1077 Kuchiguse （PAT甲级）

#include 
#include 
#include 
#include 

int N, sz, length;
std::string line;
std::vector vec;

int main(){
    std::cin >> N;
    getline(std::cin, line);
    sz = 257;
    for(int i = 0; i < N; ++i){
        getline(std::cin, line);
        reverse(line.begin(), line.end());
        vec.push_back(line);
        if(line.size() < sz){
            sz = line.size();
        }
    }
    length = sz;
    for(int i = 0; i < sz; ++i){
        char c = vec[0][i];
        for(int j = 1; j < N; ++j){
            if(vec[j][i] != c){
                length = i;
                i = sz;
                break;
            }
        }
    }
    if(length == 0){
        std::cout << "nai";
    } else{
        line = vec[0].substr(0, length);
        reverse(line.begin(), line.end());
        std::cout << line;
    }
    return 0;
}

题目如下：

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