Question: ou are given a simple directed graph G with vertex set V , edge set E and vertex labels L ( v ) in {

ou are given a simple directed graph G with vertex set V , edge set E and vertex labels
L(v) in {0,1} as well as a starting and ending vertex s, t.
Design a reasonably efficient algorithm that determines if there is a walk from s to t that goes through
exactly two 0 vertices.

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