How should I practice Maximum 69 Number?

Start by reading the full statement, solve the visible examples, then compare the pattern against related HSBC onsite interview problems in FastPrep.

Is Maximum 69 Number associated with HSBC?

FastPrep tags this as a HSBC onsite interview coding practice problem when the problem catalog has that company and stage context.

HSBC● EasyNEW GRADONSITE INTERVIEW

You are given a positive integer whose decimal digits are only 6 and 9. Change at most one digit and return the largest possible integer.

maximum69Number(num: int) → int

num = 9669return = 9969

Changing the first six produces the largest result.

num = 9999return = 9999

No change can improve the number.

Source note: Author-written prompt excerpt retained for source fidelity.