a,b = raw_input().split()
c = 0
count = 0
while c<int(a):
    c+=1
    for i in range(len(str(c))):
        if str(c)[i] == b:count+=1
print count

为什么会时间超限啊啊啊？！求大神指教

a,b = raw_input().split()
count = 0
for i in range(1,int(a)+1):
c = str(i)
for j in c:
if b in j:
count += 1
print count

这样也不行 时间还是超限