Leetcode Problem 1643. Kth Smallest Instructions

1643. Kth Smallest Instructions

Leetcode Solutions

Combinatorics and Lexicographic Order

  1. Initialize variables for the number of horizontal (H) and vertical (V) moves left.
  2. Initialize an empty string to store the path.
  3. Loop until the path is complete (length equals row + column).
  4. At each step, calculate the number of combinations if the next move is horizontal.
  5. If the number of combinations is greater than or equal to k, append 'H' to the path and decrease the count of H.
  6. Otherwise, append 'V' to the path, decrease the count of V, and subtract the number of combinations from k.
  7. Continue until the path is complete.
  8. Return the path.
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Dynamic Programming to Precompute Combinations

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