2021-07-22

the_subobo

于 2021-07-22 13:34:38 发布

阅读量153

点赞数 1

文章标签：字符串 c++

本文链接：https://blog.youkuaiyun.com/m0_54045571/article/details/118997057

版权

该程序实现了一个简单的字符串匹配功能，通过输入字符串n和目标子串pmt，判断n中是否包含pmt。如果找到，输出'AAAAAA'，否则输出'Abuchulaile'。程序利用了C++ std::string 的find方法，该方法从指定位置开始查找子串，并返回匹配的起始位置，若未找到则返回npos。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

字符串匹配

在这里插入图片描述

# include<iostream>
# include<string>
using namespace std;

string str;
int main(){
    const string pmt="114514";
    
    int n;
    cin >> n;
    while(n --){
        cin >> str;
        if(str.find(pmt) != string::npos)cout<<"AAAAAA"<<endl;
        else cout << "Abuchulaile" << '\n';
    }

    return 0;
}

std::basic_string<CharT,Traits,Allocator>::find

Finds the first substring equal to the given character sequence. Search begins at pos, i.e. the found substring must not begin in a position preceding pos.

The find() used for finding the first substring equal to str.
Parameters
str - string to search for
pos - position at which to start the search

std::basic_string<CharT,Traits,Allocator>::npos

This is a special value equal to the maximum value representable by the type size_type. The exact meaning depends on context, but it is generally used either as end of string indicator by the functions that expect a string index or as the error indicator by the functions that return a string index.

Note
Although the definition uses -1, size_type is an unsigned integer type, and the value of npos is the largest positive value it can hold, due to signed-to-unsigned implicit conversion. This is a portable way to specify the largest value of any unsigned type.