Leetcode Problem 651. 4 Keys Keyboard

651. 4 Keys Keyboard

Leetcode Solutions

Dynamic Programming Approach for Special Keyboard Problem

  1. Initialize an array dp of length n + 1 with dp[i] = i for all i.
  2. Iterate over the dp array starting from index 1 up to n - 3.
  3. For each index i, consider the operations of Ctrl-A, Ctrl-C, and then Ctrl-V up to four times.
  4. For each possible number of pastes (from 1 to 4), calculate the number of 'A's that would result and update dp[j] where j = i + 3 + number_of_pastes.
  5. Ensure that dp[j] is updated with the maximum value by comparing it with the newly calculated number of 'A's.
  6. After filling the dp array, return dp[n] as the answer.
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Recursive Approach with Memoization for Special Keyboard Problem

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