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  1. #include<bits/stdc++.h>
  2.  
  3. #define ll long long
  4. #define pp push_back
  5. #define endl '\n'
  6. #define all(x) x.begin(),x.end()
  7. #define ld long double
  8. #define PI acos(-1)
  9. #define ones(x) __builtin_popcountll(x)
  10. //#define int ll
  11.  
  12. using namespace std;
  13.  
  14. void Drakon() {
  15.     ios_base::sync_with_stdio(false);
  16.     cin.tie(nullptr);
  17.     cout.tie(nullptr);
  18. #ifdef Clion
  19.     freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
  20. #endif
  21. }
  22.  
  23. unsigned long long inf = 1e10;
  24. const double EPS = 1e-6;
  25. const int MOD = 1000000007, N = 200005, LOG = 25;
  26.  
  27. ll mul(const ll &a, const ll &b) {
  28.     return (a % MOD + MOD) * (b % MOD + MOD) % MOD;
  29. }
  30.  
  31. ll add(const ll &a, const ll &b) {
  32.     return (a + b + 2 * MOD) % MOD;
  33. }
  34.  
  35. ll pw(ll x, ll y) {
  36.     ll ret = 1;
  37.     while (y > 0) {
  38.         if (y % 2 == 0) {
  39.             x = mul(x, x);
  40.             y = y / 2;
  41.         } else {
  42.             ret = mul(ret, x);
  43.             y = y - 1;
  44.         }
  45.     }
  46.     return ret;
  47. }
  48.  
  49. string s;
  50. ll dp[25][2][15];
  51.  
  52. ll slv(int i, bool less, int prevDigit) {
  53.     if(i == s.size()) return 1;
  54.     ll &ret = dp[i][less][prevDigit];
  55.     if(~ret)
  56.         return ret;
  57.     int mn = 0, mx = 9;
  58.     if(!less) mx = s[i] - '0';
  59.     ret = 0;
  60.     for (int j = mn; j <= mx; ++j) {
  61.         if(prevDigit == 10) {
  62.             ret += slv(i + 1, less | (j < (s[i] - '0')), (j == 0 ? 10 : j));
  63.         }
  64.         else {
  65.             if(abs(j - prevDigit) <= 2)
  66.                 ret += slv(i + 1, less | (j < (s[i] - '0')), j);
  67.         }
  68.     }
  69.     return ret;
  70. }
  71.  
  72. void solve() {
  73.     ll l, r;
  74.     cin >> l >> r;
  75.  
  76.     memset(dp, -1, sizeof dp);
  77.     s = to_string(r);
  78.     ll ans = slv(0, false, 10);
  79.  
  80.     memset(dp, -1, sizeof dp);
  81.     s = to_string(l - 1);
  82.     ans -= slv(0, false, 10);
  83.  
  84.     cout << ans;
  85. }
  86.  
  87. signed main() {
  88.     Drakon();
  89.     int t = 1;
  90.     //cin >> t;
  91.     while (t--) {
  92.         solve();
  93.     }
  94. }
Success #stdin #stdout 0s 5324KB
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https://ideone.com/xeAeuI
language:
C++14 (gcc 8.3)
created:
11 days ago
visibility:
public

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