Greedy Algorithms - Largest Number (Arrange to Form Biggest)
Given the sorted string list ['9', '5', '34', '3', '30'] as an intermediate state, which original input list could produce this order after applying the largest number sorting comparator?
Given the sorted string list ['9', '5', '34', '3', '30'] as an intermediate state, which original input list could produce this order after applying the largest number sorting comparator?
hard🔄 Reverse Engineer Q9 of Q15
Step-by-Step Solution
Solution:
Step 1: Recognize that sorting order is based on concatenation comparison
Order '9','5','34','3','30' matches input [3,30,34,5,9].Step 2: Verify that other options do not produce this exact sorted order
Only [3, 30, 34, 5, 9] matches the known example producing this order.Final Answer:
Option D -> Option DQuick Check:
Sorted order matches known largest number example input [OK]
Quick Trick: Sorted order corresponds to known example input [OK]
Common Mistakes:
MISTAKES- Confusing input permutations that produce different orders
Trap Explanation:
PITFALL- Candidates fail to reason backward from sorted order to original input.
Interviewer Note:
CONTEXT- Tests deep understanding of sorting comparator effect on input order.
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