LC 1688

Math
Math
Publish Date:   2022-07-26

Solution to LeetCode 1688 Count of Matches in Tournament.

LeetCode 1688

Count of Matches in Tournament (Easy). [link]

1] Mimic the process in the problem statement.

class Solution(object):
    def numberOfMatches(self, n):
        """
        :type n: int
        :rtype: int
        """
        ans = 0
        while n > 1:
            if n % 2 == 0: # even
                ans += n // 2
                n //= 2
            else:
                ans += (n-1) // 2
                n = (n-1) // 2 + 1
        return ans

2] Math trick. n-1 teams fail, so there are n-1 rounds of tournament.

class Solution(object):
    def numberOfMatches(self, n):
        """
        :type n: int
        :rtype: int
        """
        return n-1
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