Leetcode Problem 1849. Splitting a String Into Descending Consecutive Values

1849. Splitting a String Into Descending Consecutive Values

Leetcode Solutions

Backtracking with Early Stopping

  1. Define a recursive function dfs that takes the current index i, the number of splits n, and the previous numerical value p as arguments.
  2. If i is equal to the length of the string and n is greater than 1, return True as we have successfully split the string.
  3. Iterate over the string starting from index i to the end of the string.
  4. Convert the current substring s[i:j+1] to an integer v.
  5. If p is None (first split) or v is exactly one less than p, recursively call dfs with j + 1, n + 1, and v.
  6. If the recursive call returns True, propagate the True value up the call stack.
  7. If no split is valid, return False.
  8. Call dfs with initial parameters 0, 0, and None and return its result.
UML Thumbnail

Iterative Splitting with Queue

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