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| class Solution {
public:
bool lemonadeChange(vector<int>& bills) {\
int five = 0, ten = 0;
for (int bill : bills) {
if (bill == 5) {
++five;
} else if (bill == 10) {
if (--five < 0) return false;
++ten;
} else {
if (five > 0 && ten > 0) {
--five;
--ten;
} else if (five >= 3) {
five -= 3;
} else {
return false;
}
}
}
return true;
}
};
|