'''
Bear Bill wants to become the largest of bears, or at least to become larger than his brother Bob. Right now, Bill and Bob weigh a and b 
respectively. It's guaranteed that Bill's weight is smaller than or equal to his brother's weight. Bill eats a lot and his weight is tripled 
after every year, while Bob's weight is doubled after every year. After how many full years will Bill become strictly heavier than Bob?

Example 1
Input:
a = 4; b = 7
Output:
2
'''

class Solution(object):
    def solve(self, a: int, b: int) -> int:
        print("Initial weights - Bill:", a, "Bob:", b)
        years = 0
        while a <= b:
            a *= 3
            b *= 2
            years += 1
            print(f"After year {years}: Bill's weight = {a}, Bob's weight = {b}")
        return years

s = Solution()
print(s.solve(4, 8))  # Output: 2