Submission #1281807

#	Time	Username	Problem	Language	Result	Execution time	Memory
1281807		muhammad-ahmad	Advertisement 2 (JOI23_ho_t2)	C++20	69 / 100	2096 ms	70852 KiB

Main

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

#define int long long
#define endl '\n'

void solve(){
	int n; cin >> n;
	int X[n + 1] = {}, E[n + 1] = {};
	
	bool Sub1 = 1, Sub2 = (n <= 16);
	
	for (int i = 1; i <= n; i++){
		cin >> X[i] >> E[i];
		if (i > 1 && E[i] != E[i - 1]) Sub1 = 0;
	}
	
	if (Sub1){
		map<int, int> C;
		int ans = 0;
		for (int i = 1; i <= n; i++){
			C[X[i]]++;
			if (C[X[i]] == 1) ans++;
		}
		cout << ans << endl;		
		return;
	}
	else if (Sub2){
		int ans = 16;
		for (int i = 1; i <= (1LL << n); i++){
			vector<int> x;
			for (int j = 0; j < n; j++){
				if ((i >> j) & 1) x.push_back(j + 1);
			}
			bool vis[n + 1] = {};
			for (auto j : x){
				for (int k = 1; k <= n; k++){
					if (abs(X[k] - X[j]) <= E[j] - E[k]) vis[k] = 1;
				}
			}
			
			int pos = 0;
			
			for (int j = 1; j <= n; j++) pos += vis[j];
			if (pos == n) ans = min(ans, (int)x.size());
		}
		cout << ans << endl;
		return;
	}
	
	map<int, vector<int>> C;
	int ans = 0;
	vector<int> a;
	for (int i = 1; i <= n; i++){
		C[E[i]].push_back(i);
		if (C[E[i]].size() == 1) a.push_back(E[i]);
	}
	int vis[n + 1] = {};
	sort(rbegin(a), rend(a));
	vector<int> o;
	for (auto v : a){
		for (auto i : C[v]){
			for (auto j : o){
				if (vis[j] == 1 && abs(X[j] - X[i]) <= E[j] - E[i]) {vis[i] = 2; break;}
			}
			if (vis[i] == 0){
				o.push_back(i);
				vis[i] = 1;
				ans++;
			}
		}
	}

	// for (int i = 1; i <= n; i++) cout << vis[i] << ' ';
	// cout << endl;
	
	cout << ans << endl;
	
}

signed main(){
	int tc = 1;
	// cin >> tc;
	while (tc--){
		solve();
	}
}

• Subtask 1: 10 / 10
• Subtask 2: 23 / 23
• Subtask 3: 36 / 36
• Subtask 4: 0 / 31