题解 | 旺仔哥哥转圈圈

class Solution:
    def stopAtWho(self , a: List[int], m: int) -> int:
        # write code here
        k = 0
        for i in range(m):
            # k = (k - a[k]) % len(a)
            
            # 下面的和上面一行等价
            k = (k - a[k])
            while k < 0:
                k += len(a)
        return k + 1