Leetcode Problem 1977. Number of Ways to Separate Numbers

1977. Number of Ways to Separate Numbers

Leetcode Solutions

Dynamic Programming with Suffix Array Optimization

  1. Preprocess the string num to create a suffix array that stores the rank of each substring.
  2. Initialize a DP table dp with dimensions [n+1][n+1], where n is the length of num.
  3. Iterate over the string num in reverse order to fill the DP table.
  4. For each position i and each possible length k, calculate dp[i][k] by checking if the substring starting at i with length k is non-zero and comparing it with the next substring of the same length using the suffix array.
  5. If the next substring is greater or equal, add the number of ways from dp[i+k][k] to dp[i][k].
  6. If the next substring is longer, add the number of ways from dp[i+k][k+1] to dp[i][k].
  7. The answer is the sum of dp[0][k] for all k.
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Dynamic Programming with Prefix Sums and String Comparison

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