题解 | #放苹果#

dt={}
def apple(m,n):
    total=0
    if (m,n) in dt:
        return dt[m,n]
    elif m<0 or n <0:
        return 0
    elif m==1 or n==1:
        return 1
    else:
        total+=apple(m,n-1)+apple(m-n,n)
    dt[m,n]=total  
    return total

while True:
    try:
        m,n=list(map(int,input().split()))
        print(apple(m,n))
    
    except:
        break