题解 | #单词替换#

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

int main() {

	string s;
	getline(cin, s);
	string sou;
	string des;
	cin >> sou >> des;
	//分割句子
	vector<string>v;
	int pos = 0;
	
	while (true) {
		string temp = s.substr(pos, s.find(' ', pos) - pos);
		//cout << temp << endl;
		v.push_back(temp);
		pos = s.find(' ', pos) + 1;
		if (pos == s.npos + 1)break;
	}
	
	for (int i = 0; i < v.size(); i++) {
		if (v[i] == sou) {
			v[i] = des;
		}
	}
	//cout << v.size() << endl;

	for (int i = 0; i < v.size(); i++) {
		cout << v[i] << " ";
	}
	cout << endl;

	return 0;
}