#include <bits/stdc++.h>
using namespace std;
#define loop(i, a, b) for (int i = (a); i < (b); i++)
typedef long long ll;
const int MAX_DIGITS = 20;
ll cnt[MAX_DIGITS][10];
ll cnt_digits[MAX_DIGITS];
ll a, b;
ll dp[11][11][MAX_DIGITS][2];
vector<int> num;
int curr_num[MAX_DIGITS];
ll backtrack(int prev1, int prev2, int pos, int state){
if (pos >= num.size())
return 1;
if(dp[prev1][prev2][pos][state] != -1)
return dp[prev1][prev2][pos][state];
int limit = 0;
if(state == 0){
limit = num[pos];
} else
{
limit = 9;
}
ll res = 0;
for(int i = 0; i <= limit; i++){
int nstate = state;
if (i < limit) nstate = 1;
if (i != prev1 && i != prev2)
res += backtrack(i, prev1, pos + 1, nstate);
}
dp[prev1][prev2][pos][state] = res;
return dp[prev1][prev2][pos][state];
}
ll solve(int x){
if (x < 0)
return 0;
num.clear();
while(x > 0){
num.push_back(x % 10);
x = x / 10;
}
reverse(num.begin(), num.end());
ll res = 1;
if (num.size() == 0)
return res;
memset(dp, -1, sizeof(dp));
for(int d = 1; d <= num[0]; d++){
res += backtrack(d, d, 1, d != num[0]);
}
for(int k = 2; k <= num.size(); k++){
for(int d = 1; d <= 9; d++){
res += backtrack(d, d, k, 1);
}
}
return res;
}
int main(){
cin >> a >> b;
cout << solve(b) - solve(a - 1) << "\n";
}
Compilation message
numbers.cpp: In function 'll backtrack(int, int, int, int)':
numbers.cpp:16:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if (pos >= num.size())
~~~~^~~~~~~~~~~~~
numbers.cpp: In function 'll solve(int)':
numbers.cpp:53:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int k = 2; k <= num.size(); k++){
~~^~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
384 KB |
Output is correct |
| 2 |
Correct |
0 ms |
384 KB |
Output is correct |
| 3 |
Incorrect |
0 ms |
384 KB |
Output isn't correct |
| 4 |
Correct |
0 ms |
384 KB |
Output is correct |
| 5 |
Correct |
0 ms |
384 KB |
Output is correct |
| 6 |
Correct |
0 ms |
384 KB |
Output is correct |
| 7 |
Correct |
0 ms |
384 KB |
Output is correct |
| 8 |
Correct |
0 ms |
384 KB |
Output is correct |
| 9 |
Correct |
0 ms |
384 KB |
Output is correct |
| 10 |
Correct |
1 ms |
512 KB |
Output is correct |
| 11 |
Correct |
0 ms |
384 KB |
Output is correct |
| 12 |
Correct |
1 ms |
384 KB |
Output is correct |
| 13 |
Correct |
0 ms |
384 KB |
Output is correct |
| 14 |
Correct |
0 ms |
384 KB |
Output is correct |
| 15 |
Correct |
0 ms |
384 KB |
Output is correct |
| 16 |
Correct |
0 ms |
384 KB |
Output is correct |
| 17 |
Correct |
0 ms |
384 KB |
Output is correct |
| 18 |
Correct |
0 ms |
256 KB |
Output is correct |
| 19 |
Incorrect |
0 ms |
384 KB |
Output isn't correct |
| 20 |
Correct |
0 ms |
384 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
384 KB |
Output is correct |
| 2 |
Incorrect |
0 ms |
256 KB |
Output isn't correct |
| 3 |
Incorrect |
0 ms |
384 KB |
Output isn't correct |
| 4 |
Incorrect |
0 ms |
384 KB |
Output isn't correct |
| 5 |
Correct |
0 ms |
384 KB |
Output is correct |
| 6 |
Correct |
0 ms |
384 KB |
Output is correct |
| 7 |
Correct |
0 ms |
384 KB |
Output is correct |
| 8 |
Correct |
0 ms |
384 KB |
Output is correct |
| 9 |
Correct |
0 ms |
384 KB |
Output is correct |
| 10 |
Correct |
0 ms |
384 KB |
Output is correct |
| 11 |
Correct |
0 ms |
384 KB |
Output is correct |
| 12 |
Correct |
0 ms |
384 KB |
Output is correct |
| 13 |
Correct |
0 ms |
384 KB |
Output is correct |
| 14 |
Correct |
0 ms |
384 KB |
Output is correct |
| 15 |
Correct |
0 ms |
384 KB |
Output is correct |
| 16 |
Incorrect |
0 ms |
384 KB |
Output isn't correct |
| 17 |
Incorrect |
0 ms |
384 KB |
Output isn't correct |
| 18 |
Correct |
0 ms |
256 KB |
Output is correct |
| 19 |
Incorrect |
0 ms |
384 KB |
Output isn't correct |
| 20 |
Correct |
0 ms |
256 KB |
Output is correct |
| 21 |
Incorrect |
1 ms |
384 KB |
Output isn't correct |
| 22 |
Incorrect |
1 ms |
384 KB |
Output isn't correct |
| 23 |
Incorrect |
0 ms |
256 KB |
Output isn't correct |
| 24 |
Correct |
1 ms |
256 KB |
Output is correct |
| 25 |
Incorrect |
1 ms |
384 KB |
Output isn't correct |
| 26 |
Incorrect |
0 ms |
384 KB |
Output isn't correct |
| 27 |
Incorrect |
0 ms |
256 KB |
Output isn't correct |
| 28 |
Incorrect |
0 ms |
384 KB |
Output isn't correct |
| 29 |
Correct |
0 ms |
256 KB |
Output is correct |
| 30 |
Incorrect |
0 ms |
384 KB |
Output isn't correct |
| 31 |
Incorrect |
0 ms |
384 KB |
Output isn't correct |
| 32 |
Incorrect |
0 ms |
384 KB |
Output isn't correct |
| 33 |
Incorrect |
0 ms |
384 KB |
Output isn't correct |
| 34 |
Incorrect |
0 ms |
384 KB |
Output isn't correct |
| 35 |
Incorrect |
0 ms |
384 KB |
Output isn't correct |
| 36 |
Incorrect |
0 ms |
384 KB |
Output isn't correct |
| 37 |
Incorrect |
1 ms |
384 KB |
Output isn't correct |
| 38 |
Incorrect |
1 ms |
384 KB |
Output isn't correct |
| 39 |
Incorrect |
1 ms |
384 KB |
Output isn't correct |
| 40 |
Incorrect |
0 ms |
384 KB |
Output isn't correct |
| 41 |
Incorrect |
0 ms |
384 KB |
Output isn't correct |
| 42 |
Correct |
0 ms |
256 KB |
Output is correct |
| 43 |
Incorrect |
0 ms |
384 KB |
Output isn't correct |
| 44 |
Incorrect |
0 ms |
384 KB |
Output isn't correct |
| 45 |
Incorrect |
1 ms |
384 KB |
Output isn't correct |
