README.md

Base 7

Description

Given an integer, return its base 7 string representation.

Example 1:

Input: 100
Output: "202"

Example 2:

   Output: "-10"

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

Tags: [no tags]

思路 1

判断一下0的情况和负数的符号 kotlin(192ms/100.00%):

class Solution {
    fun convertToBase7(num: Int): String {
        if (num == 0) return "0"
        val isPositive = num >= 0
        var n = Math.abs(num)
        val sb = StringBuilder()
        while (n > 0) {
            sb.append(n % 7)
            n /= 7
        }
        sb.append(if (isPositive) "" else "-")
        return sb.reverse().toString()
    }
}

结语

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