Submission #827703

#	Time	Username	Problem	Language	Result	Execution time	Memory
827703		LeVanThuc	Advertisement 2 (JOI23_ho_t2)	C++17	100 / 100	552 ms	60932 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define fi first
#define se second
#define p(x,y) pair<ll,ll>(x,y)
#define BIT(i,x) ((x>>i)&1)
#define MASK(x) (1<<x)
#define ld long double
#define __builtin_popcount __builtin_popcountll
#define pll pair<ll,ll>
template<class T1,class T2>
bool maximize(T1 &x,const T2 &y)
{
    if(x<y)
    {
        x=y;
        return 1;
    }
    return 0;
}
template<class T1,class T2>
bool minimize(T1 &x,const T2 &y)
{
    if(x>y)
    {
        x=y;
        return 1;
    }
    return 0;
}
void online()
{
    std::ios_base::sync_with_stdio(0);
    cin.tie(0);
}
struct Fenwick
{
    vector<ll> Tree;
    ll n;
    Fenwick(ll _n=0)
    {
        n=_n;
        Tree.resize(n+2);
    }
    void update(ll x,ll vl)
    {
        for(;x<=n;x+=x&-x) maximize(Tree[x],vl);
    }
    ll get(ll vl)
    {
        ll cr=0,x=(1<<(31-__builtin_clz(n)));
        while(x)
        {
            if(x+cr<=n&&Tree[x+cr]<=vl)
            {
                cr+=x;
            }
            x/=2;
        }
        return cr;
    }
};
struct SegmentTree
{
    struct Node
    {
        ll vl,lazy;
        Node(ll _vl=1e9,ll _lazy=1e9)
        {
            vl=_vl;
            lazy=_lazy;
        }
    };
    vector<Node> Tree;
    ll n;
    SegmentTree(ll _n=0)
    {
        n=_n;
        Tree.resize(4*n);
    }
    void down(ll i)
    {
        ll x=Tree[i].lazy;
        Tree[i].lazy=1e9;
        minimize(Tree[i*2].vl,x);
        minimize(Tree[i*2+1].vl,x);
        minimize(Tree[i*2].lazy,x);
        minimize(Tree[i*2+1].lazy,x);
    }
    void update(ll i,ll l,ll r,ll l1,ll r1,ll vl)
    {
        if(r1<l||r<l1) return;
        if(l1<=l&&r<=r1)
        {
            minimize(Tree[i].vl,vl);
            minimize(Tree[i].lazy,vl);
            return;
        }
        down(i);
        update(i*2,l,(l+r)/2,l1,r1,vl);
        update(i*2+1,(l+r)/2+1,r,l1,r1,vl);
        Tree[i].vl=min(Tree[i*2].vl,Tree[i*2+1].vl);
    }
    ll query(ll i,ll l,ll r,ll l1,ll r1)
    {
        if(l1==0) return 0;
        if(r1<l||r<l1) return 1e9;
        if(l1<=l&&r<=r1) return Tree[i].vl;
        down(i);
        return min(query(i*2,l,(l+r)/2,l1,r1),query(i*2+1,(l+r)/2+1,r,l1,r1));
    }
};
const ll N=5e5+10;
pll a[N];
ll n,b[N];
int main()
{
    online();
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        cin>>a[i].fi>>a[i].se;
    }
    ll on=n;
    sort(a+1,a+n+1);
    for(int i=1;i<=on;i++)
    {
        if(a[i].fi==a[i-1].fi)
        {
            a[i-1].fi=1e9;
            n--;
        }
    }
    sort(a+1,a+on+1);
    Fenwick F1(n);
    for(int i=n;i>=1;i--)
    {
        F1.update(i,a[i].fi+a[i].se);
        b[i]=F1.get(a[i].fi+a[i].se);
    }
    Fenwick F2(n);
    SegmentTree S(n);
    for(int i=1;i<=n;i++)
    {
        F2.update(n-i+1,a[i].se+1e9-a[i].fi);
        ll z=n-F2.get(a[i].se+1e9-a[i].fi)+1;
        ll vl=S.query(1,1,n,z-1,i-1);
        S.update(1,1,n,i,i,vl+1);
        vl=S.query(1,1,n,i,i);
        S.update(1,1,n,i,b[i],vl);
    }
    cout<<S.query(1,1,n,n,n);
}

• Subtask 1: 10 / 10
• Subtask 2: 23 / 23
• Subtask 3: 36 / 36
• Subtask 4: 31 / 31