Leetcode Problem 1638. Count Substrings That Differ by One Character

1638. Count Substrings That Differ by One Character

Leetcode Solutions

Compare and Expand Approach

  1. Initialize a result counter res to 0.
  2. Iterate over each character index i in string s.
  3. For each i, iterate over each character index j in string t.
  4. For each pair (i, j), initialize miss to 0 and pos to 0.
  5. While i + pos is within s and j + pos is within t, do the following: a. If s[i + pos] is not equal to t[j + pos], increment miss. b. If miss is greater than 1, break the loop. c. If miss is exactly 1, increment res. d. Increment pos.
  6. Return the value of res.
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Process Mismatches with Dynamic Programming

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