Leetcode Problem 1737. Change Minimum Characters to Satisfy One of Three Conditions

1737. Change Minimum Characters to Satisfy One of Three Conditions

Leetcode Solutions

Counting and Prefix Sum Approach

  1. Initialize two arrays c1 and c2 of size 26 to store the frequency of each character in a and b respectively.
  2. Iterate over both strings to populate the frequency arrays.
  3. Initialize a variable res to a large value to keep track of the minimum operations.
  4. Iterate over the frequency arrays to calculate the minimum operations for condition 3 (both strings consist of only one distinct letter).
  5. Use prefix sums to accumulate the frequencies in c1 and c2.
  6. Iterate from 0 to 24 (not including 'z') to calculate the minimum operations for conditions 1 and 2 (every letter in a is strictly less than every letter in b and vice versa).
  7. Return the minimum value of res.
UML Thumbnail

Brute Force Approach

Ask Question

Programming Language
image/screenshot of info(optional)
Full Screen
Loading...

Suggested Answer

Answer
Full Screen
Copy Answer Code
Loading...