Two bus lines leave the same station at minute 0. Line A departs every a minutes and line B every b minutes. Write next_meeting(a, b) that returns the first minute after 0 when both lines depart together.
Examples
Input: a = 4, b = 6
Output: 12
Input: a = 5, b = 7
Output: 35
Constraints
1 <= a, b <= 10**6
Goals
- Compute a least common multiple
- Reuse gcd to get lcm without overflow-style loops