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  1. #include <bits/stdc++.h>
  2. #define ll long long
  3. #define fi first
  4. #define se second
  5. #define fo(i,d,c) for(int i=d;i<=c;i++)
  6. #define IOS ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
  7.  
  8. using namespace std;
  9.  
  10. int n,t;
  11. const int N=1e6;
  12. int cs[10]={0,1,3,7,9};
  13. int a[N+1],f[N+1];
  14.  
  15. bool ktra(int n){
  16.     if(n<2) return false;
  17.     fo(i,2,sqrt(n)){
  18.         if(n%i==0) return false;
  19.     }
  20.     return true;
  21. }
  22. bool check(int n)
  23. {
  24.     if(ktra(n)){
  25.         bool ac=true;
  26.         fo(i,1,4){
  27.             int tmp=n*10+cs[i];
  28.             if(ktra(tmp)){
  29.                 ac=false;
  30.             }
  31.         }
  32.         if(ac){
  33.             return false;
  34.         }
  35.         else{
  36.             while(n>10){
  37.                 n/=10;
  38.                 if(!ktra(n)){
  39.                     return false;
  40.                 }
  41.             }
  42.             return true;
  43.         }
  44.     }
  45.     else{
  46.         return false;
  47.     }
  48. }
  49. int main()
  50. {
  51.     IOS;
  52.     cin>>n;
  53.     fo(i,1,n) cin>>a[i];
  54.     cin>>t;
  55.     f[0]=0;
  56.     fo(i,1,n){
  57.         f[i]=f[i-1];
  58.         if(check(a[i])){
  59.             f[i]+=1;
  60.         }
  61.     }
  62.     int u,v;
  63.     while(t-->0){
  64.         cin>>u>>v;
  65.         cout<<f[v]-f[u-1]<<'\n';
  66.     }
  67.     return 0;
  68. }
  69.  
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/MTGV1l
language:
C++ (gcc 8.3)
created:
30 days ago
visibility:
public

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