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);    //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