题解 | 单词替换

#include<iostream>
#include<algorithm>
#include<vector>
#include<string>
#include<set>
#include<cmath>
using namespace std;

int main()
{
    vector<string> arr;
    string s;
    while(getline(cin,s))
    {
        string ans;
        for(int i=0;i<s.size();i++)
        {
            if(s[i]!=' ')
            {
               ans+=s[i];
            }
            else{
                arr.push_back(ans);
                ans = "";
            }
        }
        arr.push_back(ans);
        string w1;
        string w2;
        getline(cin,w1);
        getline(cin,w2);
        for(int j=0;j<arr.size();j++)
        {
            if(arr[j]==w1)
            {
                arr[j] = w2;
            }
        }

        for(string ss:arr)
        {
            cout<<ss<<" ";
        }
        cout<<endl;
    }
    return 0;
}