Submission #2263462

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Source Code Expand

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

#define int long long

#define rep(i,n) for(int i=0;i<(n);i++)
#define pb push_back
#define all(v) (v).begin(),(v).end()
#define fi first
#define se second
typedef vector<int>vint;
typedef pair<int,int>pint;
typedef vector<pint>vpint;

template<typename A,typename B>inline void chmin(A &a,B b){if(a>b)a=b;}
template<typename A,typename B>inline void chmax(A &a,B b){if(a<b)a=b;}

const int mod=1000000007;


signed main(){
    int N;
    cin>>N;
    vpint v;
    rep(i,N){
        int a;cin>>a;
        v.pb({a,0});
    }
    rep(i,N){
        int a;cin>>a;
        v.pb({a,1});
    }
    sort(all(v));
    int s=0;

    int ans=1;
    rep(i,v.size()){
        if(!v[i].se){
            if(s<0)ans=ans*(-s)%mod;
            s++;
        }
        else{
            if(s>0)ans=ans*s%mod;
            s--;
        }
    }
    cout<<ans<<endl;
    return 0;
}

Submission Info

Judge Result