers at the end of the sequence starting from target.
  5. Subtract the sum of the excluded numbers from the sum of the first n natural numbers and add the sum of the excluded numbers at the end.
  6. Return the final sum modulo 10^9 + 7.
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Iterative Exclusion Approach

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