PTA (Advanced Level)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

思路

• 读进来的时候反转字符串，然后找最长公共前缀就好了

代码

#include<bits/stdc++.h>
using namespace std;
vector<string> v;
int main()
{
    int n;
    scanf("%d\n", &n);    //注意要把换行符也读进来
    int shortest = 500;
    string s;
    for(int i=0;i<n;i++)
    {
        getline(cin, s);
        if(s.size() < shortest) shortest = s.size();
        reverse(s.begin(), s.end());
        v.push_back(s);
    }

    bool right;
    int index = 0;
    for(int i=0;i<shortest;i++)
    {
        char ch = v[0][i];
        right = true;
        for(int j=1;j<n;j++)
        {
            if(v[j][i] != ch)
            {
                right = false;
                break;
            }
        }
        if(right)   index++;
        else    break;
    }

    if(index == 0)
        cout << "nai";
    else
        for(int i=index-1;i>=0;i--)
            cout << v[0][i];
    return 0;
}

引用

https://pintia.cn/problem-sets/994805342720868352/problems/994805390896644096