Algorithm · Apple · Hard
This problem has three independent parts. Part 1: Repeated Digit-Square Mapping For a positive integer n, define one operation as computing the next integer by squaring each digit in the decimal representation of n and adding the results together. Apply this operation repeatedly. Return true if the process eventually reaches 1. Return false if the sequence enters a cycle that never contains 1. Example 1: Explanation: The sequence proceeds as 7 -> 49 -> 97 -> 130 -> 10 -> 1.…
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