You are given a 0-indexed 2D integer array transactions, where transactions[i] = [costi, cashbacki].
The array describes transactions, where each transaction must be completed exactly once in some order. At any given moment, you have a certain amount of money. In order to complete transaction i, money >= costi must hold true. After performing a transaction, money becomes money - costi + cashbacki.
Return the minimum amount of money required before any transaction so that all of the transactions can be completed regardless of the order of the transactions.
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Example 1:
\n\n\nInput: transactions = [[2,1],[5,0],[4,2]]\nOutput: 10\nExplanation:\nStarting with money = 10, the transactions can be performed in any order.\nIt can be shown that starting with money < 10 will fail to complete all transactions in some order.\n\n\n
Example 2:
\n\n\nInput: transactions = [[3,0],[0,3]]\nOutput: 3\nExplanation:\n- If transactions are in the order [[3,0],[0,3]], the minimum money required to complete the transactions is 3.\n- If transactions are in the order [[0,3],[3,0]], the minimum money required to complete the transactions is 0.\nThus, starting with money = 3, the transactions can be performed in any order.\n\n\n
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Constraints:
\n\n1 <= transactions.length <= 105transactions[i].length == 20 <= costi, cashbacki <= 109给你一个下标从 0 开始的二维整数数组 transactions，其中transactions[i] = [costi, cashbacki] 。
数组描述了若干笔交易。其中每笔交易必须以 某种顺序 恰好完成一次。在任意一个时刻，你有一定数目的钱 money ，为了完成交易 i ，money >= costi 这个条件必须为真。执行交易后，你的钱数 money 变成 money - costi + cashbacki 。
请你返回 任意一种 交易顺序下，你都能完成所有交易的最少钱数 money 是多少。
\n\n
示例 1：
\n\n\n输入：transactions = [[2,1],[5,0],[4,2]]\n输出：10\n解释：\n刚开始 money = 10 ，交易可以以任意顺序进行。\n可以证明如果 money < 10 ，那么某些交易无法进行。\n\n\n
示例 2：
\n\n\n输入：transactions = [[3,0],[0,3]]\n输出：3\n解释：\n- 如果交易执行的顺序是 [[3,0],[0,3]] ，完成所有交易需要的最少钱数是 3 。\n- 如果交易执行的顺序是 [[0,3],[3,0]] ，完成所有交易需要的最少钱数是 0 。\n所以，刚开始钱数为 3 ，任意顺序下交易都可以全部完成。\n\n\n
\n\n
提示：
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