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  1. /*Recursive Segment tree for competitive programing*/
  2.  
  3. #include <iostream>
  4. #include <vector>
  5.  
  6. using namespace std;
  7.  
  8. struct Segment{
  9.    vector <long long> st;
  10.    vector <long long> dt;
  11.    int sz;
  12.    void build(int p , int l, int r){
  13.       if(l==r){
  14.          st[p] = l;
  15.       }
  16.       else{
  17.          int mid = (l+r)>>1;
  18.          int left = p<<1;
  19.          build(left, l, mid);
  20.          build(left+1, mid + 1 , r);
  21.          int p1 = st[left] , p2 = st[left+1];
  22.          st[p] = (dt[p1] <= dt[p2]) ? p1 : p2;
  23.       }
  24.    }
  25.  
  26.    Segment(const vector<long long> &data){
  27.       sz = data.size();
  28.       st.assign(3*sz,0);
  29.       dt = data;
  30.       build(1,0,sz-1);
  31.    }
  32.  
  33.    int query(int p, int l, int r, int &i, int &j){
  34.       if(i>r || j< l)
  35.          return -1;
  36.       else if(i<= l && j>=r){
  37.          return st[p];
  38.       }
  39.       else{
  40.          int left = p<<1;
  41.          int mid = (l+r)>>1;
  42.          int lf = query(left, l, mid, i, j);
  43.          int rg = query(left + 1, mid+1, r, i, j);
  44.          if(lf == -1) return rg;
  45.          if(rg == -1) return lf;
  46.          return dt[lf] < dt[rg] ? lf : rg;
  47.       }
  48.    }
  49.  
  50.    int update(int p, int l, int r, int id, int v){
  51.       if(l==r)
  52.          return st[p] = l;
  53.       else{
  54.          int rg = (l+r)/2 +1;
  55.          rg <= id ? update(p*2+1, rg, r,id, v) : update(p*2, l, (l+r)/2,id, v);
  56.          st[p] = dt[st[p*2]] < dt[st[p*2+1]] ? st[p*2] : st[p*2+1];
  57.       }
  58.    }
  59.  
  60.    void update(int p, int v){
  61.       dt[p] = v;
  62.       update(1,0,sz-1,p,v);
  63.    }
  64.  
  65.    long long query(int &i, int &j){
  66.       int ans = query(1, 0, sz-1, i, j);
  67.       return dt[ans];
  68.    }
  69. };
  70.  
  71. int main(){
  72.    //std::ios::sync_with_stdio(false);
  73.  
  74.    int t,nl =0;
  75.    scanf("%d",&t);
  76.    while(t--){
  77.       //cout<<"Scenario #"<<++nl<<":\n";
  78.       printf("Scenario #%d:\n",++nl);
  79.       vector<long long> data(100005);
  80.       int n,q,i,j;
  81.       scanf("%d",&n);
  82.  
  83.       for(int i=0; i<n; i++)
  84.          scanf("%lld",&data[i]);
  85.          //cin>>data[i];
  86.  
  87.  
  88.       Segment sg(data);
  89.  
  90.       //cin>>q;
  91.       scanf("%d",&q);
  92.  
  93.       while(q--){
  94.          //cin>>i>>j;
  95.          scanf("%d%d",&i,&j);
  96.          //cout<<sg.query(i,j)<<"\n";
  97.          printf("%lld\n",sg.query(i,j));
  98.       }
  99.    }
  100. }
  101.  
Runtime error #stdin #stdout 0s 19576KB
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https://ideone.com/PRIfI5
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
public

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