Daily question 1688 Number of matches in the competition

topic ： The game has n A team , Eliminate half of each round , If n Is odd , So many teams are directly promoted .

Find the total number of games .

Explain ：（ simulation ）

class Solution:
    def numberOfMatches(self, n: int) -> int:
        res = 0
        while n > 1:
            res += n//2
            n = (n+1) // 2
        return res