uva 1610——Party Games

逃离我推掉我的手 2022-08-09 13:45 170阅读 0赞

题目链接：[http://acm.hust.edu.cn/vjudge/problem/viewProblem.action?id=51171][http_acm.hust.edu.cn_vjudge_problem_viewProblem.action_id_51171]

题意：给你n个串的集合D，然后求一个长度最短的串s，使得使得s大于等于D中一半的串，又同时小于另一半串。

思路：直接暴力。先对n个串排序，然后选择第n/2-1个串，从第一个字母开始找，在后面添加26个字母枚举，直至找到目标串。

code：

#include <iostream>
    #include <cstdio>
    #include <cmath>
    #include <algorithm>
    #include <cstring>
    #include <sstream>
    #include <string>
    #include <vector>
    #include <list>
    #include <queue>
    #include <stack>
    #include <map>
    #include <set>
    #include <bitset>
    
    using namespace std;
    
    typedef long long ll;
    typedef unsigned long long ull;
    typedef long double ld;
    
    const int INF=0x3fffffff;
    const int inf=-INF;
    const int N=1000000;
    const int M=2005;
    const int mod=1000000007;
    const double pi=acos(-1.0);
    
    #define cls(x,c) memset(x,c,sizeof(x))
    #define cpy(x,a) memcpy(x,a,sizeof(a))
    #define fr(i,s,n) for (int i=s;i<=n;i++)
    #define lson l,m,rt<<1
    #define rson m+1,r,rt<<1|1
    #define lrt  rt<<1
    #define rrt  rt<<1|1
    #define middle int m=(r+l)>>1
    #define lowbit(x) (x&-x)
    #define pii pair<int,int>
    #define mk make_pair
    #define IN freopen("in.txt","r",stdin);
    #define OUT freopen("out.txt","w",stdout);
    
    string s[M];
    int n;
    void sol()
    {
        sort(s,s+n);
        //fr(i,0,n-1) cout<<s[i]<<endl;
        string s1=s[n/2-1],s2=s[n/2],t="",p="";
        for (int i=0;;++i)
        {
            for (char c='A';c<='Z';++c)
            {
                    t=p+c;
                if(t>=s1&&t<s2){cout<<t<<endl;return;}
            }
            p+=s1[i];
        }
    }
    
    int main()
    {
        while (~scanf("%d",&n)&&n)
        {
            fr(i,0,n-1) cin>>s[i];
            sol();
        }
    }

[http_acm.hust.edu.cn_vjudge_problem_viewProblem.action_id_51171]: http://acm.hust.edu.cn/vjudge/problem/viewProblem.action?id=51171