题解 | 约瑟夫环

n, k, m = map(int, input().split())
people = list(range(n))
index = k % n  # 起始位置 
while len(people) > 1:
    # 计算待移除位置 
    index = (index + m - 1) % len(people)  
    people.pop(index)   # 按索引移除 
print(people[0])