Greedy Algorithms - Reorganize String (No Two Adjacent Same)
You are given a string and need to rearrange its characters so that no two adjacent characters are the same. Which algorithmic approach guarantees an optimal solution for this problem?
You are given a string and need to rearrange its characters so that no two adjacent characters are the same. Which algorithmic approach guarantees an optimal solution for this problem?
easy🔍 Pattern Recognition Q11 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand problem constraints
The problem requires rearranging characters so no two adjacent are the same, which demands careful ordering based on frequency.Step 2: Identify approach that guarantees optimality
Greedy approach with a max heap always picks the most frequent character available that is not the previously used one, ensuring no adjacency violation and optimal placement.Final Answer:
Option A -> Option AQuick Check:
Max heap approach is standard and optimal for this problem [OK]
Quick Trick: Max heap greedily picks highest frequency char [OK]
Common Mistakes:
MISTAKES- Assuming simple sorting suffices
- Thinking backtracking is efficient here
- Confusing DP with greedy
Trap Explanation:
PITFALL- Sorting alone fails when the most frequent char count is high; backtracking is correct but inefficient; DP is not straightforward here.
Interviewer Note:
CONTEXT- Tests if candidate can recognize the greedy max heap pattern under pressure.
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