a, b = map(int, input().split())
dp = [[[0 for i in range(11)] for i in range(11)] for i in range(20)]
dp[0][10][10] = 1
for dig in range(1, 19):
for cur in range(10):
for prev in range(11):
if cur == prev:
continue
for prev2 in range(11):
if prev2 == cur:
continue
dp[dig][cur][prev] += dp[dig-1][prev][prev2]
## dig = 1
##d = 5
"""
ans = 1
for dig in range(1, d+1):
for cur in range(1, 11):
for prev in range(11):
ans += dp[dig][cur][prev]
"""
def solve(x):
if x == 0:
return 0
ans = 1
x = list(str(x))
for dig in range(1, len(x)):
for cur in range(1, 11):
for prev in range(11):
ans += dp[dig][cur][prev]
#print(ans)
chk = [11,11]
bad = False
for i, ch in enumerate(x):
#if i == len(x)-1: continue
d = len(x) - i
#print(d, ch)
val = int(ch)
for cur in range(0, val):
if bad:
continue
if chk[-1] == chk[-2] and chk[-1] != 11:
bad = True
continue
if chk[-1] == 11 and cur == 0:
continue
if cur == chk[-1] or cur == chk[-2]:
continue
for prev in range(11):
if prev == chk[-1]: continue
ans += dp[d][cur][prev]
#print(ans)
if val == chk[-2]:
bad = True
chk[-2] = chk[-1]
chk[-1] = val
return ans
print(solve(b+1)-solve(a))
"""
ans_brute = 0
for n in range(a, b+1):
st = str(n)
is_pal = False
for l in range(len(st)):
for r in range(l+2, len(st)+1):
if st[l:r] == st[l:r][::-1]:
is_pal = True
if not is_pal:
ans_brute+=1
print(ans_brute)
#print(ans, ans_brute)"""
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
49 ms |
19140 KB |
Output is correct |
| 2 |
Correct |
47 ms |
19204 KB |
Output is correct |
| 3 |
Correct |
52 ms |
19316 KB |
Output is correct |
| 4 |
Correct |
48 ms |
19120 KB |
Output is correct |
| 5 |
Correct |
47 ms |
19228 KB |
Output is correct |
| 6 |
Correct |
52 ms |
19112 KB |
Output is correct |
| 7 |
Correct |
47 ms |
19196 KB |
Output is correct |
| 8 |
Correct |
50 ms |
19212 KB |
Output is correct |
| 9 |
Correct |
73 ms |
19116 KB |
Output is correct |
| 10 |
Correct |
52 ms |
19108 KB |
Output is correct |
| 11 |
Correct |
46 ms |
19156 KB |
Output is correct |
| 12 |
Correct |
46 ms |
19220 KB |
Output is correct |
| 13 |
Correct |
48 ms |
19224 KB |
Output is correct |
| 14 |
Correct |
52 ms |
19208 KB |
Output is correct |
| 15 |
Correct |
49 ms |
19208 KB |
Output is correct |
| 16 |
Correct |
54 ms |
19264 KB |
Output is correct |
| 17 |
Correct |
50 ms |
19356 KB |
Output is correct |
| 18 |
Correct |
49 ms |
19172 KB |
Output is correct |
| 19 |
Correct |
49 ms |
19368 KB |
Output is correct |
| 20 |
Correct |
47 ms |
19208 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
55 ms |
19412 KB |
Output is correct |
| 2 |
Correct |
54 ms |
19368 KB |
Output is correct |
| 3 |
Correct |
56 ms |
19360 KB |
Output is correct |
| 4 |
Correct |
53 ms |
19368 KB |
Output is correct |
| 5 |
Correct |
57 ms |
19308 KB |
Output is correct |
| 6 |
Correct |
50 ms |
19364 KB |
Output is correct |
| 7 |
Correct |
59 ms |
19444 KB |
Output is correct |
| 8 |
Correct |
61 ms |
19368 KB |
Output is correct |
| 9 |
Correct |
58 ms |
19220 KB |
Output is correct |
| 10 |
Correct |
63 ms |
19188 KB |
Output is correct |
| 11 |
Correct |
54 ms |
19352 KB |
Output is correct |
| 12 |
Correct |
50 ms |
19332 KB |
Output is correct |
| 13 |
Correct |
51 ms |
19292 KB |
Output is correct |
| 14 |
Correct |
51 ms |
19320 KB |
Output is correct |
| 15 |
Correct |
47 ms |
19356 KB |
Output is correct |
| 16 |
Correct |
53 ms |
19324 KB |
Output is correct |
| 17 |
Correct |
52 ms |
19288 KB |
Output is correct |
| 18 |
Correct |
51 ms |
19292 KB |
Output is correct |
| 19 |
Correct |
51 ms |
19368 KB |
Output is correct |
| 20 |
Correct |
55 ms |
19320 KB |
Output is correct |
| 21 |
Correct |
50 ms |
19284 KB |
Output is correct |
| 22 |
Correct |
51 ms |
19320 KB |
Output is correct |
| 23 |
Correct |
50 ms |
19360 KB |
Output is correct |
| 24 |
Correct |
54 ms |
19328 KB |
Output is correct |
| 25 |
Correct |
55 ms |
19400 KB |
Output is correct |
| 26 |
Correct |
54 ms |
19340 KB |
Output is correct |
| 27 |
Correct |
50 ms |
19360 KB |
Output is correct |
| 28 |
Incorrect |
53 ms |
19328 KB |
Output isn't correct |
| 29 |
Correct |
50 ms |
19352 KB |
Output is correct |
| 30 |
Correct |
51 ms |
19460 KB |
Output is correct |
| 31 |
Correct |
51 ms |
19368 KB |
Output is correct |
| 32 |
Correct |
50 ms |
19376 KB |
Output is correct |
| 33 |
Correct |
56 ms |
19368 KB |
Output is correct |
| 34 |
Incorrect |
48 ms |
19336 KB |
Output isn't correct |
| 35 |
Correct |
57 ms |
19436 KB |
Output is correct |
| 36 |
Correct |
51 ms |
19364 KB |
Output is correct |
| 37 |
Correct |
52 ms |
19340 KB |
Output is correct |
| 38 |
Correct |
56 ms |
19276 KB |
Output is correct |
| 39 |
Correct |
51 ms |
19356 KB |
Output is correct |
| 40 |
Correct |
48 ms |
19316 KB |
Output is correct |
| 41 |
Correct |
57 ms |
19372 KB |
Output is correct |
| 42 |
Correct |
50 ms |
19384 KB |
Output is correct |
| 43 |
Correct |
52 ms |
19376 KB |
Output is correct |
| 44 |
Correct |
55 ms |
19344 KB |
Output is correct |
| 45 |
Correct |
58 ms |
19300 KB |
Output is correct |
