Route Construction

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OzonVKTinkoff

We have a set of tickets of the form:

[
        { from: 'London', to: 'Moscow' },
        { from: 'NY', to: 'London' },
        { from: 'Moscow', to: 'SPb' },
        ...
    ]

From these tickets, we can build a single, continuous route. There are no loops or repetitions in the route. You need to write a program that returns these same ticket objects in the order they appear in the route.

Examples:

Input 1: [ { from: "C", to: "D" }, { from: "B", to: "C" }, { from: "A", to: "B" }, { from: "D", to: "E" } ]

Output 1: [ { from: "A", to: "B" }, { from: "B", to: "C" }, { from: "C", to: "D" }, { from: "D", to: "E" } ]

Input 2: [ { from: "London", to: "Moscow" }, { from: "NY", to: "London" }, { from: "Moscow", to: "SPb" } ]

Output 2: [ { from: "NY", to: "London" }, { from: "London", to: "Moscow" }, { from: "Moscow", to: "SPb" } ]

Input 3: [ { from: "London", to: "Moscow" }, { from: "Tokio", to: "NY" }, { from: "NY", to: "London" }, { from: "SPb", to: "Berlin" }, { from: "Moscow", to: "SPb" } ]

Output 3: [ { from: "Tokio", to: "NY" }, { from: "NY", to: "London" }, { from: "London", to: "Moscow" }, { from: "Moscow", to: "SPb" }, { from: "SPb", to: "Berlin" } ]

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