class Solution { public: vectoruncommonFromSentences(string s1, string s2) { unordered_map mp; vector ans; string s; stringstream a,b; a< >s)mp[s]++; while(b>>s)mp[s]++; for(auto m:mp){ if(m.second==1){ ans.push_back(m.first); } } return ans; } };
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