单词替换

• 做之前不知道有个字符串输入流(stringstream)可以读取字符串中的整除串

#include<iostream>
#include<sstream>
#include<cstring>

using namespace std;

int main(){
    
    string s,a,b;
    
    getline(cin,s);
    
    cin>>a>>b;
    
    stringstream ssin(s);    //定义字符串输入流输入字符串s(当成cin用)
    
    string str;
    
    while(ssin>>str){
        
        if(str==a)cout<<b<<" ";
        
        else cout<<str<<" ";
    }
}

• 之前用哈希表实现的代码

#include<iostream>
#include<cstring>
#include<map>

using namespace std;

int main(){
    
    string s;
    
    getline(cin,s);
    
    string a,b;
    
    cin>>a>>b;
    
    map<int,string> has;
    
    int idx=0;
    
    int len=s.size();
    
    string key;
    
    for(int i=0;i<len;i++){
        
        if(s[i]==' '){
            
            if(key.size())has[idx++]=key;
            
            key="";
            
            while(s[i]==' '&&i<len&& s[i+1]==' ')i++;
        }
        
        else key+=s[i];
    }
    
    if(key.size())has[idx++]=key;
    
    for(int i=0;i<idx;i++){
        
        if(has[i]==a)has[i]=b;
        
        cout<<has[i]<<" ";
    }
    
}