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| class Solution {
public boolean lemonadeChange(int[] bills) {
int count5 = 0;
int count10 = 0;
for (int bill : bills) {
switch (bill) {
case 5:
count5++;
break;
case 10:
if (count5-- == 0) {
return false;
}
count10++;
break;
case 20:
if (count10 == 0) {
count5 -= 3;
} else {
count10--;
count5 -= 1;
}
if (count5 < 0) {
return false;
}
break;
default:
throw new IllegalArgumentException("Illegal bill: " + bill);
}
}
return true;
}
}
|