Leetcode Problem 2712. Minimum Cost to Make All Characters Equal

2712. Minimum Cost to Make All Characters Equal

Leetcode Solutions

Greedy Approach with Prefix and Suffix Sum Optimization

  1. Initialize two arrays, prefixSums and suffixSums, to store the cumulative cost of inverting characters from the start and from the end of the string, respectively.
  2. Iterate through the string from left to right, updating prefixSums with the cost of inverting characters up to the current index whenever a character is different from its predecessor.
  3. Iterate through the string from right to left, updating suffixSums with the cost of inverting characters from the current index to the end of the string whenever a character is different from its successor.
  4. Initialize a variable minCost to a large value to keep track of the minimum cost found so far.
  5. Iterate through the string once more, calculating the cost of making all characters equal by combining the prefix sum up to the current index with the suffix sum from the current index to the end.
  6. Update minCost with the smaller of the current cost and the previously stored minCost.
  7. Return minCost as the final answer.
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Greedy Approach with Single Pass

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