PAT 1077 Kuchiguse (20)

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

题目大意：找出字符串末尾想的的部分；
思路：因为每个字符串的长度不一致，所以在输入的时候， 把每一个字符串颠倒一下
     输入的时候，找到最短字符串的长度
     遍历每个字符串，查看有多少个连续的相等的字符串；
注意点：在输入整数n后必须用cin.get()把换行符吸收掉；否则会被当做第一个字符串输入
       在末尾相等子串的长度的时候， 必须n个字符串都相等， 才能把长度+1

#include<iostream>
#include<string>
#include<algorithm>
using namespace std;
int main(){
  int n, i;
  cin>>n;
  cin.get();
  string s[100];
  int minn=99999999;
  for(i=0; i<n; i++){
    getline(cin, s[i]);
    reverse(s[i].begin(), s[i].end());
 
    if(s[i].size()<minn) minn = s[i].size();
  }
  int cnt=0, f=1;
  for(i=0; i<minn&&f; i++){
    f = 1;
    for(int j=0; j<n-1; j++){
        if(s[j][i]!=s[j+1][i]){
            f=0;
              break;
        }
    }
    if(f) cnt++;
  }
 
  if(cnt==0) cout<<"nai"<<endl;
  else{
    s[0] = s[0].substr(0, cnt);
    reverse(s[0].begin(), s[0].end());
    cout<<s[0]<<endl;
  }
  return 0;
}