/**
* author: zhougz
* created: 23/12/2021 10:31:38
**/
#include <bits/stdc++.h>
using namespace std;
long long memo[21][10][10][2];
int d[21];
long long dp(int len, int first, int second, int bounded) {
if (len <= 2) {
return 1;
}
long long &res = memo[len][first][second][bounded];
if (res != -1) {
return res;
}
res = 0;
if (!bounded) {
for (int i = 0; i <= 9; i++) {
if (i == first || i == second) {
continue;
}
res += dp(len - 1, second, i, false);
}
return res;
}
for (int i = 0; i <= d[len - 2]; i++) {
if (i == first || i == second) {
continue;
}
res += dp(len - 1, second, i, i == d[len - 2]);
}
return res;
}
long long slv(long long x) {
memset(memo, -1, sizeof memo);
memset(d, 0, sizeof d);
int len = 0;
do { // In case x == 0
d[++len] = x % 10;
x /= 10;
} while (x != 0);
long long res = 1;
for (int i = 2; i <= len; i++) {
for (int j = 1; j <= 9; j++) {
res += dp(i, j, j, false);
}
}
for (int j = 1; j <= d[len]; j++) {
res += dp(len + 1, j, j, j == d[len]);
}
return res;
}
int main()
{
ios::sync_with_stdio(false);
cin.tie(0);
long long a, b;
cin >> a >> b;
cout << slv(b) - (a != 0 ? slv(a - 1) : 0) << '\n';
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
292 KB |
Output is correct |
| 2 |
Correct |
0 ms |
312 KB |
Output is correct |
| 3 |
Correct |
0 ms |
332 KB |
Output is correct |
| 4 |
Correct |
0 ms |
332 KB |
Output is correct |
| 5 |
Correct |
1 ms |
316 KB |
Output is correct |
| 6 |
Correct |
0 ms |
332 KB |
Output is correct |
| 7 |
Correct |
1 ms |
316 KB |
Output is correct |
| 8 |
Correct |
0 ms |
292 KB |
Output is correct |
| 9 |
Correct |
0 ms |
332 KB |
Output is correct |
| 10 |
Correct |
0 ms |
316 KB |
Output is correct |
| 11 |
Correct |
0 ms |
332 KB |
Output is correct |
| 12 |
Correct |
0 ms |
332 KB |
Output is correct |
| 13 |
Correct |
0 ms |
332 KB |
Output is correct |
| 14 |
Correct |
0 ms |
332 KB |
Output is correct |
| 15 |
Correct |
0 ms |
316 KB |
Output is correct |
| 16 |
Correct |
1 ms |
204 KB |
Output is correct |
| 17 |
Correct |
1 ms |
332 KB |
Output is correct |
| 18 |
Correct |
0 ms |
332 KB |
Output is correct |
| 19 |
Correct |
1 ms |
332 KB |
Output is correct |
| 20 |
Correct |
0 ms |
332 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
332 KB |
Output is correct |
| 2 |
Correct |
0 ms |
332 KB |
Output is correct |
| 3 |
Correct |
1 ms |
332 KB |
Output is correct |
| 4 |
Correct |
1 ms |
308 KB |
Output is correct |
| 5 |
Correct |
0 ms |
332 KB |
Output is correct |
| 6 |
Correct |
1 ms |
332 KB |
Output is correct |
| 7 |
Correct |
1 ms |
332 KB |
Output is correct |
| 8 |
Correct |
0 ms |
332 KB |
Output is correct |
| 9 |
Correct |
1 ms |
332 KB |
Output is correct |
| 10 |
Correct |
0 ms |
332 KB |
Output is correct |
| 11 |
Correct |
1 ms |
332 KB |
Output is correct |
| 12 |
Correct |
1 ms |
332 KB |
Output is correct |
| 13 |
Correct |
0 ms |
332 KB |
Output is correct |
| 14 |
Correct |
0 ms |
332 KB |
Output is correct |
| 15 |
Correct |
1 ms |
316 KB |
Output is correct |
| 16 |
Correct |
1 ms |
332 KB |
Output is correct |
| 17 |
Correct |
0 ms |
332 KB |
Output is correct |
| 18 |
Correct |
1 ms |
332 KB |
Output is correct |
| 19 |
Correct |
0 ms |
332 KB |
Output is correct |
| 20 |
Correct |
1 ms |
312 KB |
Output is correct |
| 21 |
Correct |
1 ms |
332 KB |
Output is correct |
| 22 |
Correct |
1 ms |
332 KB |
Output is correct |
| 23 |
Correct |
1 ms |
332 KB |
Output is correct |
| 24 |
Correct |
1 ms |
332 KB |
Output is correct |
| 25 |
Correct |
1 ms |
424 KB |
Output is correct |
| 26 |
Correct |
1 ms |
332 KB |
Output is correct |
| 27 |
Correct |
1 ms |
332 KB |
Output is correct |
| 28 |
Correct |
1 ms |
332 KB |
Output is correct |
| 29 |
Correct |
1 ms |
332 KB |
Output is correct |
| 30 |
Correct |
0 ms |
332 KB |
Output is correct |
| 31 |
Correct |
1 ms |
316 KB |
Output is correct |
| 32 |
Correct |
0 ms |
332 KB |
Output is correct |
| 33 |
Correct |
1 ms |
332 KB |
Output is correct |
| 34 |
Correct |
1 ms |
332 KB |
Output is correct |
| 35 |
Correct |
0 ms |
332 KB |
Output is correct |
| 36 |
Correct |
0 ms |
332 KB |
Output is correct |
| 37 |
Correct |
1 ms |
316 KB |
Output is correct |
| 38 |
Correct |
1 ms |
332 KB |
Output is correct |
| 39 |
Correct |
0 ms |
332 KB |
Output is correct |
| 40 |
Correct |
1 ms |
332 KB |
Output is correct |
| 41 |
Correct |
1 ms |
332 KB |
Output is correct |
| 42 |
Correct |
1 ms |
332 KB |
Output is correct |
| 43 |
Correct |
1 ms |
320 KB |
Output is correct |
| 44 |
Correct |
1 ms |
332 KB |
Output is correct |
| 45 |
Correct |
0 ms |
332 KB |
Output is correct |
