Submission #2443852

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Source Code Expand

#include <iostream>
#include <vector>
#include <algorithm>
#include <utility>
#include <cmath>

using namespace std;
typedef pair<int,int> P;
typedef long long ll;
ll N,a;
ll inf = 1e9+7;

int main(){
	cin >> N;
	vector<P> v(2*N);
	for(int i=0;i<2*N;i++){
		if(i<N){
			cin >> a;
			v[i] = P(a,1);
		}else{
			cin >> a;
			v[i] = P(a,-1);
		}
	}
	sort(v.begin(),v.end());
	ll  c = 0;
	ll ans = 1;
	for(int i=0;i<2*N;i++){
		if(c*v[i].second>=0){
			c += v[i].second;
		}else{
			(ans *= abs(c))%inf;
			if(c>0) c--;
			else c++;
		}
	}
	cout << ans << endl;
}

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