Given an integer, return its base 7 string representation.
Example 1:
Input: 100 Output: "202"
Example 2:
Input: -7 Output: "-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 % 7
10 number /= 7
11 //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 < 0
18 {
19 str = "-" + str
20 }
21 return str
22 }
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)" + result
13 input = input / 7
14 }
15
16 if num < 0 {
17 result = "-" + result
18 }
19
20 return result
21 }
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 / 7
11 }
12
13 return num < 0 ? "-\(result)" : result
14 }
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) + res
12 num /= 7
13 }
14 res = String(num) + res
15
16 return res
17 }
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 = false
10 num = -num
11 }
12 var result = ""
13 while num > 0 {
14 result = "\(num % 7)" + result
15 num = num / 7
16 }
17 return flag ? result : ("-" + result)
18 }
19 }
原文地址：https://www.cnblogs.com/strengthen/p/9809768.html
时间： 2024-10-15 00:51:46