2043. 简易银行系统.md

2043. 简易银行系统

题目传送门

点击这里

解题思路

这种订单、支付系统等设计应该考虑到的是线程安全问题，比如两个线程同时操作一个变量，要加锁，而且也要做到一方减少，另一方增加，二者同时发生同时结束，这个和mysql的一致性原则还有原子性很类似。但这道题是个单线程，只需要模拟即可。

代码

type Bank struct {
	balance []int64
}


func Constructor(balance []int64) Bank {
	return Bank{
		balance: balance,
	}
}


func (this *Bank) Transfer(account1 int, account2 int, money int64) bool {
	if account1 > len(this.balance) || account2 > len(this.balance) || this.balance[account1-1] < money {
		return false
	}
	this.balance[account1-1] -= money
	this.balance[account2-1] += money
	return true
}


func (this *Bank) Deposit(account int, money int64) bool {
	if account > len(this.balance) {
		return false
	}
	this.balance[account-1] += money
	return true
}


func (this *Bank) Withdraw(account int, money int64) bool {
	if account > len(this.balance) || this.balance[account-1] < money {
		return false
	}
	this.balance[account-1] -= money
	return true
}


/**
 * Your Bank object will be instantiated and called as such:
 * obj := Constructor(balance);
 * param_1 := obj.Transfer(account1,account2,money);
 * param_2 := obj.Deposit(account,money);
 * param_3 := obj.Withdraw(account,money);
 */