题解 | 约瑟夫环

n, k, m = map(int, input().split())
a = list(range(n))
label = (k+m-1) % n
a = a[:label]+a[label+1:]
for i in range(2,n):
    label = (label+m-1) % (n-i+1)
    a = a[:label]+a[label+1:]
print(a[0])