题目链接如下：

Online Judge

代码如下：

#include <iostream>
#include <string>
#include <vector>
#include <set>
// #define debugint main(){#ifdef debugfreopen("0.txt", "r", stdin);freopen("1.txt", "w", stdout);#endifstd::string word;std::vector<std::string> vec;std::set<std::string> st;while (std::cin >> word){vec.push_back(word);st.insert(word);}for (int i = 0; i < vec.size(); ++i){for (int j = 1; j < vec[i].size(); ++j){if(st.count(vec[i].substr(0, j)) && st.count(vec[i].substr(j))){std::cout << vec[i] << std::endl;break;}}}#ifdef debugfclose(stdin);fclose(stdout);#endifreturn 0;
}