PAT Advanced

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). 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

可能太久不用Java写东西了，感觉有点爽，之前乙级用cpp写了

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = Integer.parseInt(sc.nextLine()), minLen = 99999999;
        String[] str = new String[n];
        for(int i = 0; i < n; i++) {
            str[i] = new StringBuilder(sc.nextLine()).reverse().toString();
            if(str[i].length() < minLen) minLen = str[i].length();
        }
        for(int i = 0; i < minLen; i++) {
            boolean same = true;
            for(int j = 1; j < n; j++) 
                if(str[j].charAt(i) != str[j-1].charAt(i)) {
                    same = false;
                    break;
                }
            if(!same) {
                minLen = i;
                break;
            }
        }
        if(minLen == 0) System.out.println("nai");
        else System.out.println(new StringBuilder(str[0].substring(0,minLen)).reverse());
    }
}