Submission #1811347

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Source Code Expand

import java.util.Arrays;
import java.util.Scanner;

class event implements Comparable<event>{
		public int a;
		public int b;
		public event(int a , int b){
			this.a = a;
			this.b = b;
		}
		
		public int compareTo(event other){
			// return b - other.b;
			return Integer.compare(b , other.b);
		}
		
}

public class Main{


	
	public static void main(String[] args) {
			
			long mod = 10^9+7;
			
			Scanner in = new Scanner(System.in);
			int n = in.nextInt();
			int size[] = new int[2];
			event[] a = new event[2*n];
			
		    for (int x=0; x < 2; x++)
		    	for (int i=0; i< n; i++)
		    		a[i+x*n] = new event(x, in.nextInt());
		    
			Arrays.sort(a);
	
			long res = 1;
			for(event e : a){
				if(size[1 - e.a] > 0){
					res *= size[1 - e.a];
					res %= mod;
					size[1 - e.a]--;
				}else{
					size[e.a]++;
				}
				
			}
			
			System.out.println(res);
			
			
	}

}

Submission Info

Judge Result