Submission #884816

#	Time	Username	Problem	Language	Result	Execution time	Memory
884816		banhcuon14	Exhibition (JOI19_ho_t2)	C++14	100 / 100	41 ms	1632 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;
struct info{
	int s, v;
	info(int _s = 0, int _v = 0): s(_s), v(_v) {};
	bool operator < (const info& other) const {
		return v < other.v;
	}
};
vector<info > a;
vector<int > c;
namespace subtask1{
	bool used[maxn];
	int res;
	void Try(int pos, vector<pair<int,int>>& v, int sz, int prev) {
		if (pos >= sz) {
			res = max(res, sz);
			return;
		}
		for (int i = 0; i < (int) c.size(); ++i) {
			if (!used[i] && c[i] >= prev && c[i] >= v[pos].fi ) {
				used[i] = true;
				Try(pos + 1, v, sz, c[i]);
				used[i] = false;
			}
		}
	}
	bool cmpA(info& a, info& b) {
		if (a.v != b.v) return a.v < b.v;
		return a.s < b.s;
	}
	void solve() {
		cin >> n >> m;
		a.resize(n+2, info());
		c.resize(m+2);
		for (int i = 0; i < n; ++i) {
			cin >> a[i].s >> a[i].v;
		}
		for (int i = 0; i < m; ++i) {
			cin >> c[i];
		}
		sort(a.begin(), a.begin()+n, cmpA);
		for (int mask = 1; mask < (1<<n); ++mask) {
			vector <pair<int,int > > v;
			for (int i = 0; i < n; ++i) {
				if ((mask>>i)&1) {
					v.push_back(make_pair(a[i].s,a[i].v));
				}
			}
			memset(used, false, m + 2);
			Try(0, v, (int) v.size(), -1);
		}
		cout << res;
	}
}
namespace subtask2 {
	int dp[maxn];
	void solve() {
		cin >> n >> m;
		a.resize(n+2, info());
		c.resize(m+2);
		for (int i = 1; i <= n; ++i) {
			cin >> a[i].s >> a[i].v;
		}
		for (int i = 1; i <= m; ++i) {
			cin >> c[i];
		}
		sort(c.begin() + 1, c.begin() + m + 1);
		sort(a.begin() + 1, a.begin() + n + 1);
		for (int j = 1; j <= n; ++j) {
			int i = lower_bound(c.begin() + 1, c.begin() + m + 1, a[j].s) - c.begin();
			int mx = 0, tmp;
			for(int k = 1; k < i; ++k) mx = max(dp[k], mx);
			for (int k = i; k <= m; ++k) {
				tmp = dp[k];
				dp[k] = max(dp[k], mx + 1);
				mx = max(mx, tmp);
			}
		}
		cout << dp[m];
	}
}
namespace subtask3 {
	void solve() {
		cin >> n >> m;
		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);
	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:120:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  120 |   freopen(name".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t2.cpp:121:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  121 |   freopen(name".out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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