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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define trace(x) clog << "=>" << #x << ":" << x << endl;
  4. #define trace2(x, y) clog << "=>" << #x << ":" << x << endl <<"=>"<<#y << ":" << y << endl;
  5. using ll = long long int;
  6. using pii = pair<int, int>;
  7. int mod = 1e9 + 7;
  8. ll exp(ll base, ll pw) { ll ans = 1; while (pw > 0) { if (pw & 1) { ans *= base; } base *= base; pw >>= 1; } return ans; }
  9. int add(ll a, ll b){ return (a%mod + b%mod)%mod; }
  10. int mul(ll a, ll b){ return (a%mod * b%mod)%mod; }
  11. int modexp(int base, int pw) { int ans = 1; while (pw > 0) { if (pw & 1) { ans = mul(ans,base); } base = mul(base, base); pw >>= 1; } return ans; }
  12.  
  13. void decrement(string &s)
  14. {
  15.     int l = s.length() - 1;
  16.     int g = s[l] - '0';
  17.     int b = 0;
  18.     if (g != 0) {
  19.         g--;
  20.         s[l] = g + '0';
  21.     }
  22.     else {
  23.         g = 9;
  24.         s[l] = g + '0';
  25.         l--;
  26.         b = 1;
  27.     }
  28.     while (b != 0 && l >= 0) {
  29.         int g = s[l] - '0';
  30.         if (g != 0) {
  31.             g--;
  32.             s[l] = g + '0';
  33.             b = 0;
  34.         }
  35.         else {
  36.             g = 9;
  37.             s[l] = g + '0';
  38.             b = 1;
  39.             l--;
  40.         }
  41.     }
  42.     if(s[0] == '0'){
  43.         s = s.substr(1);
  44.     }
  45. }
  46.  
  47. int dp[51][17][17][17][2];
  48.  
  49. int memo(string &r, int n, int three, int six, int nine, int tight){
  50.     if(three > 16 || six > 16 || nine > 16)return 0;
  51.     if(dp[n][three][six][nine][tight]!=-1)return dp[n][three][six][nine][tight];
  52.     if(n == 0){
  53.         return dp[n][three][six][nine][tight] = (three == six && six == nine && three > 0);
  54.     }
  55.     int cnt = 0, maxDigit = tight ? r[r.length()-n]-'0' : 9;
  56.     for(int i=0;i<=maxDigit;i++){
  57.         cnt = add(cnt, memo(r, n-1, (i == 3) + three, (i == 6) + six, (i == 9) + nine,
  58.                   tight & (i == maxDigit)));
  59.     }
  60.     return dp[n][three][six][nine][tight] = cnt;
  61. }
  62.  
  63. void solve(){
  64.     string a, b;
  65.     cin>>a>>b;
  66.     decrement(a);
  67.     memset(dp, -1, sizeof(dp));
  68.     int R = memo(b, b.length(), 0, 0, 0, 1);
  69.     memset(dp, -1, sizeof(dp));
  70.     int L = memo(a, a.length(), 0, 0, 0, 1);
  71.  
  72.     int ans = (R-L);
  73.     if(ans < 0)ans += mod;
  74.     cout<<ans<<endl;
  75. }
  76.  
  77. int main(){
  78. 	ios_base::sync_with_stdio(false);
  79. 	cin.tie(NULL);
  80. 	#ifndef ONLINE_JUDGE
  81. 		freopen("in.txt", "r", stdin);
  82. 		freopen("out.txt", "w", stdout);
  83. 	#endif
  84.     int t;
  85.     cin>>t;
  86.     while(t--){
  87.     	solve();
  88.     }
  89.     return 0;
  90. }
  91.  
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https://ideone.com/6VF3a9
problem NUMTSN, based on SPOJ submission 28183822 (CPP), 2021-07-12 08:58:12
language:
C++ (gcc 8.3)
created:
2 years ago
visibility:
public

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