Leetcode Problem 1496. Path Crossing

1496. Path Crossing

Leetcode Solutions

Detecting Path Crossing Using Hash Set

  1. Create a hash map moves that maps characters N, S, W, E to their respective coordinate changes.
  2. Initialize a hash set visited with the starting point (0, 0).
  3. Initialize variables x and y to 0 to represent the starting coordinates.
  4. Iterate over each character c in path: a. Retrieve the corresponding coordinate change (dx, dy) from moves. b. Update the current coordinates: x += dx and y += dy. c. Check if the new coordinates (x, y) are already in visited:
    • If yes, return true as the path crosses itself.
    • If no, add (x, y) to visited.
  5. If the loop completes without finding a crossing, return false.
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Detecting Path Crossing Using Coordinate Traversal

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