LeetCode 504. Base 7
2017-02-14 22:57
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504. Base 7
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].
题目大意:给一个整数,以字符串形式返回它的7进制~
分析:如果num等于0则直接return 0,如果num小于0则变为相反数,且标记sign为-,每次将对num 取余 7的结果插入result字符串的最前面,并将num / 7,最后返回sign + result的字符串结果~
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].
题目大意:给一个整数,以字符串形式返回它的7进制~
分析:如果num等于0则直接return 0,如果num小于0则变为相反数,且标记sign为-,每次将对num 取余 7的结果插入result字符串的最前面,并将num / 7,最后返回sign + result的字符串结果~
class Solution { public: string convertToBase7(int num) { if (num == 0) return "0"; string sign = ""; if (num < 0) { num = 0 - num; sign = "-"; } string result = ""; while (num != 0) { result = to_string(num % 7) + result; num = num / 7; } return sign + result; } };
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