PAT甲级——A1077 Kuchiguse

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 <string>
 #include <vector>
 #include <algorithm>
 using namespace std;
 int N;
 int main()
 {
     cin >> N;
     string res = "", str;
     vector<string>v;
     int minL = ;
     getchar();
     for (int i = ; i < N; ++i)
     {
         getline(cin, str);
         reverse(str.begin(), str.end());
         v.push_back(str);
         minL = minL < str.length() ? minL : str.length();
     }
     bool flag = true;
     for (int i = ; i < minL && flag; ++i)
     {
         for (int j = ; j < N && flag; ++j)
         {
             if (v[][i] != v[j][i])
                 flag = false;
         }
         if (flag)
             res += v[][i];
     }
     reverse(res.begin(), res.end());
     if (res.length() == )
         cout << "nai" << endl;
     else
         cout << res << endl;

     return ;
 }