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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4. #define endl '\n'
  5. ll N = 1e9+7;
  6. ll oo =1e13;
  7. const ll maxx = 1000000 + 3;
  8. ll n,k,q,x,y,z,l,r,mid,ans;
  9.  
  10.  
  11. void go(ll num , set<ll>v) {
  12.     if (num > n)return;
  13.         ans++;
  14.     for (ll j =0;j<10;j++) {
  15.         set<ll>nv=v;
  16.         nv.insert(j);
  17.         if (nv.size()>2) {
  18.             continue;
  19.         }
  20.         go(num*10+j,nv);
  21.  
  22.     }
  23. }
  24. void solve() {
  25.     cin>>n;
  26.     for (ll i =1 ;i <10;i++) {
  27.         set<ll>v;
  28.  
  29.         v.insert(i);
  30.         go(i,v);
  31.  
  32.     }
  33.     cout<<ans<<endl;
  34. }
  35. int main() {
  36.     ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
  37.     ll t=1 ;
  38.     // cin >>t;
  39.     while (t--) {
  40.         ans=0;
  41.         solve();
  42.     }
  43. }
Success #stdin #stdout 0s 5320KB
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https://ideone.com/fHmdQ4
language:
C++ (gcc 8.3)
created:
5 hours ago
visibility:
public

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