Apr 20: Fréchet distance continued

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Decision problem: Free space is convex in each cell
Weak Fréchet distance: Replace free space in each cell with convex hull of free boundary segments
Finding reachable points on grid boundary by dynamic programming
Optimization: Vertex-edge and monotonicity events
Sketch of parametric search
Random sampling and sweeping: O(n^2 log n) time with high probability
FrechetView demo

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