Submission #895559

#	Time	Username	Problem	Language	Result	Execution time	Memory
895559		winter0101	Advertisement 2 (JOI23_ho_t2)	C++14	100 / 100	465 ms	31828 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define all(fl) fl.begin(),fl.end()
#define pb push_back
#define fi first
#define se second
#define for1(i,j,k) for(int i=j;i<=k;i++)
#define for2(i,j,k) for(int i=j;i>=k;i--)
#define for3(i,j,k,l) for(int i=j;i<=k;i+=l)
#define lb lower_bound
#define ub upper_bound
#define sz(a) (int)a.size()
#define pii pair<int,int>
#define pli pair<long long,int>
#define gcd __gcd
#define lcm(x,y) x*y/__gcd(x,y)
#define pil pair<int,long long>
const int maxn=5e5+9;
pii a[maxn];
struct IT{
vector<int>st;
void resz(int n){
st.resize(4*n+9);
for1(i,1,4*n)st[i]=-2e9;
}
void update(int id,int l,int r,int u,int val){
if (l>u||r<u)return;
if (l==r){
    st[id]=val;
    return;
}
int mid=(l+r)/2;
update(id*2,l,mid,u,val);
update(id*2+1,mid+1,r,u,val);
st[id]=max(st[id*2],st[id*2+1]);
}
int get(int id,int l,int r,int u,int v){
if (l>v||r<u||u>v)return -2e9;
if (u<=l&&r<=v)return st[id];
int mid=(l+r)/2;
return max(get(id*2,l,mid,u,v),get(id*2+1,mid+1,r,u,v));
}
};
int id[maxn];
IT st1,st2;//st1 low st2 high
int n;
bool check(int id){
if (st1.get(1,1,n,1,id-1)>=a[id].fi+a[id].se)return 1;
if (st2.get(1,1,n,id+1,n)>=a[id].se-a[id].fi)return 1;
return 0;
}
signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    //freopen("temp.INP","r",stdin);
    //freopen("temp.OUT","w",stdout);
    cin>>n;
    for1(i,1,n)cin>>a[i].fi>>a[i].se;
    sort(a+1,a+1+n);
    for1(i,1,n)id[i]=i;
    sort(id+1,id+1+n,[](int i,int j){
    if (a[i].se==a[j].se)return a[i].fi>a[j].fi;
    return a[i].se>a[j].se;
    });
    st1.resz(n),st2.resz(n);
    int ans=0;
    for1(i,1,n){
    ans+=(check(id[i])==0);
    st1.update(1,1,n,id[i],a[id[i]].fi+a[id[i]].se);
    st2.update(1,1,n,id[i],a[id[i]].se-a[id[i]].fi);
    }
    cout<<ans;
}

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