Submission #878480

#	Time	Username	Problem	Language	Result	Execution time	Memory
878480		phoenix0423	Advertisement 2 (JOI23_ho_t2)	C++17	100 / 100	450 ms	39396 KiB

Main

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pll;
#define fastio ios::sync_with_stdio(false), cin.tie(0)
#define FOR(i, a, b) for(int i = (a); i < (b); i++)
#define REP(i, n) FOR(i, 0, n)
#define ALL(x) (x).begin(), (x).end()
#define pb push_back
#define eb emplace_back
#define f first
#define s second
const int maxn = 2e5 + 5;

int main(void){
	fastio;
	int n;
	cin>>n;
	vector<pll> a;
	map<int, int> mp;
	for(int i = 0; i < n; i++){
		int x, y;
		cin>>x>>y;
		mp[x] = max(mp[x], y);
	}
	for(auto [x, y] : mp) a.eb(x, y);
	n = a.size();
	vector<int> cov(n, 1);
	int mx = a[0].s;
	for(int i = 1; i < n; i++){
		mx -= a[i].f - a[i - 1].f;
		if(mx >= a[i].s) cov[i] = 0;
		else mx = a[i].s;
	}
	mx = a[n - 1].s;
	for(int i = n - 2; i >= 0; i--){
		mx -= a[i + 1].f - a[i].f;
		if(mx >= a[i].s) cov[i] = 0;
		else mx = a[i].s;
	}
	cout<<accumulate(ALL(cov), 0)<<"\n";
}

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