Submission #884822

#	Time	Username	Problem	Language	Result	Execution time	Memory
884822		banhcuon14	Exhibition (JOI19_ho_t2)	C++14	100 / 100	37 ms	1652 KiB

joi2019_ho_t2

#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
typedef pair<int,int > pii;
typedef long long ll;
const int mod = 1e9 + 7;
const int maxn = 5 + 1e5;
int n, m;
namespace subtask3 {
	void solve() {
		vector<pair<int,int > > a(n);
		vector<int > c(m);
		for (int i = 0; i < n; ++i) {
			cin >> a[i].first >> a[i].second;
		}
		for (int i = 0; i < m; ++i) {
			cin >> c[i];
		}
		sort(c.begin(),c.end());
		sort(a.begin(),a.end(),[] (const pii& a, const pii& b) {
			if (a.second != b.second) return a.second < b.second;
			return a.first < b.first;
		});
		int res = 0;
		for (int i = n-1; i >= 0 && res < m; --i) {
			if (c[m - res - 1] >= a[i].first) ++res;
		}
		cout << res;
	}
}


signed main()
{
	#define name "task"
	if (fopen(name".inp", "r")) {
		freopen(name".inp", "r", stdin);
		freopen(name".out", "w", stdout);
	}
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	cin >> n >> m;
	subtask3::solve();
	cerr << "Time Elasped: " << fixed << setprecision(3) << 1.0*clock()/CLOCKS_PER_SEC << '\n';
	return 0;
}

Compilation message (stderr)

joi2019_ho_t2.cpp: In function 'int main()':
joi2019_ho_t2.cpp:39:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |   freopen(name".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t2.cpp:40:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |   freopen(name".out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 40 / 40
• Subtask 3: 50 / 50