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All topics›JavaScript›DP: 2D

Unique Paths II

intermediatelayer I8 · DP: 2D5 tests

Same right-and-down robot, but now the grid obstacleGrid marks blocked cells with 1 and free cells with 0. Return the number of distinct paths from the top-left to the bottom-right.

  • The robot may never enter a blocked cell
  • If the start or the finish is blocked, the answer is 0
  • An obstacle in the top row blocks everything to its right in that row, and likewise down the left column

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