题目描述

贪心

import java.util.*;

public class Main {

    static class Pair {
        int x, y;

        public Pair(int x, int y) {
            this.x = x;
            this.y = y;
        }
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        Pair[] a = new Pair[n];
        for (int i = 0; i < n; i++) {
            int w = scanner.nextInt();
            int s = scanner.nextInt();
            a[i] = new Pair(w + s, w);
        }

        // 使用lambda表达式进行比较并排序
        Arrays.sort(a, (x, y) -> x.x - y.x);

        int res = Integer.MIN_VALUE;
        int sum = 0;
        for (int i = 0; i < n; i++) {
            int w = a[i].y;
            int s = a[i].x - w;
            res = Math.max(res, sum - s);
            sum += w;
        }

        System.out.println(res);
    }
}