拼接所有的字符串产生字典序最小的字符串

往下翻，使用标准答案Pass这题吧。
错误答案：思想1，排序字符串组，值从低到高，合并，但是通不过测试。

#
#
# @param strs string字符串一维数组 the strings
# @return string字符串
#
class Solution:
    def minString(self, strs):
        strs.sort()
        return ''.join(strs)

标准答案：思想2，对任意两个字符串，按照 str1+str2 ≤ str2+str1方式排序。
用例通过率: 100.00% 运行时间: 179ms 占用内存: 7276KB。

#include <bits/stdc++.h>
using namespace std;
bool compare(string a, string b)
{
    return (a + b) < (b + a); // 按照 str1+str2 ≤ str2+str1方式排序。

}

class Solution
{
public:
    /**
     * 
     * @param strs string字符串vector the strings
     * @return string字符串
     */
    string minString(vector<string> &strs)
    {
        // write code here
        if (strs.empty())
        {
            return "";
        }
        sort(strs.begin(), strs.end(), compare);
        string res = "";
        for (int i = 0; i < strs.size(); ++i)
        {
            res += strs[i];
        }
        return res;
    }
};

我们来看看结果。
输入133个字符串的组。

omyxak nonfp gsfyk nbnpjku blbk y rf u v qzkgimg irpj uypbil ilmzhjq ribxv ama p ry p b hi fielz wdm pblyuzj qb eg hn ih updonk wvgdcgv fevu kal ypiepak owu nyb f k x g glvpcuy fqsao clmwwwn vbbaxf k uc qnmnqec ljp ojsvns c gbyyec kh syhcssa hxj aew iwcvs wipqpr p c ltlr c bni hyz b gzlmn uv vfewhvr qfmntlg ofej xurc hcgl riqw ad p acglhcb pzvhhoj fnjt jmdjrws dy lg wzdkvt mp c v yk dwb tve snuns x rptvuff bebi aqbzg ycnxn yxfna ezrk aixq e ggzolw vsz mtzsv jjpszez mt fepkoym wue iwcgq wrrmoau edkshxw dcpni lczih slgzic zaqwy hiaugfm ya bhrq dyydca yr d cutvf oelx aqvwxpa gzcswf xtveon lzviohc fv dszhzsw pdj bgcfg e cqmf nf lu iq njozyd xsdi dw

或者

["omyxak","nonfp","gsfyk","nbnpjku","blbk","y","rf","u","v","qzkgimg","irpj","uypbil","ilmzhjq","ribxv","ama","p","ry","p","b","hi","fielz","wdm","pblyuzj","qb","eg","hn","ih","updonk","wvgdcgv","fevu","kal","ypiepak","owu","nyb","f","k","x","g","glvpcuy","fqsao","clmwwwn","vbbaxf","k","uc","qnmnqec","ljp","ojsvns","c","gbyyec","kh","syhcssa","hxj","aew","iwcvs","wipqpr","p","c","ltlr","c","bni","hyz","b","gzlmn","uv","vfewhvr","qfmntlg","ofej","xurc","hcgl","riqw","ad","p","acglhcb","pzvhhoj","fnjt","jmdjrws","dy","lg","wzdkvt","mp","c","v","yk","dwb","tve","snuns","x","rptvuff","bebi","aqbzg","ycnxn","yxfna","ezrk","aixq","e","ggzolw","vsz","mtzsv","jjpszez","mt","fepkoym","wue","iwcgq","wrrmoau","edkshxw","dcpni","lczih","slgzic","zaqwy","hiaugfm","ya","bhrq","dyydca","yr","d","cutvf","oelx","aqvwxpa","gzcswf","xtveon","lzviohc","fv","dszhzsw","pdj","bgcfg","e","cqmf","nf","lu","iq","njozyd","xsdi","dw"]

算法思想1排序结果：
acglhcb ad aew aixq ama aqbzg aqvwxpa b b bebi bgcfg bhrq blbk bni c c c c clmwwwn cqmf cutvf d dcpni dszhzsw dw dwb dy dyydca e e edkshxw eg ezrk f fepkoym fevu fielz fnjt fqsao fv g gbyyec ggzolw glvpcuy gsfyk gzcswf gzlmn hcgl hi hiaugfm hn hxj hyz ih ilmzhjq iq irpj iwcgq iwcvs jjpszez jmdjrws k k kal kh lczih lg ljp ltlr lu lzviohc mp mt mtzsv nbnpjku nf njozyd nonfp nyb oelx ofej ojsvns omyxak owu p p p p pblyuzj pdj pzvhhoj qb qfmntlg qnmnqec qzkgimg rf ribxv riqw rptvuff ry slgzic snuns syhcssa tve u uc updonk uv uypbil v v vbbaxf vfewhvr vsz wdm wipqpr wrrmoau wue wvgdcgv wzdkvt x x xsdi xtveon xurc y ya ycnxn yk ypiepak yr yxfna zaqwy

算法思想2排序结果：
acglhcb ad aew aixq ama aqbzg aqvwxpa b b bebi bgcfg bhrq blbk bni c c c c clmwwwn cqmf cutvf dcpni d dszhzsw dwb dw dy dyydca edkshxw e e eg ezrk fepkoym fevu f fielz fnjt fqsao fv gbyyec g ggzolw glvpcuy gsfyk gzcswf gzlmn hcgl hiaugfm hi hn hxj hyz ih ilmzhjq iq irpj iwcgq iwcvs jjpszez jmdjrws kal kh k k lczih lg ljp ltlr lu lzviohc mp mt mtzsv nbnpjku nf njozyd nonfp nyb oelx ofej ojsvns omyxak owu pblyuzj pdj p p p p pzvhhoj qb qfmntlg qnmnqec qzkgimg rf ribxv riqw rptvuff ry slgzic snuns syhcssa tve uc updonk u uv uypbil vbbaxf vfewhvr vsz v v wdm wipqpr wrrmoau wue wvgdcgv wzdkvt xsdi xtveon xurc x x ya ycnxn yk ypiepak yr yxfna y zaqwy