Check Whether Two Strings are Almost Equivalent LeetCode solution in C++

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class Solution {
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 public:
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  bool checkAlmostEquivalent(string word1, string word2) {
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    unordered_map<char, int> m;
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    for (int i = 0; i < word1.size(); i++) {
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      m[word1[i]]++;
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    }
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    for (int i = 0; i < word2.size(); i++) {
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      m[word2[i]]--;
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    }
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    for (auto i : m) {
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      if (abs(i.second) > 3) {
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        return false;
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      }
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    }
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    return true;
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  }
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};