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class Solution {
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 public:
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  bool strongPasswordCheckerII(string password) {
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    if (password.size() < 8) // 8 char length
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      return false;
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    bool lower = 0, upper = 0;
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    bool digit = 0, special = 0;
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    for (int i = 0; i < password.size(); i++) {    // check rest conditions
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      if (i > 0 && password[i] == password[i - 1]) // check duplicate
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        return false;
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      if (password[i] >= 65 && password[i] <= 90)
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        upper = 1; // uppercase
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      else if (password[i] >= 97 && password[i] <= 122)
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        lower = 1; // lowercase
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      else if (password[i] >= 48 && password[i] <= 57)
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        digit = 1; // digit
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      else         // special char
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        special = 1;
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    }
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    if (upper && lower && digit && special) return true;
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    return false;
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  }
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};