message: Update find-and-replace-pattern.cpp
diff: @@ -18,15 +18,15 @@ private:
  unordered_map<char, char> lookup;
  unordered_set<char> char_set;
  for (int i = 0; i < word.length(); ++i) {
  - const auto& w = word[i], &p = pattern[i];
  - if (!lookup.count(w)) {
  + const auto& c = word[i], &p = pattern[i];
  + if (!lookup.count(c)) {
  if (char_set.count(p)) {
  return false;
  }
  char_set.emplace(p);
  - lookup[w] = p;
  + lookup[c] = p;
  }
  - if (lookup[w] != p) {
  + if (lookup[c] != p) {
  return false;
  }
  }
  