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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. //n=1e6->~0.9->1.5s (affected by I/O)
  5.  
  6. //1-indexed
  7. struct ITsort{
  8.   typedef int T;
  9.   typedef pair<T,int> Node;
  10.   const Node INF={1e9,0};//be careful with T!
  11.   //{val,idx}
  12.   //edit this function for sort descending/ascending
  13.   Node Merge(const Node& a, const Node& b){
  14.     Node ans=a;
  15.     if(b.first<a.first)
  16.       ans=b; 
  17.     else if(b.first==a.first)
  18.       ans.second=min(ans.second,b.second);
  19.     return ans;
  20.   }
  21.   vector<T> a;
  22.   vector<Node> st;
  23.   int n;
  24.  
  25.   Node get(int u, int v){//[u, v)
  26.     Node ra=INF,rb=INF;
  27.     for(u+=n,v+=n;u<v;u>>=1,v>>=1){
  28.       if(u&1) ra=Merge(ra,st[u++]);
  29.       if(v&1) rb=Merge(rb,st[--v]);
  30.     }
  31.     return Merge(ra,rb);
  32.   }
  33.  
  34.   void upd(int i,T v){
  35.     for(st[i+=n]=Node(v,i);i>>=1;){
  36.       st[i]=Merge(st[i<<1],st[i<<1|1]);
  37.     }
  38.   }
  39.  
  40.   ITsort(int _n,const vector<T> &x){
  41.     n=_n;
  42.     a=x;
  43.     st.assign(2*n+5,INF);
  44.     // cout<<st[0].first<<" "<<st[0].second<<endl;
  45.     // cout<<n<<endl;
  46.     // for(int i:x)cout<<i<<",";
  47.     for(int i=1;i<=n;i++){
  48.       // cout<<i<<" ";
  49.       upd(i,a[i]);
  50.     }
  51.   }
  52.  
  53.   void Sort(int l,int r){
  54.     for(int i=l;i<=r;i++){
  55.       Node cur=get(i,r+1);
  56.       // cout<<cur.first<<" "<<cur.second<<endl;
  57.       swap(a[i],a[cur.second]);
  58.       upd(i,a[i]);
  59.       upd(cur.second,a[cur.second]);
  60.     }
  61.   }
  62.  
  63.   void Sort(){
  64.     Sort(1,n);
  65.   }
  66. };
  67.  
  68. int main(){
  69.   ios_base::sync_with_stdio(false);
  70.   cin.tie(NULL);cout.tie(NULL);
  71.   // cout<<INF.first<<" "<<INF.second<<endl;
  72.   vector<int>a;
  73.   int n;
  74.   cin>>n;n<<=1;a.resize(n+1);
  75.   for(int i=1;i<=n;i++)cin>>a[i];
  76.   // for(int i=1;i<=n;i++)cout<<a[i]<<" ";
  77.   ITsort it(n,a);
  78.   it.Sort(1,n/2);
  79.   for(int i=1;i<=n/2;i++)cout<<it.a[i]<<" ";
  80.   it.Sort(n/2+1,n);
  81.   for(int i=n;i>=n/2+1;i--)cout<<it.a[i]<<" ";
  82. }
Success #stdin #stdout 0.01s 5532KB
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