Submission #1095907

#	Time	Username	Problem	Language	Result	Execution time	Memory
1095907		Phuoc	Exhibition (JOI19_ho_t2)	C++14	100 / 100	41 ms	5724 KiB

joi2019_ho_t2

#include <bits/stdc++.h>
#include <ctime>
#include <algorithm>
#include <random>

using namespace std;

#define el '\n'
#define ll long long
#define fi first
#define se second
#define BIT(mask, i) (((mask) >> (i)) & 1)
#define MASK(i) (1LL << (i))

const ll INF = (ll)1e18 + 9;
const int oo = (int)1e9 + 7;
const ll MOD = (ll)1e9 + 7;

template <class T1, class T2>
    bool minimize(T1 &a, T2 b) {
        if(a > b) {a = b; return true;} return false;
    }

template <class T1, class T2>
    bool maximize(T1 &a, T2 b) {
        if(a < b) {a = b; return true;} return false;
    }

template <class T1, class T2>
    void add (T1 &a, T2 b) {
        a += b;
        if (a >= MOD) a -= MOD;
    }

const int N = 100100;

int n, m;
pair <ll, ll> pics [N];
ll frames[N];

void init (void) {
	cin >> n >> m;
	for (int i = 1; i <= n; i++) cin >> pics[i].fi >> pics[i].se;
	for (int i = 1; i <= m; i++) cin >> frames[i];
}

int f[N];

bool cmp (pair <ll, ll> a, pair <ll, ll> b) {
	if(a.se != b.se) return a.se < b.se;
	else return a.fi < b.fi;  
}

void solve (void) {
	sort (pics + 1, pics + n + 1, cmp);
	int ans = 0;
	sort(frames + 1, frames + m + 1);
	int j = n;
	for (int i = m; i >= 1; i--) {
		while(frames[i] < pics[j].fi && j > 0) j--;
		// if(frames[i] >= pics[j].fi) {
		// 	ans++;
		// }
		if(j < 1) {
			cout << ans << el;
			return;
		}
		j--;
		ans++;
	}
	cout << ans;
}

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    #define test "test"
    // freopen (test".inp", "r", stdin);
    // freopen (test".out", "w", stdout);

    srand(time(0));

    int ntest = 1;
    // cin >> ntest;
    while(ntest--) {
        init();
        solve();
    }
    return 0;
}

// chim chim chim orz orz orz

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