720. Longest Word in Dictionary

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【扫一扫了解最新限行尾号】
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static int wing=[]()
{
std::ios::sync_with_stdio(false);
cin.tie(NULL);
return ;
}(); class Solution
{
public:
string longestWord(vector<string>& words)
{
unordered_set<string> siset(words.begin(),words.end());
string res;
for(string s:words)
{
if(s.length()>res.length()||(s.length()==res.length()&&s<res))
{
if(judgein(siset,s))
res=s;
}
else
continue;
}
return res;
} bool judgein(unordered_set<string> &siset,string s)
{
while(!s.empty())
{
if(siset.find(s)!=siset.end())
s.pop_back();
else
return false;
}
return true;
}
};