Leetcode Problem 2698. Find the Punishment Number of an Integer

2698. Find the Punishment Number of an Integer

Leetcode Solutions

Backtracking Partition Check

  1. Initialize a variable punishmentNumber to store the sum of squares of valid numbers.
  2. Iterate through numbers from 1 to n.
  3. For each number i, calculate i * i and convert it to a string squareStr.
  4. Call a backtracking function isValidPartition with parameters squareStr, the current index 0, the target number i, and a running sum 0.
  5. If isValidPartition returns true, add i * i to punishmentNumber.
  6. Return the final value of punishmentNumber.
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Iterative Substring Sum Check

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