Submission #306094

#	Time	Username	Problem	Language	Result	Execution time	Memory
306094		vipghn2003	Exhibition (JOI19_ho_t2)	C++14	0 / 100	5 ms	6656 KiB

joi2019_ho_t2

#include<bits/stdc++.h>
#define fi first
#define se second
#define pii pair<int,int>
#define mp make_pair
using namespace std;

const int N=1e5+5;
int n,m,c[N];
pii a[N],f[N],ST[8*N];

void update(int id,int l,int r,int pos,pii val)
{
    if(pos<l||pos>r) return ;
    if(l==r)
    {
        ST[id]=max(ST[id],val);
        return ;
    }
    int mid=(l+r)/2;
    update(id*2,l,mid,pos,val);
    update(id*2+1,mid+1,r,pos,val);
    ST[id]=max(ST[id*2],ST[id*2+1]);
}

pii get (int id,int l,int r,int L,int R)
{
    if (r<L||R<l) return mp(-1e9,0);
    if (L<=l&&r<=R) return ST[id];
    int mid=(l+r)/2;
    return max (get(id*2,l,mid,L,R),get(id*2+1,mid+1,r,L,R));
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin>>n>>m;
    vector<int>val;
    for(int i=1;i<=n;i++)
    {
        cin>>a[i].fi>>a[i].se;
        val.push_back(a[i].se);
    }
    for(int i=1;i<=m;i++) cin>>c[i];
    sort(val.begin(),val.end());
    val.erase(unique(val.begin(),val.end()),val.end());
    int sz=val.size();
    for(int i=1;i<=n;i++) a[i].se=lower_bound(val.begin(),val.end(),a[i].se)-val.begin()+1;
    sort(a+1,a+n+1);
    sort(c+1,c+m+1);
    for(int i=1;i<8*N;i++) ST[i]=mp(-1e9,0);
    pii res=mp(0,0);
    for(int i=1;i<=n;i++)
    {
        if(a[i].fi>c[m]) continue;
        int id=lower_bound(c+1,c+m+1,a[i].fi)-c;
        f[i]=mp(1,-id);
        pii cur=get(1,1,sz,1,a[i].se);
        int pos=max(-cur.se+1,id);
        if(pos<=m) f[i]=max(f[i],mp(cur.fi+1,-pos));
        update(1,1,sz,a[i].se,f[i]);
        res=max(res,f[i]);
        //cout<<f[i].fi<<' '<<f[i].se<<'\n';
    }
    cout<<res.fi;
}
/*
3 4
10 20
5 1
3 5
4 6 10 4
*/

• Subtask 1: 0 / 10
• Subtask 2: 0 / 40
• Subtask 3: 0 / 50