Which of the following approaches correctly adapts the algorithm to find the minimum number of partitions such that each partition contains unique characters (no repeats within the partition)?

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Greedy Algorithms - Partition Labels

Suppose the problem is modified so that characters can be reused in multiple partitions (i.e., the constraint that each letter appears in at most one part is removed). Which of the following approaches correctly adapts the algorithm to find the minimum number of partitions such that each partition contains unique characters (no repeats within the partition)?

AUse backtracking to try all partitions and select the minimal count

BUse the original greedy approach with last occurrence map unchanged

CUse a sliding window approach expanding partitions until a repeated character is found, then start a new partition

DSort characters by frequency and greedily assign them to partitions

Step-by-Step Solution

Solution:

Step 1: Understand new constraint
Characters can appear in multiple partitions, but no repeats allowed within a partition.
Step 2: Identify suitable approach
Sliding window expanding until a repeated character is found ensures partitions with unique characters; then start a new partition.
Step 3: Why original greedy fails
Original approach relies on last occurrence to avoid repeats across partitions, which is irrelevant here.
Final Answer:
Option C -> Option C
Quick Check:
Sliding window detects repeats within partition, minimal partitions formed [OK]

Quick Trick: Sliding window for unique chars per partition [OK]

Common Mistakes:

MISTAKES

Using last occurrence map which is irrelevant here
Trying backtracking which is inefficient
Sorting characters which doesn't solve partitioning

Trap Explanation:

PITFALL

Original greedy approach breaks because it assumes no character reuse across partitions.

Interviewer Note:

CONTEXT

Tests candidate's ability to adapt algorithm to relaxed constraints and recognize pattern shift.

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More Greedy Algorithms Quizzes

Which of the following approaches correctly adapts the algorithm to find the minimum number of partitions such that each partition contains unique characters (no repeats within the partition)?

Step 1: Understand new constraint

Step 2: Identify suitable approach

Step 3: Why original greedy fails

Final Answer:

Quick Check:

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