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  1. #include<bits/stdc++.h>
  2. #include<vector>
  3. #define ll long long
  4. #define ii int
  5. using namespace std;
  6. const ll lim = 1e6+5;
  7. ii n, m,f[lim];
  8. int main()
  9. {
  10.     cin>>n>>m;
  11.     vector<ii> a(n+1);
  12.     for(ii i = 1; i <= n;i++){
  13.         cin>>a[i];
  14.     }
  15.     ll t=0,d=1;
  16.     for(ii i=1;i<=n;i++)
  17.     {
  18.         if(t==0)
  19.         {
  20.             if(a[i]>=a[i-1]) f[i]=d;
  21.             else
  22.             {
  23.                 t=1;
  24.                 f[i]=d;
  25.             }
  26.         }
  27.         else
  28.         {
  29.             if(a[i]>a[i-1])
  30.             {
  31.                 t=0;
  32.                 d++;
  33.                 f[i]=d;
  34.             }
  35.             else f[i]=d;
  36.         }
  37.     }
  38.     while(m--)
  39.     {
  40.         ii x,y;
  41.         cin>>x>>y;
  42.         if(f[x]==f[y]) cout<<"Yes\n";
  43.         else cout<<"No\n";
  44.     }
  45. }
Success #stdin #stdout 0s 5280KB
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https://ideone.com/Pz0HkT
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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