Leetcode Problem 1494. Parallel Courses II

1494. Parallel Courses II

Leetcode Solutions

Bitmasking and Dynamic Programming

  1. Initialize a bitmask to represent all courses not taken.
  2. Create a recursive function that takes the current state bitmask and returns the minimum number of semesters needed.
  3. In the recursive function, check if the current state is in the memoization table. If so, return the stored value.
  4. Find all courses that have no prerequisites or whose prerequisites are already taken, based on the current state.
  5. Generate all combinations of courses that can be taken in the current semester, limited by k.
  6. For each combination, calculate the new state by marking the selected courses as taken and recursively call the function for the new state.
  7. Take the minimum of all recursive calls plus one (for the current semester) and store it in the memoization table.
  8. The initial call to the recursive function is with the bitmask representing all courses not taken.
  9. Return the result of the initial call.
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Topological Sort and Greedy Approach

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