[Swift]LeetCode504. 七进制数 | Base 7

概述Given an integer, return its base 7 string representation. Example 1: Input: 100Output: "202"  Example 2: Input: -7Output: "-10"  Note: The input will be in range of [-1e7, 1e7].  给定一个整数，将其转化为

Given an integer,return its base 7 string representation.

Example 1:

input: 100Output: "202"

 Example 2:

input: -7Output: "-10"

 Note: The input will be in range of [-1e7,1e7].

 给定一个整数，将其转化为7进制，并以字符串形式输出。

示例 1:

输入: 100输出: "202"

示例 2:

输入: -7输出: "-10"

注意: 输入范围是 [-1e7,1e7] 。

 16ms

 1 class Solution { 2     func convertToBase7(_ num: Int) -> String { 3         if num == 0 {return "0"} 4         var res:[Int] = [Int]() 5         //取绝对值 6         var number:Int = abs(num) 7         while(number != 0) 8         { 9             var temp:Int = number % 710             number /= 711             //在位置0处插入12             res.insert(temp,at: 0)13         }14         //数组转字符串15         let dataInt = res.map(String.init)      16         var str:String = dataInt.joined(separator: "")17         if num < 018         {19             str = "-" + str20         }21         return str22     }23 }

8ms

 1 class Solution { 2     func convertToBase7(_ num: Int) -> String { 3         var input = abs(num) 4  5         var result = "" 6  7         if num == 0 { 8             return "0" 9         }10 11         while input >= 1 {12             result = "\(input % 7)" + result13             input = input / 714         }15 16         if num < 0 {17             result = "-" + result18         }19 20         return result21     }22 }

12ms

 1 class Solution { 2     func convertToBase7(_ num: Int) -> String { 3         if num == 0 { return "0" } 4         let number = abs(num) 5         var result = "" 6         var x = number 7         while x > 0 { 8             let rem = x % 7 9             result = "\(rem)\(result)"10             x = x / 711         }12         13         return num < 0 ? "-\(result)" : result14     }15 }

20ms

 1 class Solution { 2     func convertToBase7(_ num: Int) -> String { 3         if num < 0 { 4             return "-" + convertToBase7(-num) 5         } 6  7         var res = "" 8         var num = num 9 10         while num >= 7 {11             res = String(num % 7) + res12             num /= 713         }14         res = String(num) + res15 16         return res17     }18 }

24ms

 1 class Solution { 2     func convertToBase7(_ num: Int) -> String { 3         guard num != 0 else { 4             return "0" 5         } 6         var num = num 7         var flag = true 8         if num < 0 { 9             flag = false10             num = -num11         }12         var result = ""13         while num > 0 {14             result = "\(num % 7)" + result15             num = num / 716         }17         return flag ? result : ("-" + result)18     }19 }

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