P1678 烦恼的高考志愿 二分

import java.util.Arrays;
import java.util.Scanner;public class Main {public static void main(String[] args) {Scanner sc = new Scanner(System.in);int n = sc.nextInt();int m = sc.nextInt();int[] a = new int[n+1];//学校int[] b = new int[m+1];//学生for(int i=1;i<=n;i++) {a[i] = sc.nextInt();}for(int i=1;i<=m;i++) {b[i] = sc.nextInt();}Arrays.sort(a,1,n+1);Arrays.sort(b,1,m+1);long sum = 0;for(int i=1;i<=m;i++) {//枚举学生int l = 1, r = n;while(l<r) {int mid = (l+r)/2;if(a[mid]>=b[i]) r = mid;else l = mid+1;}//找到第一个大于等于学生分数的学校if(l == 1)sum+=a[1]-b[i];if(l>=2)sum+=Math.min(Math.abs(a[l]-b[i]),Math.abs(a[l-1]-b[i]));}System.out.println(sum);}
}