Submission #332732

#	Time	Username	Problem	Language	Result	Execution time	Memory
332732		limabeans	Exhibition (JOI19_ho_t2)	C++17	100 / 100	57 ms	4608 KiB

joi2019_ho_t2

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

template<typename T>
void out(T x) { cout << x << endl; exit(0); }
#define watch(x) cout << (#x) << " is " << (x) << endl





using ll = long long;





const int inf = 2e9;




void print(vector<int> a, int n) {
    for (int i=0; i<n; i++) {
	cout<<a[i]<<" ";
    }
    cout<<endl;
}

int main() {
    ios_base::sync_with_stdio(false); cin.tie(0);  cout.tie(0);


    
    int n, m;
    cin>>n>>m;
    
    vector<pair<int,int>> a(n); // (val, size)
    
    for (int i=0; i<n; i++) {
	cin>>a[i].second>>a[i].first;
    }

    sort(a.begin(), a.end());

    vector<int> w(m);
    for (int i=0; i<m; i++) {
	cin>>w[i];
    }

    sort(w.begin(),w.end());

    int ans = 0;
    int ptr = n-1;
    
    for (int i=m-1; i>=0 && ptr>=0; i--) {
	while (ptr>=0 && a[ptr].second > w[i]) ptr--;
	if (ptr>=0) {
	    --ptr;
	    ans++;
	}
    }


    cout<<ans<<endl;    
    return 0;
}

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