PAT (Advanced Level) Practice 1077 Kuchiguse （20 分）（C++）（甲级）

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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

using namespace std;
#include<algorithm>
#include<iostream>
#include<cstdio>
#include<cstring>

string str, kuchiguse;

int main()
{
	int N = 0;
	scanf("%d", &N);
	getchar();
	getline(cin, kuchiguse);//输入第一个字符串，最长后缀必是第一个字符串的子串
	int len1 = kuchiguse.size();//PAT不能用gets，只好用getline了
	int i, j, k, flag = 0;
	for (i = 1; i < N; i++)
	{
		getline(cin, str);//剩下的字符串用来和第一和匹配
		int len2 = str.size();
		for (j = len1 - 1, k = len2 - 1; j >= flag && k >= 0; j--, k--)
		{
			if (kuchiguse[j] != str[k]) break;//不匹配则跳出
		}
		flag = j + 1;//flag标记最长公共后缀字第一个字符所在位置
	}
	if (flag < len1)//若存在公共子串则打印输出
	{
		while (flag < len1) printf("%c", kuchiguse[flag++]);
	}
	else printf("nai");//否则输出“奈~” 大概是日语没有的意思吧hhhhhhhh
	return 0;
}