题解 | 单词替换

#include <iostream>
#include <string>
#include <vector>
using namespace std;
int main() {
    string str,s,r;
    vector<string> a;
    getline(cin,str);
    getline(cin,s);
    getline(cin,r);
    string temp;
    for (int i = 0; i < str.size(); ++i) {
        if (str[i]!=' ') temp+=str[i];
        else {
            a.push_back(temp);
            temp.clear();
        }
    }
    a.push_back(temp);
    for (int i = 0; i < a.size(); ++i) {
        if (a[i]==s) a[i]=r;
    }
    for (int i = 0; i < a.size(); ++i) {
        cout<<a[i]<<' ';
    }
    return 0;
}