Leetcode Problem 1434. Number of Ways to Wear Different Hats to Each Other

1434. Number of Ways to Wear Different Hats to Each Other

Leetcode Solutions

Top-Down Dynamic Programming with Bitmasks

  1. Initialize variables n, done, MOD, memo, and hatsToPeople.
  2. Populate hatsToPeople with the preferences of each person.
  3. Define the recursive function dp(hat, mask).
    • If mask == done, return 1.
    • If hat > 40, return 0.
    • If memo[hat][mask] is calculated, return its value.
    • Otherwise, calculate the number of ways by skipping the current hat and by placing the current hat on each person that prefers it and doesn't have a hat yet.
  4. Use memoization to store the results of dp(hat, mask).
  5. Return dp(1, 0) as the final answer.
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Bottom-Up Dynamic Programming with Bitmasks

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