当前位置： 面试刷题>> 最大订单 (经典算法题500道)
### 完整题目描述
**题目名称**： 最大订单金额问题
**题目描述**：
给定一个订单列表，每个订单包含订单ID、顾客ID、订单金额等信息。现在需要编写一个程序，找出哪个顾客的订单总金额最大，并返回该顾客的ID以及他们的订单总金额。
**输入**：
- 一个包含多个订单的数组，每个订单是一个包含`orderId`（订单ID，字符串类型）、`customerId`（顾客ID，字符串类型）、`amount`（订单金额，数字类型）等字段的对象。
**输出**：
- 一个包含顾客ID和该顾客订单总金额的对象，如果有多个顾客的总金额相同且最大，则返回其中任意一个的结果即可。
**示例输入**：
```json
[
{"orderId": "1", "customerId": "A", "amount": 100},
{"orderId": "2", "customerId": "B", "amount": 150},
{"orderId": "3", "customerId": "A", "amount": 200},
{"orderId": "4", "customerId": "C", "amount": 120}
]
```
**示例输出**：
```json
{"customerId": "A", "totalAmount": 300}
```
### PHP 示例代码
```php
$maxAmount) {
$maxAmount = $customerSums[$order['customerId']];
$maxCustomerId = $order['customerId'];
}
}
return ["customerId" => $maxCustomerId, "totalAmount" => $maxAmount];
}
// 示例输入
$orders = [
["orderId" => "1", "customerId" => "A", "amount" => 100],
["orderId" => "2", "customerId" => "B", "amount" => 150],
["orderId" => "3", "customerId" => "A", "amount" => 200],
["orderId" => "4", "customerId" => "C", "amount" => 120]
];
// 调用函数并打印结果
$result = findMaxOrderCustomer($orders);
echo json_encode($result);
?>
```
### Python 示例代码
```python
def find_max_order_customer(orders):
customer_sums = {}
max_amount = 0
max_customer_id = ''
for order in orders:
customer_id = order['customerId']
if customer_id not in customer_sums:
customer_sums[customer_id] = 0
customer_sums[customer_id] += order['amount']
if customer_sums[customer_id] > max_amount:
max_amount = customer_sums[customer_id]
max_customer_id = customer_id
return {"customerId": max_customer_id, "totalAmount": max_amount}
# 示例输入
orders = [
{"orderId": "1", "customerId": "A", "amount": 100},
{"orderId": "2", "customerId": "B", "amount": 150},
{"orderId": "3", "customerId": "A", "amount": 200},
{"orderId": "4", "customerId": "C", "amount": 120}
]
# 调用函数并打印结果
result = find_max_order_customer(orders)
print(result)
```
### JavaScript 示例代码
```javascript
function findMaxOrderCustomer(orders) {
let customerSums = {};
let maxAmount = 0;
let maxCustomerId = '';
orders.forEach(order => {
const customerId = order.customerId;
if (!customerSums[customerId]) {
customerSums[customerId] = 0;
}
customerSums[customerId] += order.amount;
if (customerSums[customerId] > maxAmount) {
maxAmount = customerSums[customerId];
maxCustomerId = customerId;
}
});
return { customerId: maxCustomerId, totalAmount: maxAmount };
}
// 示例输入
const orders = [
{ orderId: "1", customerId: "A", amount: 100 },
{ orderId: "2", customerId: "B", amount: 150 },
{ orderId: "3", customerId: "A", amount: 200 },
{ orderId: "4", customerId: "C", amount: 120 }
];
// 调用函数并打印结果
const result = findMaxOrderCustomer(orders);
console.log(JSON.stringify(result));
```
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