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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define endl '\n'
  4. #define vi vector<int>
  5. #define fi first
  6. #define se second
  7. #define pb push_back
  8. #define FOR(a) for(auto &x : a)
  9. #define all(a) a.begin(), a.end()
  10. #define pii pair<int, int>
  11. #define rep(i, l, r) for(int i = l; i <= r; i++)
  12.  
  13. // author: ngotranthethinh
  14.  
  15. int n, q;
  16. const int MAXN = 1e6 + 5;
  17. int a[MAXN];
  18.  
  19. const int MAXPRIME = 1e7 + 5;
  20. bool nt[MAXPRIME];
  21.  
  22. void Sieve_Of_Prime(){
  23.     fill(nt, nt + MAXPRIME, true);
  24.     nt[0] = nt[1] = 0;
  25.  
  26.     for(int i = 2; i * i < MAXPRIME; i++){
  27.         if(nt[i]){
  28.             for(int j = i * i; j < MAXPRIME; j += i)
  29.                 nt[j] = false;
  30.         }
  31.     }
  32. }
  33.  
  34. int b[25];
  35.  
  36. int32_t main() {
  37.     ios::sync_with_stdio(false);
  38.     cin.tie(0); cout.tie(0);
  39.  
  40.     cin >> n >> q;
  41.  
  42.     int mx = 0;
  43.     rep(i, 1, n){
  44.         cin >> a[i];
  45.         mx = max(mx, a[i]);
  46.     }
  47.  
  48.     Sieve_Of_Prime();
  49.  
  50.     while(q--){
  51.         int l, r; cin >> l >> r;
  52.  
  53.         int len = r - l + 1;
  54.  
  55.         if(len > 24){
  56.             cout << "NO" << endl;
  57.             continue;
  58.         }
  59.  
  60.         int cnt = 0;
  61.         rep(i, l, r){
  62.             b[cnt++] = a[i];
  63.         }
  64.  
  65.         sort(b, b + cnt);
  66.  
  67.         bool ok = true;
  68.  
  69.         rep(i, 1, cnt - 1){
  70.             if(b[i] == b[i - 1] || b[i] % b[i - 1] != 0){
  71.                 ok = false;
  72.                 break;
  73.             }
  74.         }
  75.  
  76.         if(!ok){
  77.             cout << "NO" << endl;
  78.             continue;
  79.         }
  80.  
  81.         bool hasPrime = false;
  82.         rep(i, 0, cnt - 1){
  83.             if(nt[b[i]]){
  84.                 hasPrime = true;
  85.                 break;
  86.             }
  87.         }
  88.  
  89.         cout << (hasPrime ? "YES" : "NO") << endl;
  90.     }
  91.  
  92.     return 0;
  93. }
  94.  
Success #stdin #stdout 0.06s 14484KB
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https://ideone.com/hiJPB6
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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