Submission #1281832

#	Time	Username	Problem	Language	Result	Execution time	Memory
1281832		muhammad-ahmad	Advertisement 2 (JOI23_ho_t2)	C++20	59 / 100	2095 ms	12788 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);
	
	map<int, int> MA;
	
	for (int i = 1; i <= n; i++){
		cin >> X[i] >> E[i];
		if (E[MA[X[i]]] < E[i]) MA[X[i]] = 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));
	set<int> idx1, idx2;
	for (auto v : a){
		for (auto i : C[v]){
			
			auto it1 = lower_bound(idx1.begin(), idx1.end(), X[i]);
			auto it2 = lower_bound(idx2.begin(), idx2.end(), -X[i]);
			
			if (it1 != idx1.end()){
				int x = *it1;
				int j = MA[x];
				// cout << i << ' ' << j << endl;
				
				if (abs(X[j] - X[i]) <= E[j] - E[i]) vis[i] = 2;
			}
			
			if (it2 != idx2.end()){
				
				int x = *it2;
				x *= -1;
				int j = MA[x];
				
				if (abs(X[j] - X[i]) <= E[j] - E[i]) vis[i] = 2;
					// cout << i << ' ' << j << endl;
			}
			
			if (vis[i] == 0){
				
				// cout << i << endl;
				
				idx1.insert(X[i]);
				idx2.insert(-X[i]);
				vis[i] = 1;
				ans++;
			}
			// cout << '-' << endl;
		}
	}

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