浙大机试2014：Kuchiguse

http://www.patest.cn/contests/pat-a-practise/1077

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 <stdio.h>
#include <string.h>
typedef struct{
	char p[280];
	int len;
}SPOKE;
SPOKE s[100];
int main(){
	int n,i,minlen,j;
	char ch;
	int mismatch = 0;
	scanf("%d",&n);
	getchar();
	for(i = 0;i < n;i++){
		gets(s[i].p);
		s[i].len = strlen(s[i].p);
	}
	minlen = s[0].len;
	for(i = 1;i < n;i++){
		if(minlen > s[i].len)
			minlen = s[i].len;
	}
	for(i = 1;i <= minlen;i++){
		ch = s[0].p[s[0].len-i];
		for(j = 1;j < n;j++){
			if(s[j].p[s[j].len-i] != ch){
				mismatch = 1;
				break;
			}
		}
		if(mismatch)
			break;
	}
	if(i == 1)
		printf("nai");
	else
		printf("%s",&s[0].p[s[0].len-i+1]);
	return 0;
}