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| // @Title: 柠檬水找零 (Lemonade Change)
// @Author: 15816537946@163.com
// @Date: 2020-12-10 23:53:00
// @Runtime: 16 ms
// @Memory: 5.9 MB
func lemonadeChange(bills []int) bool {
five, ten := 0, 0
for _, bill := range bills {
if bill == 5 {
five++
} else if bill == 10 {
if five == 0 {
return false
}
five--
ten++
} else {
// 如果是20, 其实相当于没用的, 不能找零
if five > 0 && ten > 0 {
five--
ten--
} else if five >= 3 {
five -= 3
} else {
return false
}
}
}
return true
}
|