PAT--1077. Kuchiguse

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

题解

最长公共后缀。

#include <bits/stdc++.h>using namespace std;int n;vector<string> lines;int main(){    cin >> n;    cin.ignore();    string s;    int minlen = 300;    for(int i = 0; i < n; ++i){        getline(cin, s);        minlen = min(minlen, (int)s.length());        lines.push_back(string(s.rbegin(), s.rend()));    }    string ans;    for(int i = 0; i < minlen; ++i){        char ch = lines[0][i];        bool flag = 0;        for(int j = 0; j < lines.size(); ++j){            if(lines[j][i] != ch){                flag = 1;                break;            }        }        if(!flag) ans.push_back(ch);        else{            break;        }    }    if(ans.empty()) cout << "nai" << endl;     else{        string t = string(ans.rbegin(), ans.rend());        cout << t << endl;    }    return 0;}