Leetcode Problem 2786. Visit Array Positions to Maximize Score

2786. Visit Array Positions to Maximize Score

Leetcode Solutions

Dynamic Programming with Parity State

  1. Initialize a DP table dp with dimensions [n][2], where n is the length of nums, and the second dimension represents the parity (0 for even, 1 for odd).
  2. Fill the DP table with a default value (e.g., -1) to indicate that the state has not been computed yet.
  3. Define a recursive function maxScoreFrom that takes the current index i and the parity of the last included number.
  4. In the recursive function, check if the current index is out of bounds. If so, return 0 as the base case.
  5. If the current state has already been computed, return the stored value from the DP table.
  6. Compute the score for the two choices: including nums[i] (updating the parity if needed and subtracting x if parities differ) or not including nums[i].
  7. Store the maximum of the two choices in the DP table for the current state.
  8. Return the maximum score from the DP table for the initial state (index 0 with the parity of nums[0]).
  9. Implement the main function that initializes the DP table and calls the recursive function with the initial state.
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Greedy Approach with Priority Queue

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