class Solution {
public:
bool isAnagram(string s, string t) {
unordered_map<char, int> m;
for (char & ss: s)
m[ss]++;
for (char & tt: t){
if (m.find(tt) == m.end()) return false;
else m[tt]--;
}
for (auto & it: m){
if (it.second != 0) return false;
}
return true;
}
};
One pass...
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