zoj 1825 Compound Words

#include<algorithm>#include<iostream>#include<string.h>using namespace std;string word[120000];int main(){int i=0;while(cin>>word[i++]);for(int j=0;j<i;j++){for(int k=0;k<word[j].size();k++){if(binary_search(word,word+i,word[j].substr(0,k))) {if(binary_search(word,word+i,word[j].substr(k))) {cout<<word[j]<<endl;break;}}}}return 0;}