【LeetCode #179】Largest Number 解题报告
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原题链接:Largest Number
题目描述:
Given a list of non negative integers, arrange them such that they form the largest number.
For example, given [3, 30, 34, 5, 9], the largest formed number is 9534330.
Note: The result may be very large, so you need to return a string instead of an integer.
Solution:
- 易忽略全为0的情况
- 字符串比较算法
- tostring()的运用
- sort函数
代码:
class Solution{ public: //比较函数 static bool compare(string s1, string s2) { return (s1 + s2) > (s2 + s1); } string largestNumber(vector<int>& nums) { if(nums.empty()) return ""; vector<string> strNums; vector<int>::const_iterator iter = nums.begin(); while (iter != nums.end()) { //把整形转换成字符串类型 strNums.push_back(to_string((long long)*iter)); iter ++; } //借用sort函数对转换后的数字字符串排序 sort(strNums.begin(), strNums.end(),compare); string res = ""; vector<string>::const_iterator it = strNums.begin(); while(it != strNums.end()) { res.append(*it); it ++; } //输入的非负整数全部为0的情况下,输出一个0 int index = 0; while (index < res.length() && res[index] == '0') index ++; if (index == res.length()) return "0"; return res; }};
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