Reconstruct Itinerary
Given tickets array where each [from, to] is a flight Start from "JFK" and return itinerary in lexical order Example: [["MUC","LHR"],["JFK","MUC"],["SFO","SJC"],["LHR","SFO"]] => ["JFK","MUC","LHR","SFO","SJC"]
Reconstruct Itinerary rewards structured search and good pruning more than raw cleverness. It's a hard one for a reason: it stresses structured exploration when the rules pile up. The gotcha is duplicates and dead ends—good pruning and ordering rules make this manageable.
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