제출 #1260203

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1260203		mingga	Advertisement 2 (JOI23_ho_t2)	C++20	100 / 100	418 ms	18236 KiB

Main

// Author: caption_mingle
#include "bits/stdc++.h"

using namespace std;

#define ln "\n"
#define pb push_back
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define sz(x) ((int)(x).size())
#define ll long long
const int mod = 1e9 + 7;
const int inf = 2e9;
const int N = 5e5 + 7;
int n, f[N];

pair<int, int> a[N];

vector<int> vx, vy;

struct SEGTREE {
	vector<int> st;
	int n;
	SEGTREE() {}
	SEGTREE(int n) : n(n) {
		st.resize(n * 4 + 4, 0);
	}
	void update(int i, int l, int r, int u, int x) {
		if(l > u or r < u) return ;
		if(l == r) {
			st[i] = x;
			return;
		}
		int m = (l + r) >> 1;
		update(i * 2, l, m, u, x);
		update(i * 2 + 1, m + 1, r, u, x);
		st[i] = max(st[i * 2], st[i * 2 + 1]);
	}
	int get(int i, int l, int r, int u, int v) {
		if(l > v or r < u) return 0;
		if(u <= l and r <= v) return st[i];
		int m = (l + r) >> 1;
		return max(get(i * 2, l, m, u, v), get(i * 2 + 1, m + 1, r, u, v));
	}
};

signed main() {
	cin.tie(0) -> sync_with_stdio(0);
	#define task ""
	if(fopen(task ".INP", "r")) {
		freopen(task ".INP", "r", stdin);
		freopen(task ".OUT", "w", stdout);
	}
	cin >> n;
	for(int i = 1; i <= n; i++) {
		int x, e; cin >> x >> e;
		a[i].fi = e - x;
		a[i].se = e + x;
		vx.pb(e - x);
		vy.pb(e + x);
	}
	sort(all(vx));
	vx.erase(unique(all(vx)), vx.end());
	sort(all(vy));
	vy.erase(unique(all(vy)), vy.end());
	for(int i = 1; i <= n; i++) {
		a[i].fi = upper_bound(all(vx), a[i].fi) - vx.begin();
		a[i].se = upper_bound(all(vy), a[i].se) - vy.begin();
	}
	sort(a + 1, a + n + 1);
	int m = sz(vy);
	SEGTREE st(m);
	for(int i = 1; i <= n; i++) {
		int pre = st.get(1, 1, m, a[i].se + 1, m);
		f[i] = f[pre] + 1;
		st.update(1, 1, m, a[i].se, i);
	}
	cout << f[n];
    cerr << "\nTime: " << clock() * 1000 / CLOCKS_PER_SEC;
}

컴파일 시 표준 에러 (stderr) 메시지

Main.cpp: In function 'int main()':
Main.cpp:52:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |                 freopen(task ".INP", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:53:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   53 |                 freopen(task ".OUT", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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