A1077

1077 Kuchiguse (20分)

The Japanese language is notorious for its sentence ending particles. Personal preference of such particles can be considered as a reflection of the speaker’s personality. Such a preference is called “Kuchiguse” and is often exaggerated artistically in Anime and Manga. For example, the artificial sentence ending particle “nyan~” is often used as a stereotype for characters with a cat-like personality:

Itai nyan~ (It hurts, nyan~)

Ninjin wa iyada nyan~ (I hate carrots, nyan~)

Now given a few lines spoken by the same character, can you find her Kuchiguse? 

Input Specification:
Each input file contains one test case. For each case, the first line is an integer N (2≤N≤100). Following are N file lines of 0~256 (inclusive) characters in length, each representing a character’s spoken line. The spoken lines are case sensitive.

Output Specification:
For each test case, print in one line the kuchiguse of the character, i.e., the longest common suffix of all N lines. If there is no such suffix, write nai.

Sample Input 1:

3
Itai nyan~
Ninjin wa iyadanyan~
uhhh nyan~

Sample Output 1:

nyan~

Sample Input 2:

3
Itai!
Ninjinnwaiyada T_T
T_T

Sample Output 2:

nai

#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<queue>
#include<cstdio>
#include<algorithm>
using namespace std;

int main(){
    int N;
    string max,s[101];
    cin>>N;
    getchar();
    for(int i=0;i<N;i++){
        getline(cin,s[i]);
    }
    for(int i=1;i<1005;i++){
        string temp;
        int is=1;
        for(int k=1;k<=i;k++){
            temp.push_back(s[0][s[0].size()-k]);
        }
        for(int j=1;j<N;j++){
            string str;
            for(int l=1;l<=i;l++){
                str.push_back(s[j][s[j].size()-l]);
            }
            if(str!=temp||s[0].size()<=max.size()||s[j].size()<=max.size()){
                is=0;
                break;
            }
        }
        if(is)max=temp;
        else break;
    }
    reverse(max.begin(),max.end());
    if(max.size())cout<<max;
    else cout<<"nai"<<endl;
    return 0;
}