Submission #925475

#	Time	Username	Problem	Language	Result	Execution time	Memory
925475		jcelin	Advertisement 2 (JOI23_ho_t2)	C++14	100 / 100	403 ms	22960 KiB

Main

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;

typedef pair<int,int> ii;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<ll> vll;
typedef vector<pll> vpll;

#define PB push_back
#define PF push_front
#define PPB pop_back
#define PPF pop_front
#define X first
#define Y second
#define MP make_pair
#define all(x) (x).begin(), (x).end()

const int mod = 1e9 + 7; //998244353;
const int inf = 1e9 + 7;
const ll INF = 1e18 + 7;
const int logo = 20;
const int MAXN = 1e6 + 7;
const int off = 1 << logo;
const int trsz = off << 1;
const int dx[] = {1, -1, 0, 0};
const int dy[] = {0, 0, -1, 1};

vi vals;
vii p;

struct tournament{
	int seg[trsz];
	
	tournament(){
		fill(seg, seg + trsz, -1);
	}
	
	void update(int x, int vl){
		x += off;
		seg[x] = max(seg[x], vl);
		for(x /= 2; x; x /= 2) seg[x] = max(seg[x * 2], seg[x * 2 + 1]);
	}
	
	int query(int l, int r){
		int ret = -1;
		for(l += off, r += off; l < r; l >>= 1, r >>= 1){
			if(l & 1) ret = max(ret, seg[l++]);
			if(r & 1) ret = max(ret, seg[--r]);
		}
		return ret;
	}
}t;

bool cmp(ii &a, ii &b){
	return a.Y - a.X > b.Y - b.X;
}

void solve(){
	int n;
	cin >> n;
	for(int i=1; i<=n; i++){
		int x, e;
		cin >> x >> e;
		vals.PB(x - e);
		vals.PB(x + e);
		p.PB({x - e, x + e});
	}
	sort(all(vals));
	vals.erase(unique(all(vals)), vals.end());
	for(auto &x : p){
		x.X = lower_bound(all(vals), x.X) - vals.begin() + 1;
		x.Y = lower_bound(all(vals), x.Y) - vals.begin() + 1;
	}
	sort(all(p), cmp);
	
	int ans = 0;
	for(auto &x : p){
		if(t.query(0, x.X + 1) >= x.Y) continue;
		t.update(x.X, x.Y);
		ans++;
	}
	cout << ans << "\n";
}

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	int tt = 1;
	//cin >> tt;
	while(tt--) solve();
	return 0;
}

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