text: class Solution {
  public:
      bool isAnagram(string s, string t) {
          vector<int> v(26);
          for (auto& x : s) ++v[x - 'a'];
          for (auto& x : t) --v[x - 'a'];
          return !any_of(begin(v), end(v), [](int x) { return x != 0; });
      }
  };