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  1. #include <bits/stdc++.h>
  2. #define ll long long
  3. #define f first
  4. #define s second
  5. const ll mod = 1000000007;
  6. using namespace std;
  7. vector<int>v;
  8. int n,d;
  9. int a[300005],l[300005];
  10. void iswn(){
  11.     cin >> n;
  12.     for(int i = 1;i <= n;i++)cin >> a[i];
  13.     bool ok = 0;
  14.     set<int>st;st.insert(a[1]);
  15.     for(int i = 2;i <= n;i++){
  16.         auto cs = st.lower_bound(a[i]);
  17.         if(cs != st.end()){
  18.             l[i] = *cs;
  19.         }
  20.         else l[i] = -1;
  21.         st.insert(a[i]);
  22.     }
  23.     st.clear();st.insert(a[n]);
  24.     for(int i = n-1;i >= 2;i--){
  25.         auto cs = st.upper_bound(l[i]);
  26.         if(l[i] != -1 && cs != st.end()){
  27.             ok = 1;
  28.             break;
  29.         }
  30.         st.insert(a[i]);
  31.     }
  32.     if(ok)v.push_back(d);
  33. }
  34. int main(){
  35.     ios_base::sync_with_stdio(0);
  36.     cin.tie(0);cout.tie(0);
  37.     if(fopen("BAIB.INP","r")){
  38.         freopen("BAIB.INP","r",stdin);
  39.         freopen("BAIB.OUT","w",stdout);
  40.     }
  41.     int ts = 1;cin >> ts;
  42.     for(d = 1;d <= ts;d++)iswn();
  43.     cout << v.size() << '\n';
  44.     for(int i = 0;i < v.size();i++)cout << v[i] << '\n';
  45.     return 0;
  46. }
Success #stdin #stdout 0.01s 5292KB
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https://ideone.com/RbNQDv
language:
C++14 (gcc 8.3)
created:
4 days ago
visibility:
public

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