PAT 甲级 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:

3Itai nyan~Ninjin wa iyadanyan~uhhh nyan~

Sample Output 1:

nyan~

Sample Input 2:

3Itai!Ninjinnwaiyada T_TT_T

Sample Output 2:

nai

#include <iostream>#include <algorithm>#include <string>using namespace std;int main() {int n;scanf("%d", &n);string ans;getchar();for (int i = 0; i < n; i++) {string s;getline(cin, s);int len = s.length();reverse(s.begin(), s.end());if (i == 0) {ans = s;continue;}else {int lenans = ans.length();int minlen = len < lenans ? len : lenans;for (int j = 0; j < minlen; j++) {if (ans[j] != s[j]) {ans = ans.substr(0, j);break;}}}}reverse(ans.begin(), ans.end());if (ans.length() == 0) ans = "nai";cout << ans << endl;return 0;}