题解 | 小红的优惠券

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

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String inStr = sc.nextLine();
        int cost = Integer.parseInt(inStr.split(" ")[0]);// 花的钱
        int n = Integer.parseInt(inStr.split(" ")[1]);// n张优惠券
        int[] arr = new int[n];
        for (int i = 0; i < n; i++) {
            String inStr1 = sc.nextLine();
            int money = Integer.parseInt(inStr1.split(" ")[0]);
            int money1 = Integer.parseInt(inStr1.split(" ")[1]);
            if(money <= cost) {
                arr[i] = money1;
            }
        }
        Arrays.sort(arr);
        System.out.println(cost-arr[arr.length-1]);
    }
}