Submission #1135648

#	Time	Username	Problem	Language	Result	Execution time	Memory
1135648		Newtonabc	Gift Exchange (JOI24_ho_t4)	C++20	100 / 100	1602 ms	69792 KiB

Main

#include<bits/stdc++.h>
using namespace std;
const int N=5e5+10;
const int M=1<<21;
const int K=2e5+10;
int a[N],b[N],mnmode,base,l[N],r[N];
vector<int> in[N];
vector<pair<int,int>> ask[N];
bool ans[K];
int comp(int aa,int bb){
    if(mnmode) return min(aa,bb);
    else return max(aa,bb);
}
int n;
struct stree{
    int s[M],lz[M];
    void init(){for(int i=0;i<M;i++) s[i]=lz[i]=base;}
    void pushlz(int l,int r,int idx){
        if(lz[idx]==base) return;
        s[idx]=lz[idx];
        if(l!=r) lz[idx*2]=lz[idx],lz[idx*2+1]=lz[idx];
        lz[idx]=base;
    }
    void update(int l,int r,int idx,int a,int b,int val){
        pushlz(l,r,idx);
        if(b<l || a>r) return;
        if(a<=l && b>=r){
            lz[idx]=val;
            pushlz(l,r,idx);
            return;
        }
        int m=(l+r)/2;
        update(l,m,idx*2,a,b,val);
        update(m+1,r,idx*2+1,a,b,val);
        s[idx]=comp(s[idx*2],s[idx*2+1]);
    }
    int query(int l,int r,int idx,int a,int b){
        pushlz(l,r,idx);
        if(b<l || a>r) return (mnmode?n+1:0);
        if(a<=l && b>=r) return s[idx];
        int m=(l+r)/2;
        return comp(query(l,m,idx*2,a,b),query(m+1,r,idx*2+1,a,b));
    }
}t;
int main(){
    cin>>n;
    for(int i=1;i<=n;i++) cin>>a[i];
    for(int i=1;i<=n;i++) cin>>b[i];
    base=0;
    t.init();
    for(int i=1;i<=n;i++){
        l[i]=t.query(1,2*n,1,b[i],a[i]);
        in[l[i]].push_back(i);
        t.update(1,2*n,1,b[i],a[i],i);
    }
    base=n+1;
    mnmode=1;
    t.init();
    for(int i=n;i>=1;i--){
        r[i]=t.query(1,2*n,1,b[i],a[i]);
        t.update(1,2*n,1,b[i],a[i],i);
    }
    base=n+1,mnmode=0;
    t.init();
    /*for(int i=1;i<=n;i++) cout<<l[i] <<" ";
    cout<<"\n";
    for(int i=1;i<=n;i++) cout<<r[i] <<" ";
    cout<<"\n";*/
    for(int i=1;i<=n;i++) if(r[i]<=n) t.update(1,n,1,i,i,r[i]);
    //for(int i=1;i<=n;i++) cout<<t.query(1,n,1,i,i) <<" ";
    //cout<<"\n";
    int q;
    cin>>q;
    for(int i=0;i<q;i++){
        int ll,rr; cin>>ll >>rr;
        ask[ll].push_back({rr,i});
    }
    for(int i=n;i>=1;i--){
        for(int tmp:in[i]) t.update(1,n,1,tmp,tmp,0);
        /*for(int j=1;j<=n;j++) cout<<t.query(1,n,1,j,j) <<" ";
        cout<<"\n";*/
        for(pair<int,int> tmp:ask[i]){
            int k=t.query(1,n,1,i,tmp.first);
            if(tmp.first>=k) ans[tmp.second]=true;
        }
    }
    for(int i=0;i<q;i++){
        if(ans[i]) cout<<"Yes";
        else cout<<"No";
        cout<<"\n";
    }

}

• 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