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Git-Leon 6 years ago
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 * **Restrictions**
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 * **Restrictions**
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     * No use of any built-in data structures, (`Collection`, `List`, `Map`)
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     * No use of any built-in data structures, (`Collection`, `List`, `Map`)
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     * Operations should be [idempotent](https://stackoverflow.com/questions/1077412/what-is-an-idempotent-operation)
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     * Operations should be [idempotent](https://stackoverflow.com/questions/1077412/what-is-an-idempotent-operation)
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-        * The output of the methods should always be the same, regardless of how many times the method is called.
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+        * If the input is the same, then the outputs of the methods should **always** be the same, regardless of how many times the method is called.
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