제출 #1272461

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1272461		wedonttalkanymore	Matryoshka (JOI16_matryoshka)	C++20	0 / 100	0 ms	332 KiB

matryoshka

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

#define int long long
#define pii pair<ll, ll>
#define fi first
#define se second

const ll N = 2e5 + 5, inf = 1e18, mod = 1e9 + 7, block = 320, lim = 19;

int n;
pii a[N];
int q;
vector <pii> have;

bool cmp(pii x, pii y) {
	if (x.fi == y.fi) return x.se > y.se;
	return x.fi > y.fi;
}

void solve() {
	sort(have.begin(), have.end(), cmp);
	multiset <int> s;
	for (int i = 0; i < have.size();) {
		int l = i;
		multiset <int> news;
		while(l < have.size() && have[l].fi == have[i].fi) {
			auto it = s.upper_bound(have[l].se);
			if (it != s.end()) {
				s.erase(it);
				news.insert(have[l].se);
			}
			else news.insert(have[l].se);
			l++;
		}
		for (auto x : news) s.insert(x);
		i = l;
	}
	cout << s.size() << '\n';
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    if (fopen(".inp", "r")) {
        freopen(".inp", "r", stdin);
        freopen(".out", "w", stdout);
    }
    cin >> n;
    for (int i = 1; i <= n; i++) {
    	cin >> a[i].fi >> a[i].se;
	}
	cin >> q;
	for (int i = 1; i <= q; i++) {
		int x, y;
		cin >> x >> y;
		have.clear();
		for (int j = 1; j <= n; j++) {
			if (a[j].fi >= x && a[j].se <= y) {
				have.push_back({a[j].fi, a[j].se});
			}
		}
		solve();
	}
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

matryoshka.cpp: In function 'int main()':
matryoshka.cpp:48:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |         freopen(".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~
matryoshka.cpp:49:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |         freopen(".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 15
• Subtask 3: 0 / 25
• Subtask 4: 0 / 49