class Solution

 {

 public:

     bool lemonadeChange(vector<int>& bills)

     {

         int five = , ten = ;

         for (int i : bills)

         {

             if (i == ) five++;

             else if (i == ) five--, ten++;

             else if (ten > ) ten--, five--;

             else five -= ;

             if (five < ) return false;

         }

         return true;

     }

 };

扫描一遍，问题不大

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