基础题笔记（一）：填数字

count=0
def dfs(n,alist):
    if n==9:
       if alist[0]*100+alist[1]*10+alist[2]+alist[3]*100+alist[4]*10+alist[5]==alist[6]*100+alist[7]*10+alist[8]:
           print(alist)
           global count
           count+=1
    for i in range(9):
        if i not in alist:
            alist.append(i)
            dfs(n+1,alist)
            alist.pop()
dfs(0,[])
print(count)