Party Games UVA - 1610 贪心

题目：题目链接

思路：排序后处理到第一个不同的字符，贪心一下就可以了

AC代码：

 #include <iostream>
 #include <cstdio>
 #include <cstring>
 #include <algorithm>
 #include <string>
 #include <vector>
 #include <map>
 #include <set>

 #define FRER() freopen("in.txt", "r", stdin)
 #define FREW() freopen("out.txt", "w", stdout)

 #define INF 0x3f3f3f3f

 using namespace std;

 int main()
 {
     //FRER();
     //FREW();
     vector<string> vec;
     string str, ptr;
     int n;
     while(cin >> n && n) {
         vec.clear();
         for(int i = ; i < n; ++i) {
             cin >> str;
             vec.push_back(str);
         }
         sort(vec.begin(), vec.end());
         int b = n / , a = b - ;
         str = vec[a];
         ptr = vec[b];
         int len = min(str.length(), ptr.length());
         bool ok = true;
         string s = "", tmp;
         for(int i = ; i < len; ++i) {
             if(str[i] == ptr[i])
                 s += str[i];
             else {
                 tmp = s + (char)(str[i] + );
                 if(tmp == ptr) {
                     s += str[i++];
                     while(i < str.length() -  && str[i] == 'Z')
                         s += str[i++];
                     if(i < str.length() - )
                         s += (char)(str[i] + );
                     else
                         s = str;
                 }
                 else {
                     if(tmp.length() == str.length())
                         s = str;
                     else
                         s = tmp;
                 }
                 break;
             }
         }
         cout << s << endl;
     }
     return ;
 }