Add solution and test-cases for problem 2043

Author: 0xff-dev

leetcode/2001-2100/2043.Simple-Bank-System/README.md

@@ -1,28 +1,41 @@
 # [2043.Simple Bank System][title]
 
-> [!WARNING|style:flat]
-> This question is temporarily unanswered if you have good ideas. Welcome to [Create Pull Request PR](https://github.com/kylesliu/awesome-golang-algorithm)
-
 ## Description
+You have been tasked with writing a program for a popular bank that will automate all its incoming transactions (transfer, deposit, and withdraw). The bank has `n` accounts numbered from `1` to `n`. The initial balance of each account is stored in a **0-indexed** integer array `balance`, with the `(i + 1)th` account having an initial balance of `balance[i]`.
 
-**Example 1:**
+Execute all the **valid** transactions. A transaction is **valid** if:
 
-```
-Input: a = "11", b = "1"
-Output: "100"
-```
+- The given account number(s) are between `1` and `n`, and
+- The amount of money withdrawn or transferred from is **less than or equal** to the balance of the account.
 
-## 题意
-> ...
+Implement the `Bank` class:
 
-## 题解
+- `Bank(long[] balance)` Initializes the object with the **0-indexed** integer array `balance`.
+- `boolean transfer(int account1, int account2, long money)` Transfers `money` dollars from the account numbered `account1` to the account numbered `account2`. Return `true` if the transaction was successful, `false` otherwise.
+- `boolean deposit(int account, long money)` Deposit `money` dollars into the account numbered account. Return `true` if the transaction was successful, `false` otherwise.
+- `boolean withdraw(int account, long money)` Withdraw `money` dollars from the account numbered `account`. Return `true` if the transaction was successful, `false` otherwise.
 
-### 思路1
-> ...
-Simple Bank System
-```go
-```
+**Example 1:**
 
+```
+Input
+["Bank", "withdraw", "transfer", "deposit", "transfer", "withdraw"]
+[[[10, 100, 20, 50, 30]], [3, 10], [5, 1, 20], [5, 20], [3, 4, 15], [10, 50]]
+Output
+[null, true, true, true, false, false]
+
+Explanation
+Bank bank = new Bank([10, 100, 20, 50, 30]);
+bank.withdraw(3, 10);    // return true, account 3 has a balance of $20, so it is valid to withdraw $10.
+                         // Account 3 has $20 - $10 = $10.
+bank.transfer(5, 1, 20); // return true, account 5 has a balance of $30, so it is valid to transfer $20.
+                         // Account 5 has $30 - $20 = $10, and account 1 has $10 + $20 = $30.
+bank.deposit(5, 20);     // return true, it is valid to deposit $20 to account 5.
+                         // Account 5 has $10 + $20 = $30.
+bank.transfer(3, 4, 15); // return false, the current balance of account 3 is $10,
+                         // so it is invalid to transfer $15 from it.
+bank.withdraw(10, 50);   // return false, it is invalid because account 10 does not exist.
+```
 
 ## 结语
 

leetcode/2001-2100/2043.Simple-Bank-System/Solution.go

@@ -1,5 +1,76 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+type Bank struct {
+	b  []int64
+	ok int
+}
+
+func Constructor(balance []int64) Bank {
+	// 0, 1, 2, 3, 4, 5
+	b := make([]int64, len(balance)+1)
+	for i := 1; i <= len(balance); i++ {
+		b[i] = balance[i-1]
+	}
+	return Bank{b: b, ok: len(balance)}
+}
+
+func (this *Bank) validateAccount(a int) bool {
+	return a >= 1 && a <= this.ok
+}
+
+func (this *Bank) Transfer(account1 int, account2 int, money int64) bool {
+	if !this.validateAccount(account1) || !this.validateAccount(account2) {
+		return false
+	}
+	have := this.b[account1]
+	if have >= money {
+		this.b[account1] -= money
+		this.b[account2] += money
+		return true
+	}
+	return false
+}
+
+func (this *Bank) Deposit(account int, money int64) bool {
+	if !this.validateAccount(account) {
+		return false
+	}
+	this.b[account] += money
+	return true
+}
+
+func (this *Bank) Withdraw(account int, money int64) bool {
+	// 0 ,1, 2, 3
+	if !this.validateAccount(account) {
+		return false
+	}
+	have := this.b[account]
+	if have >= money {
+		this.b[account] -= money
+		return true
+	}
+	return false
+}
+
+type action struct {
+	a        string
+	from, to int
+	money    int64
+}
+
+func Solution(balance []int64, actions []action) []bool {
+	c := Constructor(balance)
+	ans := make([]bool, len(actions))
+	for i, ac := range actions {
+		if ac.a == "t" {
+			ans[i] = c.Transfer(ac.from, ac.to, ac.money)
+			continue
+		}
+		if ac.a == "d" {
+			ans[i] = c.Deposit(ac.from, ac.money)
+			continue
+		}
+		ans[i] = c.Withdraw(ac.from, ac.money)
+	}
+	return ans
 }

leetcode/2001-2100/2043.Simple-Bank-System/Solution_test.go

@@ -9,31 +9,36 @@ import (
 func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
-		name   string
-		inputs bool
-		expect bool
+		name     string
+		balances []int64
+		actions  []action
+		expect   []bool
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", []int64{10, 100, 20, 50, 30}, []action{
+			{"w", 3, 0, 10},
+			{"t", 5, 1, 20},
+			{"d", 5, 0, 20},
+			{"t", 3, 4, 15},
+			{"w", 10, 0, 50},
+		}, []bool{true, true, true, false, false}},
 	}
 
 	//	开始测试
 	for i, c := range cases {
 		t.Run(c.name+" "+strconv.Itoa(i), func(t *testing.T) {
-			got := Solution(c.inputs)
+			got := Solution(c.balances, c.actions)
 			if !reflect.DeepEqual(got, c.expect) {
-				t.Fatalf("expected: %v, but got: %v, with inputs: %v",
-					c.expect, got, c.inputs)
+				t.Fatalf("expected: %v, but got: %v, with inputs: %v %v",
+					c.expect, got, c.balances, c.actions)
 			}
 		})
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }