What is a Happy Number? (This is a question that is asked often in Coding Interviews and also in programming assignments in schools and college courses) A Happy Number is a number where the sum of di…
Check for a Perfect Number A perfect number is a number that is equal to the sum of its proper divisors. Eg 6 is a perfect number because its proper divisors are 1, 2 and 3 where 1+2+3=6. Another pe…
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✅ Java Tip: Use Streams API for data filtering and mapping. Example: Listresult = list.stream() .filter(s -> s.startsWith("A")) .collect(Collectors.toList());
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