Python Basics簡単

Lowest Common Multiple (LCM)

Detailed guide and Python implementation for the 'Lowest Common Multiple (LCM)' problem.

問題提起

簡単

Write a function find_lcm(a, b) that takes two positive integers a and b and returns their Lowest Common Multiple (LCM). The LCM is the smallest positive integer that is divisible by both a and b.

Hint: You can use the relationship LCM(a, b) = (a * b) / GCD(a, b).

制約
  • 1 <= a, b <= 10^6

Example 1
Input
find_lcm(4, 6)
Output
12
Explanation

Multiples of 4: 4, 8, 12, 16, ... Multiples of 6: 6, 12, 18, ... The smallest common multiple is 12.

Example 2
Input
find_lcm(3, 5)
Output
15
Explanation

Multiples of 3: 3, 6, 9, 12, 15, ... Multiples of 5: 5, 10, 15, ... The smallest common multiple is 15.

Example 3
Input
find_lcm(12, 18)
Output
36
Explanation

GCD(12,18) = 6. LCM = (12 * 18) / 6 = 216 / 6 = 36.

Need a Hint?
Consider using Numbers-specific data structures like sets or heaps.
Edge Cases to Watch
  • Empty input structures
  • Single element inputs
  • Large numerical bounds

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