add: leetcode 2043 solution

leetcode/2043.Simple-Bank-System/2043.Simple Bank System.go

@@ -0,0 +1,44 @@
+package leetcode
+
+type Bank struct {
+	accounts []int64
+	n        int
+}
+
+func Constructor(balance []int64) Bank {
+	return Bank{
+		accounts: balance,
+		n:        len(balance),
+	}
+}
+
+func (this *Bank) Transfer(account1 int, account2 int, money int64) bool {
+	if account1 > this.n || account2 > this.n {
+		return false
+	}
+	if this.accounts[account1-1] < money {
+		return false
+	}
+	this.accounts[account1-1] -= money
+	this.accounts[account2-1] += money
+	return true
+}
+
+func (this *Bank) Deposit(account int, money int64) bool {
+	if account > this.n {
+		return false
+	}
+	this.accounts[account-1] += money
+	return true
+}
+
+func (this *Bank) Withdraw(account int, money int64) bool {
+	if account > this.n {
+		return false
+	}
+	if this.accounts[account-1] < money {
+		return false
+	}
+	this.accounts[account-1] -= money
+	return true
+}