PAT 甲级 1077 Kuchiguse (20 分)-蒲公英云

PAT 甲级 1077 Kuchiguse (20 分)

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<cstring>
#include<algorithm>
using namespace std;
int main()
{
    string com="",temp;
    int i,j,n,c,t;
    cin>>n;
    getchar();
    getline(cin,com);
    for(i=1;i<n;i++)
    {
        getline(cin,temp);
        c=com.length()-1;
        t=temp.length()-1;
        while(com[c]==temp[t])
        {
            c--;
            t--;
            if(c<0||t<0)  // 这点我错过
            break;
        }
        if(c==com.length()-1)
        {
            com="nai";
        }
        else
        {
            com=com.substr(c+1);
        }
    }
    cout<<com<<endl;
    return 0;
}