Question

我正在玩HackerRank。我需要从行读取到整数数组的问题之一：

A=(1,2,3)
B=(1,4,7)

我试过了：

let line = readLine()
print(line)

但是我收到了这个错误：

solution.swift:2:7: warning: expression implicitly coerced from 'String?' to Any
print(line)
      ^~~~
solution.swift:2:7: note: provide a default value to avoid this warning
print(line)
      ^~~~
           ?? <#default value#>
solution.swift:2:7: note: force-unwrap the value to avoid this warning
print(line)
      ^~~~
          !
solution.swift:2:7: note: explicitly cast to Any with 'as Any' to silence this warning
print(line)
      ^~~~
           as Any

你们中的任何人都知道我怎么读线并获得数组？

我真的很感谢你的帮助

Answer 1

let line = readLine()!

print(line)

//To Array, should work. Wrote it real quick
let array = readLine()!.characters.split(" ").map( { String($0)! } )

Answer 2

如果您要将String从readLine转换为Integer数组，则可以使用：

let array = readLine()!.split{ $ == " " }.map{ Int(String($0)) }

您不能：

let array = readLine()!.split{ $ == " " }.map{Int($0)}

因为$0是一个可选的字符数组类型（我认为），Int不会解析。

Answer 3

我用下面的线为我工作。

 var arr = readLine()!.components(separatedBy: " ").map{(a: String)->(Int) in
    return Int(a)!
}

Swift：HackerRank readLine一个Int数组

3 个答案: