#include <bits/stdc++.h>
using namespace std;
using ll = long long;
ll a, b, dp[20][11][11][11];
vector<ll> get_digits(ll k) {
vector<ll> ret;
ll len = log10(k) + 1;
for(int i = 0; i < len; i++) {
ret.push_back(k % 10);
k /= 10;
}
reverse(ret.begin(), ret.end());
return ret;
}
ll pf_leq(ll k) {
if(k <= 9) return k+1;
ll len = log10(k)+1;
vector<ll> digits = get_digits(k);
memset(dp, 0, sizeof(dp));
for(int p0 = 0; p0 <= 9; p0++) dp[len-1][p0][10][10] = 1;
for(int i = len-2; i >= 0; i--) {
for(int p0 = 0; p0 <= 9; p0++) {
for(int p1 = 0; p1 <= 9; p1++) if(p0 != p1) {
if(i+2 < len) {
for(int p2 = 0; p2 <= 9; p2++) if(p2 != p1 && p2 != p0) {
if(i+3 < len) for(int p3 = 0; p3 <= 9; p3++) {
dp[i][p0][p1][p2] += dp[i+1][p1][p2][p3];
} else {
dp[i][p0][p1][p2] += dp[i+1][p1][p2][10];
}
// cout << i << ' ' << p0 << ' ' << p1 << ' ' << p2 << ' ' << dp[i][p0][p1][p2] << endl;
}
} else {
dp[i][p0][p1][10] += dp[i+1][p1][10][10];
}
}
}
}
ll ret = 0;
// cout << digits[0] << endl;
for(int i = 0; i < len; i++) {
if((i >= 2 && digits[i-1] == digits[i-2]) || (i >= 3 && digits[i-1] == digits[i-3])) break;
for(int p0 = (i == 0); p0 <= (i == len-1 ? digits[i] : digits[i]-1); p0++) if((i == 0 || p0 != digits[i-1]) && (i <= 1 || p0 != digits[i-2])) {
for(int p1 = 0; p1 <= 10; p1++) if(p1 != p0 && (i == 0 || p1 != digits[i-1])) {
for(int p2 = 0; p2 <= 10; p2++) if((i == len-1 || p2 != p1) && p2 != p0) {
ret += dp[i][p0][p1][p2];
// cout << i << ' ' << p0 << ' ' << p1 << ' ' << p2 << ' ' << dp[i][p0][p1][p2] << endl;
}
}
}
}
return ret;
}
int main() {
cin >> a >> b;
ll pa = log10(a-1), pb = log10(b);
ll curra = 1, currb = 1;
ll resa = 0, resb = 0;
for(int i = 1; i <= pa; i++) {
curra *= 10;
resa += pf_leq(curra-1);
}
for(int i = 1; i <= pb; i++) {
currb *= 10;
resb += pf_leq(currb-1);
}
resa += pf_leq(a-1);
resb += pf_leq(b);
cout << resb - resa;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
504 KB |
Output is correct |
| 2 |
Correct |
2 ms |
504 KB |
Output is correct |
| 3 |
Correct |
4 ms |
664 KB |
Output is correct |
| 4 |
Correct |
2 ms |
664 KB |
Output is correct |
| 5 |
Correct |
2 ms |
664 KB |
Output is correct |
| 6 |
Correct |
2 ms |
664 KB |
Output is correct |
| 7 |
Correct |
2 ms |
712 KB |
Output is correct |
| 8 |
Correct |
2 ms |
732 KB |
Output is correct |
| 9 |
Correct |
2 ms |
732 KB |
Output is correct |
| 10 |
Correct |
2 ms |
732 KB |
Output is correct |
| 11 |
Correct |
2 ms |
748 KB |
Output is correct |
| 12 |
Correct |
2 ms |
804 KB |
Output is correct |
| 13 |
Correct |
2 ms |
804 KB |
Output is correct |
| 14 |
Correct |
2 ms |
804 KB |
Output is correct |
| 15 |
Correct |
2 ms |
804 KB |
Output is correct |
| 16 |
Correct |
2 ms |
804 KB |
Output is correct |
| 17 |
Correct |
2 ms |
804 KB |
Output is correct |
| 18 |
Correct |
1 ms |
804 KB |
Output is correct |
| 19 |
Correct |
5 ms |
804 KB |
Output is correct |
| 20 |
Correct |
2 ms |
804 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
804 KB |
Output is correct |
| 2 |
Correct |
5 ms |
804 KB |
Output is correct |
| 3 |
Correct |
5 ms |
804 KB |
Output is correct |
| 4 |
Correct |
6 ms |
804 KB |
Output is correct |
| 5 |
Correct |
2 ms |
804 KB |
Output is correct |
| 6 |
Correct |
2 ms |
804 KB |
Output is correct |
| 7 |
Correct |
2 ms |
804 KB |
Output is correct |
| 8 |
Correct |
2 ms |
804 KB |
Output is correct |
| 9 |
Correct |
2 ms |
804 KB |
Output is correct |
| 10 |
Correct |
2 ms |
804 KB |
Output is correct |
| 11 |
Correct |
3 ms |
804 KB |
Output is correct |
| 12 |
Correct |
2 ms |
804 KB |
Output is correct |
| 13 |
Correct |
2 ms |
804 KB |
Output is correct |
| 14 |
Correct |
2 ms |
804 KB |
Output is correct |
| 15 |
Correct |
2 ms |
804 KB |
Output is correct |
| 16 |
Correct |
4 ms |
804 KB |
Output is correct |
| 17 |
Correct |
4 ms |
804 KB |
Output is correct |
| 18 |
Correct |
4 ms |
812 KB |
Output is correct |
| 19 |
Correct |
4 ms |
812 KB |
Output is correct |
| 20 |
Correct |
5 ms |
812 KB |
Output is correct |
| 21 |
Correct |
5 ms |
812 KB |
Output is correct |
| 22 |
Correct |
4 ms |
812 KB |
Output is correct |
| 23 |
Correct |
4 ms |
812 KB |
Output is correct |
| 24 |
Correct |
4 ms |
812 KB |
Output is correct |
| 25 |
Correct |
4 ms |
812 KB |
Output is correct |
| 26 |
Correct |
5 ms |
812 KB |
Output is correct |
| 27 |
Correct |
5 ms |
812 KB |
Output is correct |
| 28 |
Correct |
5 ms |
812 KB |
Output is correct |
| 29 |
Correct |
5 ms |
812 KB |
Output is correct |
| 30 |
Correct |
4 ms |
812 KB |
Output is correct |
| 31 |
Correct |
4 ms |
812 KB |
Output is correct |
| 32 |
Correct |
4 ms |
812 KB |
Output is correct |
| 33 |
Correct |
4 ms |
876 KB |
Output is correct |
| 34 |
Correct |
4 ms |
876 KB |
Output is correct |
| 35 |
Correct |
4 ms |
876 KB |
Output is correct |
| 36 |
Correct |
5 ms |
876 KB |
Output is correct |
| 37 |
Correct |
4 ms |
876 KB |
Output is correct |
| 38 |
Correct |
6 ms |
876 KB |
Output is correct |
| 39 |
Correct |
6 ms |
876 KB |
Output is correct |
| 40 |
Correct |
6 ms |
876 KB |
Output is correct |
| 41 |
Correct |
4 ms |
876 KB |
Output is correct |
| 42 |
Correct |
5 ms |
876 KB |
Output is correct |
| 43 |
Correct |
4 ms |
876 KB |
Output is correct |
| 44 |
Correct |
4 ms |
876 KB |
Output is correct |
| 45 |
Correct |
5 ms |
876 KB |
Output is correct |
