Submission #2825763

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Source Code Expand

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.*;

public class Main {

    static int N;
    static int[] A;
    static int[] B;

    static int MOD = 1_000_000_007;

    public static void main(String[] args) {
        FastScanner sc = new FastScanner(System.in);
        N = sc.nextInt();
        A = sc.nextIntArray(N);
        B = sc.nextIntArray(N);
        System.out.println( solve() );
    }

    static long solve() {
        Arrays.sort(A);
        Arrays.sort(B);

        long ans = 1;
        int ai = 0;
        int bi = 0;
        int ab = 0;
        while(ai != N && bi != N) {
            int a = A[ai];
            int b = B[bi];

            if( a < b ) {
                ai++;
                if( ab < 0 ) {
                    ans = ans * (ab*-1) % MOD;
                }
                ab++;

            } else {
                bi++;
                if( ab > 0 ) {
                    ans = ans * ab % MOD;
                }
                ab--;
            }
        }

        ans = ans * Math.abs(ab) % MOD;

        return ans;
    }

    @SuppressWarnings("unused")
    static class FastScanner {
        private BufferedReader reader;
        private StringTokenizer tokenizer;
        FastScanner(InputStream in) {
            reader = new BufferedReader(new InputStreamReader(in));
            tokenizer = null;
        }
        String next() {
            if (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }
        String nextLine() {
            if (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    return reader.readLine();
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken("\n");
        }
        long nextLong() {
            return Long.parseLong(next());
        }
        int nextInt() {
            return Integer.parseInt(next());
        }
        int[] nextIntArray(int n) {
            int[] a = new int[n];
            for (int i = 0; i < n; i++)
                a[i] = nextInt();
            return a;
        }
        long[] nextLongArray(int n) {
            long[] a = new long[n];
            for (int i = 0; i < n; i++)
                a[i] = nextLong();
            return a;
        }
    }
}

Submission Info

Judge Result