0

Two approaches solve Partition Labels: (1) Using a dictionary for last occurrences, (2) Using a fixed-size array for last occurrences. When is approach (1) preferable over (2)?

hard⚖️ Approach Comparison Q8 of Q15

Greedy Algorithms - Partition Labels

Two approaches solve Partition Labels: (1) Using a dictionary for last occurrences, (2) Using a fixed-size array for last occurrences. When is approach (1) preferable over (2)?

AWhen the input string contains only lowercase letters a-z

BWhen the input string is very large and performance is critical

CWhen the character set is large or unknown, e.g., Unicode

DWhen memory usage must be minimized regardless of input

Step-by-Step Solution

Solution:

Step 1: Compare data structures
Fixed-size array is efficient for small fixed alphabets (a-z), but limited to known size.
Step 2: Identify scenario for dictionary
Dictionary handles large or unknown character sets (Unicode), adapting dynamically.
Final Answer:
Option C -> Option C
Quick Check:
Dictionary preferred for large/unknown alphabets [OK]

Quick Trick: Use dict for large/unknown alphabets [OK]

Common Mistakes:

MISTAKES

Assuming array always better
Ignoring character set size
Confusing memory and speed trade-offs

Trap Explanation:

PITFALL

Candidates often overlook character set size and assume fixed array is always best.

Interviewer Note:

CONTEXT

Tests trade-off reasoning between data structures.

Master "Partition Labels" in Greedy Algorithms

3 interactive learning modes - each teaches the same concept differently

Try It Solution Trace

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions

More Greedy Algorithms Quizzes