Leetcode Problem 1573. Number of Ways to Split a String

1573. Number of Ways to Split a String

Leetcode Solutions

Counting Combinations of Split Indices

  1. Initialize a variable to store the count of ones in the string.
  2. Traverse the string to count the total number of ones.
  3. If the count of ones is zero, calculate the number of ways to split the string using the combinatorial formula (n-1)*(n-2)/2, where n is the length of the string.
  4. If the count of ones is not divisible by three, return 0.
  5. If the count of ones is divisible by three, traverse the string again to find the indices where the one-third and two-third of the total ones are located.
  6. Calculate the number of ways to make the first and second cuts based on the number of zeros between these indices.
  7. Return the product of the number of ways to make the first and second cuts, modulo 10^9 + 7.
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Prefix Sum and Combinatorial Approach

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