#include<bits/stdc++.h>
using namespace std;
#define int long long
#define maxl 20
int dp[maxl][10][10],power[maxl];
int f(int len,int p,int q){
if(p==q) return 0;
if(len==2){
if(p==q) return 0;
else return 1;
}
if(dp[len][p][q]!=-1) return dp[len][p][q];
int res=0;
for(int i=0;i<=9;i++){
if(i==q || i==p) continue;
res+=f(len-1,q,i);
}
//cout << len << ' ' << p << ' ' << q << ' ' << res << '\n';
return dp[len][p][q]=res;
}
int solve(int n){
int sum=0;
if(n<=9) return n+1;
else sum=10;
if(n==1e18) n--;
string s=to_string(n);reverse(s.begin(),s.end());
int len=s.length();
for(int i=2;i<len;i++){
for(int p=1;p<=9;p++){
for(int q=0;q<=9;q++) sum+=f(i,p,q);
}
}
int pre1=-1,pre2=-1,lst=len;
for(int i=1;i<(s[len-1]-'0');i++){
for(int p=0;p<=9;p++) sum+=f(len,i,p);
}
pre1=s[len-1]-'0';
for(int i=len-1;i>=2;i--){
int x=s[i-1]-'0';
for(int p=0;p<x;p++){
for(int q=0;q<=9;q++){
if(p==pre2 || p==pre1 || q==pre1) continue;
sum+=f(i,p,q);
}
}
if(x==pre1 || x==pre2) break;
pre2=pre1;pre1=x;lst=i;
}
if(lst==2){
for(int i=0;i<=s[0]-'0';i++){
if(i==pre1 || i==pre2) continue;
sum++;
}
}
return sum;
}
signed main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);cout.tie(NULL);
int a,b;cin >> a >> b;power[0]=1;
for(int i=0;i<=18;i++){
for(int p=0;p<=9;p++){
for(int q=0;q<=9;q++) dp[i][p][q]=-1;
}
}
for(int i=1;i<=18;i++) power[i]=power[i-1]*10;
cout << solve(b)-solve(a-1) << '\n';
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
340 KB |
Output is correct |
| 3 |
Correct |
1 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
0 ms |
212 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
324 KB |
Output is correct |
| 8 |
Correct |
1 ms |
212 KB |
Output is correct |
| 9 |
Correct |
1 ms |
212 KB |
Output is correct |
| 10 |
Correct |
1 ms |
328 KB |
Output is correct |
| 11 |
Correct |
1 ms |
212 KB |
Output is correct |
| 12 |
Correct |
1 ms |
340 KB |
Output is correct |
| 13 |
Correct |
1 ms |
320 KB |
Output is correct |
| 14 |
Correct |
1 ms |
212 KB |
Output is correct |
| 15 |
Correct |
1 ms |
212 KB |
Output is correct |
| 16 |
Correct |
0 ms |
320 KB |
Output is correct |
| 17 |
Correct |
1 ms |
212 KB |
Output is correct |
| 18 |
Correct |
1 ms |
212 KB |
Output is correct |
| 19 |
Correct |
1 ms |
320 KB |
Output is correct |
| 20 |
Correct |
1 ms |
212 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
212 KB |
Output is correct |
| 2 |
Correct |
1 ms |
212 KB |
Output is correct |
| 3 |
Correct |
1 ms |
324 KB |
Output is correct |
| 4 |
Correct |
1 ms |
212 KB |
Output is correct |
| 5 |
Correct |
1 ms |
212 KB |
Output is correct |
| 6 |
Correct |
1 ms |
212 KB |
Output is correct |
| 7 |
Correct |
0 ms |
212 KB |
Output is correct |
| 8 |
Correct |
1 ms |
212 KB |
Output is correct |
| 9 |
Correct |
1 ms |
212 KB |
Output is correct |
| 10 |
Correct |
1 ms |
340 KB |
Output is correct |
| 11 |
Correct |
1 ms |
340 KB |
Output is correct |
| 12 |
Correct |
1 ms |
212 KB |
Output is correct |
| 13 |
Correct |
1 ms |
212 KB |
Output is correct |
| 14 |
Correct |
1 ms |
324 KB |
Output is correct |
| 15 |
Correct |
1 ms |
340 KB |
Output is correct |
| 16 |
Correct |
1 ms |
340 KB |
Output is correct |
| 17 |
Correct |
1 ms |
212 KB |
Output is correct |
| 18 |
Correct |
1 ms |
212 KB |
Output is correct |
| 19 |
Correct |
0 ms |
212 KB |
Output is correct |
| 20 |
Correct |
1 ms |
340 KB |
Output is correct |
| 21 |
Correct |
1 ms |
212 KB |
Output is correct |
| 22 |
Correct |
0 ms |
212 KB |
Output is correct |
| 23 |
Correct |
1 ms |
212 KB |
Output is correct |
| 24 |
Correct |
1 ms |
340 KB |
Output is correct |
| 25 |
Correct |
1 ms |
324 KB |
Output is correct |
| 26 |
Correct |
1 ms |
212 KB |
Output is correct |
| 27 |
Correct |
1 ms |
256 KB |
Output is correct |
| 28 |
Correct |
1 ms |
212 KB |
Output is correct |
| 29 |
Correct |
1 ms |
212 KB |
Output is correct |
| 30 |
Correct |
1 ms |
212 KB |
Output is correct |
| 31 |
Correct |
1 ms |
324 KB |
Output is correct |
| 32 |
Correct |
1 ms |
212 KB |
Output is correct |
| 33 |
Correct |
1 ms |
212 KB |
Output is correct |
| 34 |
Correct |
1 ms |
324 KB |
Output is correct |
| 35 |
Correct |
1 ms |
212 KB |
Output is correct |
| 36 |
Correct |
1 ms |
212 KB |
Output is correct |
| 37 |
Correct |
1 ms |
324 KB |
Output is correct |
| 38 |
Correct |
1 ms |
212 KB |
Output is correct |
| 39 |
Correct |
0 ms |
324 KB |
Output is correct |
| 40 |
Correct |
1 ms |
324 KB |
Output is correct |
| 41 |
Correct |
1 ms |
328 KB |
Output is correct |
| 42 |
Correct |
0 ms |
340 KB |
Output is correct |
| 43 |
Correct |
1 ms |
340 KB |
Output is correct |
| 44 |
Correct |
1 ms |
212 KB |
Output is correct |
| 45 |
Correct |
0 ms |
212 KB |
Output is correct |
