Submission #1263398

#	Time	Username	Problem	Language	Result	Execution time	Memory
1263398		tminh	Exhibition (JOI19_ho_t2)	C++20	0 / 100	0 ms	328 KiB

joi2019_ho_t2

#include "bits/stdc++.h"
using namespace std;

#define task ""
#define ll long long
#define endl '\n'
#define fi first
#define se second
#define vall(a) (a).begin(), (a).end()
#define sze(a) (int)a.size()
#define pii pair<int, int>
#define pll pair<ll, ll>


#define ep emplace_back
#define pb push_back
#define pf push_front


const ll mod = 1e9 + 7;
const int N = 1e6 + 5;
const ll oo = 1e18;

bool START;

int n, m, ans = 0;
ll b[N];
pll a[N];
multiset<ll> s;

inline void solve() {
	sort(a + 1, a + 1 + n);
	sort(b + 1, b + 1 + m);
	int j = 1;
	
	ll last = -oo;
	for (int i = 1; i <= m; ++i) {
		while(j <= n && a[j].fi <= b[i]) {
			s.insert(a[j].se);
			++j;
		}
		auto nxt = s.lower_bound(last);
		if (nxt != s.end()) {
			last = *nxt;
			s.erase(nxt);
			++ans;
		}
	}
	cout << ans;
}


inline void input() {
    cin >> n >> m;
    for (int i = 1; i <= n; ++i) cin >> a[i].fi >> a[i].se;
    for (int i = 1; i <= m; ++i) cin >> b[i];
    return solve();
}
bool END;

int main() {
    if(fopen(task ".inp", "r")) {
        freopen(task ".inp", "r", stdin);
        freopen(task ".out", "w", stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);

    input();
    
    
    cerr << endl << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << 's' << endl;
    cerr << "Memory: " << fabs ((&END - &START)) / 1048576.0 << "MB\n";
    return 0;
}

Compilation message (stderr)

joi2019_ho_t2.cpp: In function 'int main()':
joi2019_ho_t2.cpp:63:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |         freopen(task ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t2.cpp:64:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |         freopen(task ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 40
• Subtask 3: 0 / 50