AtCoder Beginner Contest 286——B - Cat

AtCoder Beginner Contest 286 题目讲解

A题 B题 C题 D题 E题

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蒟蒻来讲题，还望大家喜。若哪有问题，大家尽可提！

Hello, 大家好哇！本初中生蒟蒻今天讲解一下AtCoder Beginner Contest 286的B题——Cat

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原题

Problem Statement

You are given a string $S$ of length $N$.

Find the string obtained by replacing all contiguous occurrences of $na$ in S with $nya$.

Constraints

• $N$ is an integer between $1$ and $1000$, inclusive.
• $S$ is a string of length $N$ consisting of lowercase English letters.

Input

The input is given from Standard Input in the following format:

N
S

Output

Print the answer.

Sample Input 1

4
naan

Sample Output 1

nyaan

Replacing all contiguous occurrences of $na$ in naan with $nya$ results in the string $nyaan$.

Sample Input 2

4
near

Sample Output 2

near

S may not contain a contiguous na.

Sample Input 3

8
national

Sample Output 3

nyationyal

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思路

循环并判断是否是$na$，若是输出$nya$，否则输出$s_i$

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代码

#include 

using namespace std;

int n;
string s;

int main()
{
	cin >> n >> s;
	
	s = ' ' + s;
	
	for (int i = 1; i <= n; i ++)	
		if (s[i] == 'n' && s[i + 1] == 'a') //如果是
			cout << "nya", i ++; //因为下一个a不用判断了，直接i++
		else//不是
			cout << s[i];

	return 0;
}

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今天就到这里了！

大家有什么问题尽管提，我都会尽力回答的！最后，除夕夜祝大家新年快乐！

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