860. Lemonade Change
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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