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Leetcode Problem 920. Number of Music Playlists

920. Number of Music Playlists

Leetcode Solutions

Approach: Bottom-up Dynamic Programming

  1. Initialize a two-dimensional DP table dp[goal + 1][n + 1] with zeros.
  2. Set dp[0][0] to 1.
  3. Iterate i from 1 to goal.
    • Within this loop, iterate j from 1 to min(i, n).
    • Calculate the number of new playlists by adding a new song and update dp[i][j].
    • If j > k, calculate the number of new playlists by replaying an old song and update dp[i][j].
  4. Return the value of dp[goal][n].
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Approach: Top-down Dynamic Programming (Memoization)

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