题解 | #单词替换#

#include <iostream>
#include <string>
using namespace std;
int main(){
    string str,str1,str2;
    while(getline(cin,str)){
        getline(cin,str1);
        getline(cin,str2);
        str = " " + str + " ";
        str1 = " " + str1 + " ";
        str2 = " " + str2 + " ";
        int found=0;
        while((found=str.find(str1,found))!=string::npos)
        {
            str.replace(found,str1.size(),str2);
        }
        cout<<str.substr(1,str.size()-2)<<endl;
    }
    return 0;
}