Submission #1231462

#	Time	Username	Problem	Language	Result	Execution time	Memory
1231462		TadijaSebez	Gift Exchange (JOI24_ho_t4)	C++20	100 / 100	1526 ms	96408 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define pb push_back

const int N=500050;
int a[N],b[N],L[N],R[N],aid[N],bid[N];

namespace Seg1{
const int M=4*N;
int root,tsz,ls[M],rs[M];
int lzy[M],mx[M];

void Build(int&c,int ss,int se){
    c=++tsz;
    if(ss==se)return;
    int mid=ss+se>>1;
    Build(ls[c],ss,mid);
    Build(rs[c],mid+1,se);
}

void upd(int c,int x){
    mx[c]=max(mx[c],x);
    lzy[c]=max(lzy[c],x);
}

void push(int c){
    if(lzy[c]){
        upd(ls[c],lzy[c]);
        upd(rs[c],lzy[c]);
        lzy[c]=0;
    }
}

void Add(int c,int ss,int se,int qs,int qe,int x){
    if(qs>qe||qs>se||ss>qe)return;
    if(qs<=ss&&qe>=se){
        upd(c,x);
        return;
    }
    push(c);
    int mid=ss+se>>1;
    Add(ls[c],ss,mid,qs,qe,x);
    Add(rs[c],mid+1,se,qs,qe,x);
    mx[c]=max(mx[ls[c]],mx[rs[c]]);
}

int Get(int c,int ss,int se,int qs,int qe){
    if(qs>qe||qs>se||ss>qe)return 0;
    if(qs<=ss&&qe>=se){
        return mx[c];
    }
    push(c);
    int mid=ss+se>>1;
    return max(Get(ls[c],ss,mid,qs,qe),Get(rs[c],mid+1,se,qs,qe));
}

void Clear(){
    for(int i=1;i<=tsz;i++){
        ls[i]=rs[i]=0;
        mx[i]=0;
        lzy[i]=0;
    }
    root=tsz=0;
}
}

vector<pair<int,int>> Qs[N];
vector<int> Us[N];

const int inf=1e9+7;

namespace Seg2{
const int M=2*N;
int root,tsz,ls[M],rs[M],mn[M];

void Build(int&c,int ss,int se){
    c=++tsz;
    if(ss==se){
        mn[c]=L[ss];
        return;
    }
    int mid=ss+se>>1;
    Build(ls[c],ss,mid);
    Build(rs[c],mid+1,se);
    mn[c]=min(mn[ls[c]],mn[rs[c]]);
}
void Set(int c,int ss,int se,int qi,int f){
    if(ss==se){
        mn[c]=f;
        return;
    }
    int mid=ss+se>>1;
    if(qi<=mid)Set(ls[c],ss,mid,qi,f);
    else Set(rs[c],mid+1,se,qi,f);
    mn[c]=min(mn[ls[c]],mn[rs[c]]);
}
int Get(int c,int ss,int se,int qs,int qe){
    if(qs>qe||qs>se||ss>qe)return inf;
    if(qs<=ss&&qe>=se)return mn[c];
    int mid=ss+se>>1;
    return min(Get(ls[c],ss,mid,qs,qe),Get(rs[c],mid+1,se,qs,qe));
}
}

bool ans[N];
int main(){
    int n;
    scanf("%i",&n);
    for(int i=1;i<=n;i++){
        scanf("%i",&a[i]);
    }
    for(int i=1;i<=n;i++){
        scanf("%i",&b[i]);
    }
    Seg1::Build(Seg1::root,1,2*n);
    for(int i=1;i<=n;i++){
        L[i]=Seg1::Get(Seg1::root,1,2*n,b[i],a[i]);
        Seg1::Add(Seg1::root,1,2*n,b[i],a[i],i);
    }
    Seg1::Clear();
    Seg1::Build(Seg1::root,1,2*n);
    for(int i=n;i>=1;i--){
        R[i]=n+1-Seg1::Get(Seg1::root,1,2*n,b[i],a[i]);
        Seg1::Add(Seg1::root,1,2*n,b[i],a[i],n+1-i);
        Us[R[i]].pb(i);
    }
    Seg2::Build(Seg2::root,1,n);
    int q;
    scanf("%i",&q);
    for(int i=1;i<=q;i++){
        int l,r;
        scanf("%i %i",&l,&r);
        Qs[r].pb({l,i});
    }
    for(int i=1;i<=n;i++){
        for(int j:Us[i]){
            Seg2::Set(Seg2::root,1,n,j,inf);
        }
        for(auto qu:Qs[i]){
            ans[qu.second]=Seg2::Get(Seg2::root,1,n,qu.first,i)>=qu.first;
        }
    }
    for(int i=1;i<=q;i++)printf(ans[i]?"Yes\n":"No\n");
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:108:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  108 |     scanf("%i",&n);
      |     ~~~~~^~~~~~~~~
Main.cpp:110:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  110 |         scanf("%i",&a[i]);
      |         ~~~~~^~~~~~~~~~~~
Main.cpp:113:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  113 |         scanf("%i",&b[i]);
      |         ~~~~~^~~~~~~~~~~~
Main.cpp:129:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  129 |     scanf("%i",&q);
      |     ~~~~~^~~~~~~~~
Main.cpp:132:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  132 |         scanf("%i %i",&l,&r);
      |         ~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 5 / 5
• Subtask 3: 10 / 10
• Subtask 4: 31 / 31
• Subtask 5: 8 / 8
• Subtask 6: 12 / 12
• Subtask 7: 18 / 18
• Subtask 8: 12 / 12