Leetcode Problem 2223. Sum of Scores of Built Strings

2223. Sum of Scores of Built Strings

Leetcode Solutions

Z-Algorithm Approach

  1. Initialize an array z of the same length as the input string s, with all elements set to 0.
  2. Initialize variables l and r to 0. These will represent the left and right boundaries of the window of the last known prefix.
  3. Iterate over the string from index 1 to the end: a. If the current index i is within the window defined by l and r, set z[i] to the minimum of z[i-l] and r-i+1. b. While the substring starting at i+z[i] matches the prefix of s, increment z[i]. c. If i+z[i]-1 is greater than r, update l to i and r to i+z[i]-1.
  4. Sum up all the values in the z array and add the length of s to get the final score.
  5. Return the final score.
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Prefix Hashing Approach

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