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1810. Minimum Path Cost in a Hidden Grid (Medium)

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Hints

Hint 1

The grid is at a maximum 100 x 100, so it is clever to assume that the robot's initial cell is grid[101][101]

Hint 2

Run a DFS from the robot's position to make sure that you can reach the target, otherwise you should return -1.

Hint 3

Now that you are sure you can reach the target and that you know the grid, run Dijkstra to find the minimum cost.