swift - 查找 [String : [Int]] Swift dictionary 中的最大数字

Question

我是 Swift 的新手。我在使用此代码时遇到错误，并且在此站点上找不到任何答案。我打印最大数量，但我想打印最大数量的种类。

let interestingNumbers = [
    "Prime": [2,3,5,7,11,13],
    "Fibonacci": [1,1,2,3,5,8,13],
    "Square": [1,4,9,16,25,36]
]

var largestNumber = 0

for (kind, numbers) in interestingNumbers {
    for x in numbers {
        for y in kind {
            if x > largestNumber {
                largestNumber = x
            }
        }
    }
}

print("the largest number is = \(largestNumber)")

Answer 1

试试这个:

var largestNumber = 0
var largestNumberKind: String!

for (kind, numbers) in interestingNumbers {
    for x in numbers {
        if x > largestNumber {
            largestNumber = x
            largertNumberKind = kind
        }
    }
}

print("the largest number is = \(largestNumber)")
print("the largest number kind is = \(largestNumberKind)")

关于您的原始代码:

• 您只跟踪了最大的数字，丢失了您想要的信息。我添加的 largestNumberKind 变量就是这样做的。
• 遍历 kind: String 没有任何意义(for y in kind 行)。您的外部循环已经一次迭代一个键，因此这样的内部循环毫无意义。