PAT Advanced 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). 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 <algorithm>
#include <stack>
using namespace std;

int main()
{
    int T,min=1000;
    cin>>T;
    string s[T];
    getline(cin,s[0]);
    stack<char> sta;
    for(int i=0;i<T;i++){
        getline(cin,s[i]);
        reverse(s[i].begin(),s[i].end());
        if(min>s[i].length()) min=s[i].length();
    }
    bool isSame;
    for(int i=0;i<min;i++){
        isSame=true;
        for(int j=0;j<T;j++){
            if(s[j][i]!=s[0][i]) isSame=false;
        }
        if(isSame) sta.push(s[0][i]);
        else break;
        /**不相同直接break掉，这边是一个失误点
        失误案例   abddnai
                    aaaanai*/
    }
    if(sta.empty()) cout<<"nai";
    while(!sta.empty()){
        cout<<sta.top();
        sta.pop();
    }
    system("pause");
    return 0;
}