PAT - 甲级 - 1077. Kuchiguse (20)(字符串处理)

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

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给定条件：
1.给定n句话

要求：
1.求出这些话的最长相同后缀

求解：
1.首先将所有字符串反转，方便比较
2.以第一句话为基准，分别用其他话来比较
3.只要有一句不相同，则跳出比较，从0位置到当前位置前一位就是最长的相同后缀（可能为0）

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#include 
#include 
#include 
#include 
#define min(a,b) (a) > (b)?(b):(a)
using namespace std;

int n, len = 9999999;
string s[105];
vector v;
int main() {
	scanf("%d", &n);
	getchar();
	for(int i = 0; i < n; i++) {
		getline(cin, s[i]);
		reverse(s[i].begin(), s[i].end());
		len = min(len, s[i].length());
	}

	for(int i = 0; i < len; i++) {
		int flag = 1;
		char temp = s[0][i];
		for(int j = 1; j < n; j++) {
			if(s[j][i] != temp) {
				flag = 0;
				break;
			}
		}
		if(flag == 1) {
			v.push_back(temp);
		} else {
			break;
		}
	}
	if(v.size() == 0) {
		printf("nai\n");
	} else {
		for(int i = v.size()-1; i >= 0; i--) {
			printf("%c", v[i]);
		}
		printf("\n");
	}

	return 0;
}

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