Submission #742918

#	Time	Username	Problem	Language	Result	Execution time	Memory
742918		zaneyu	Advertisement 2 (JOI23_ho_t2)	C++14	100 / 100	1096 ms	42328 KiB

Main

#include<bits/stdc++.h>
using namespace std;
using ll=long long;
using ld=long double;
using pii=pair<int,int>;
#define f first
#define s second
#define pb push_back
#define REP(i,n) for(int i=0;i<n;i++)
#define REP1(i,n) for(int i=1;i<=n;i++)
#define FILL(n,x) memset(n,x,sizeof(n))
#define ALL(_a) _a.begin(),_a.end()
#define sz(x) (int)x.size()
#define SORT_UNIQUE(c) (sort(c.begin(),c.end()),c.resize(distance(c.begin(),unique(c.begin(),c.end()))))
const ll maxn=5e5+5;
const ll maxlg=__lg(maxn)+2;
const ll INF64=4e18;
const int INF=0x3f3f3f3f;
const int MOD=1e9+7;
const ld PI=acos(-1);
const ld eps=1e-4;
#define lowb(x) x&(-x)
#define MNTO(x,y) x=min(x,(__typeof__(x))y)
#define MXTO(x,y) x=max(x,(__typeof__(x))y)
pii arr[maxn];
map<int,int> mp;
struct seg{
	int seg[4*maxn];
	void upd(int idx,int l,int r,int p,int x){
		if(r<p or l>p) return;
		int mid=(l+r)/2;
		MXTO(seg[idx],x);
		if(l==r) return;
		upd(idx*2,l,mid,p,x);
		upd(idx*2+1,mid+1,r,p,x);
	}
	int query(int idx,int l,int r,int ql,int qr){
		int mid=(l+r)/2;
		if(r<ql or l>qr) return -INF;
		if(ql<=l and r<=qr) return seg[idx];
		return max(query(idx*2,l,mid,ql,qr),query(idx*2+1,mid+1,r,ql,qr));
	}
}seg,seg2;
int main(){
	int n;
	cin>>n;
	vector<int> dsc;
	REP(i,n){
		cin>>arr[i].s>>arr[i].f;
		dsc.pb(arr[i].s);
	}
	SORT_UNIQUE(dsc);
	REP(i,sz(dsc)) mp[dsc[i]]=i;
	sort(arr,arr+n);
	reverse(arr,arr+n);
	multiset<int> ms;
	int ans=0;
	REP(i,n){
		int p=mp[arr[i].s];
		//cout<<seg.query(1,0,n-1,0,p)<<' ';
		if(seg.query(1,0,n-1,0,p)>=arr[i].s+arr[i].f or seg2.query(1,0,n-1,p,n-1)>=arr[i].f-arr[i].s+INF) continue;
		seg.upd(1,0,n-1,p,arr[i].s+arr[i].f);
		seg2.upd(1,0,n-1,p,arr[i].f-arr[i].s+INF);
		++ans;
	}
	cout<<ans<<'\n';
}

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