比较简单的字符串拼接...

class Solution:
    def findContestMatch(self, n: int) -> str:
        l = [i for i in range(1,n+1)]
        while len(l) > 2:
            new = []
            length = len(l)
            for i in range(0,length//2):
                strs = '('+ str(l[i]) + ','+str(l[length-i-1])+')'
                new.append(strs)
                if length %2 != 0:
                    strs = '('+str(l[length//2])+')'
                    new.append(strs)
            l = new
        strs = '(' + str(l[0]) + ',' + str(l[1]) + ')'
        return strs