A. Set of Strings

Time Limit: 20 Sec  Memory Limit: 256 MB

题目连接

http://codeforces.com/contest/544/problem/A

Description

You are given a string q. A sequence of k strings s₁, s₂, …, s_k is called beautiful, if the concatenation of these strings is string q (formally, s₁ + s₂ + … + s_k = q) and the first characters of these strings are distinct.

Find any beautiful sequence of strings or determine that the beautiful sequence doesn’t exist.

Input

The first line contains a positive integer k (1 ≤ k ≤ 26) — the number of strings that should be in a beautiful sequence.

The second line contains string q, consisting of lowercase Latin letters. The length of the string is within range from 1 to 100, inclusive.

Output

If such sequence doesn’t exist, then print in a single line “NO” (without the quotes). Otherwise, print in the first line “YES” (without the quotes) and in the next k lines print the beautiful sequence of strings s₁, s₂, …, s_k.

If there are multiple possible answers, print any of them.

Sample Input

1
abca

Sample Output

YES
abca

HINT

In the second sample there are two possible answers: {“aaaca“, ”s“} and {“aaa“, ”cas“}.

题意

把一个字符串能不能拆成N份，要求每一份的开头字母都不相同

题解：

统计一下有多少个不同的字母，如果小于n，那就直接输出no

否则就输出这些分开的字符串就好了~

代码：

//qscqesze
#include <cstdio>
#include <cmath>
#include <cstring>
#include <ctime>
#include <iostream>
#include <algorithm>
#include <set>
#include <vector>
#include <sstream>
#include <queue>
#include <typeinfo>
#include <fstream>
#include <map>
#include <stack>
typedef long long ll;
using namespace std;
//freopen("D.in","r",stdin);
//freopen("D.out","w",stdout);
#define sspeed ios_base::sync_with_stdio(0);cin.tie(0)
#define maxn 1000001
#define mod 10007
#define eps 1e-9
int Num;
char CH[];
//const int inf=0x7fffffff;   //нчоч╢С
const int inf=0x3f3f3f3f;
/*inline void P(int x)
{
    Num=0;if(!x){putchar('0');puts("");return;}
    while(x>0)CH[++Num]=x%10,x/=10;
    while(Num)putchar(CH[Num--]+48);
    puts("");
}
*/
inline ll read()
{
    int x=,f=;char ch=getchar();
    while(ch<''||ch>''){if(ch=='-')f=-;ch=getchar();}
    while(ch>=''&&ch<=''){x=x*+ch-'';ch=getchar();}
    return x*f;
}
inline void P(int x)
{
    Num=;if(!x){putchar('');puts("");return;}
    while(x>)CH[++Num]=x%,x/=;
    while(Num)putchar(CH[Num--]+);
    puts("");
}
//**************************************************************************************string s;
map<char,int> H;
int flag[maxn];
int main()
{
    int n=read();
    int ans=;
    cin>>s;
    for(int i=;i<s.size();i++)
    {
        if(H[s[i]])
            continue;
        H[s[i]]=;
        flag[ans]=i;
        ans++;
    }
    if(ans<n)
    {
        puts("NO");
        return ;
    }
    puts("YES");
    for(int j=;j<n-;j++)
    {
        for(int i=flag[j];i<flag[j+];i++)
            cout<<s[i];
        cout<<endl;
    }
    for(int i=flag[n-];i<s.size();i++)
        cout<<s[i];
    cout<<endl;
}