백준 1026

package baekjoon.그리디;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.Comparator;
import java.util.StringTokenizer;

class Main1026 {

   public static void main(String[] args) throws Exception {
      BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
      StringTokenizer st;
      int N = Integer.parseInt(br.readLine());
      Integer[] A = new Integer[N];
      Integer[] B = new Integer[N];
      st = new StringTokenizer(br.readLine());
      for (int i = 0; i < N; i++) {
         A[i] = Integer.parseInt(st.nextToken());
      }
      st = new StringTokenizer(br.readLine());
      for (int i = 0; i < N; i++) {
         B[i] = Integer.parseInt(st.nextToken());
      }

      Arrays.sort(A);
      Arrays.sort(B, Comparator.reverseOrder());

      int ans = 0;
      for (int i = 0; i < N; i++) {
         ans += A[i] * B[i];
      }
      System.out.println(ans);
   }
}