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Quick Summary
Replace up to k non-'5' digits with '5' to maximize the resulting number.
Prioritize changing smaller digits in more significant (leftmost) positions first.
Return an empty string if k exceeds the total count of replaceable digits.
What This Tests
Greedy algorithm design and local-optimal decision making
Understanding place value impact on numeric magnitude
String iteration and character comparison techniques
Pre-validation and edge case handling
Common Patterns
Greedy
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