Leetcode Problem 2742. Painting the Walls

2742. Painting the Walls

Leetcode Solutions

Approach: Top-Down Dynamic Programming

  1. Define a memoized function dp(i, remain) that returns the minimum cost to paint remain walls starting from index i.
  2. If remain <= 0, return 0 as the base case.
  3. If i == n, return a large value (infinity) as the base case.
  4. Calculate the cost if we pay the painter for the ith wall: paint = cost[i] + dp(i + 1, remain - 1 - time[i]).
  5. Calculate the cost if we do not pay the painter for the ith wall: dontPaint = dp(i + 1, remain).
  6. Return the minimum of paint and dontPaint.
  7. Use memoization to store the results of subproblems.
  8. The solution to the problem is dp(0, n).
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Approach: Bottom-Up Dynamic Programming

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