#547 · #3711 · Maximum Transactions Without Negative Balance(最大交易次数（无负余额）)

You are given an array transactions of costs and an initial balance. You may process the transactions in any order, but the running balance must never become negative. Return the maximum number of transactions that can be processed. Constraints: 1 <= transactions.length <= 10^5, 1 <= transactions[i] <= 10^9, 0 <= balance <= 10^9.