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Prove that if the breadth-first search algorithm visits node u before node v, then u.d ≤...

Prove that if the breadth-first search algorithm visits node u before node v, then u.d ≤ v.d. Give a simple direct proof. Use induction on when v is visited. More precisely, prove, for every i ≥ 1, that if v is the ith node visited and u is visited before v, then u.d ≤ v.d.

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