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When the code scales so poorly in the face of large inputs that it cannot complete in a reasonable amount of time, use this instead of the [performance] tag.
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HackerRank "Digit sum" challenge
Here's the question:
Scanner scanner = new Scanner(System.in);
long x = scanner.nextLong();
if(x<=1) return;
if(x>=Math.pow(10, 12)) return;
Map<Integer, Long> y …