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  1. #include<bits/stdc++.h>
  2. #include<iostream>
  3. #include<vector>
  4. #include<algorithm>
  5. #include<string.h>
  6. using namespace std;
  7. typedef long long ll;
  8. typedef pair<int,int> pi;
  9. typedef vector<int> vi;
  10. ll a,b;
  11. int n,p;
  12. string s;
  13. string d(ll a,ll b){
  14.     string s="";
  15.     ll rem = a;
  16.     while(s.length() < n){
  17.         rem *= 10;
  18.         while(s.length() < n && rem < b){
  19.             rem *= 10;
  20.             s += '0';
  21.         }
  22.         if(s.length() == n)return s;
  23.         ll t = rem/b;
  24.         rem %= b;
  25.         s += char(t + '0');
  26.     }
  27.     return s;
  28. }
  29. ll dp[2][222];
  30. ll f(){
  31.     memset(dp,0,sizeof dp);
  32.     int idx = 1;
  33.  
  34.     for(int i=n-1;i>=0;i--){
  35.         idx = (idx+1)%2;
  36.         int t = (s[i] - '0')%p;
  37.         dp[idx][201] = (t == 0) + dp[(idx + 1)%2][t] + dp[(idx + 1)%2][201];
  38.         for(int j=0;j<p;j++){
  39.             int rem = (j * 10 + (s[i] - '0'))%p;
  40.             dp[idx][j] = (rem == 0) + dp[(idx+1)%2][rem];
  41.         }
  42.     }
  43.     return dp[idx][201];
  44.  
  45. }
  46. int main(){
  47.     //freopen("in.txt","r",stdin);
  48.     //freopen("out.txt","w",stdout);
  49.     int t;
  50.     cin>>t;
  51.     while(t--){
  52.         cin>>a>>b>>n>>p;
  53.         s = d(a,b);
  54.         //memset(dp,0,sizeof dp);
  55.         cout<<f()<<endl;
  56.     }
  57.  
  58. }
Runtime error #stdin #stdout 0.14s 3472KB
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https://ideone.com/U0SFDD
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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