# [Solution] Design an ATM Machine solution leetcode

## [Solution] Design an ATM Machine solution leetcode

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Design an ATM Machine solution leetcode – There is an ATM machine that stores banknotes of `5` denominations: `20``50``100``200`, and `500` dollars. Initially the ATM is empty. The user can use the machine to deposit or withdraw any amount of money.

When withdrawing, the machine prioritizes using banknotes of larger values.

• For example, if you want to withdraw `\$300` and there are `2` `\$50` banknotes, `1` `\$100` banknote, and `1` `\$200` banknote, then the machine will use the `\$100` and `\$200` banknotes.
• However, if you try to withdraw `\$600` and there are `3` `\$200` banknotes and `1` `\$500` banknote, then the withdraw request will be rejected because the machine will first try to use the `\$500` banknote and then be unable to use banknotes to complete the remaining `\$100`. Note that the machine is not allowed to use the `\$200` banknotes instead of the `\$500` banknote.

## [Solution] Design an ATM Machine solution leetcode

Implement the ATM class:

• `ATM()` Initializes the ATM object.
• `void deposit(int[] banknotesCount)` Deposits new banknotes in the order `\$20``\$50``\$100``\$200`, and `\$500`.
• `int[] withdraw(int amount)` Returns an array of length `5` of the number of banknotes that will be handed to the user in the order `\$20``\$50``\$100``\$200`, and `\$500`, and update the number of banknotes in the ATM after withdrawing. Returns `[-1]` if it is not possible (do not withdraw any banknotes in this case).

### Example 1: [Solution] Design an ATM Machine solution leetcode

```Input
["ATM", "deposit", "withdraw", "deposit", "withdraw", "withdraw"]
[[], [[0,0,1,2,1]], [600], [[0,1,0,1,1]], [600], [550]]
Output
[null, null, [0,0,1,0,1], null, [-1], [0,1,0,0,1]]

Explanation
ATM atm = new ATM();
atm.deposit([0,0,1,2,1]); // Deposits 1 \$100 banknote, 2 \$200 banknotes,
// and 1 \$500 banknote.
atm.withdraw(600);        // Returns [0,0,1,0,1]. The machine uses 1 \$100 banknote
// and 1 \$500 banknote. The banknotes left over in the
// machine are [0,0,0,2,0].
atm.deposit([0,1,0,1,1]); // Deposits 1 \$50, \$200, and \$500 banknote.
// The banknotes in the machine are now [0,1,0,3,1].
atm.withdraw(600);        // Returns [-1]. The machine will try to use a \$500 banknote
// and then be unable to complete the remaining \$100,
// so the withdraw request will be rejected.
// Since the request is rejected, the number of banknotes
// in the machine is not modified.
atm.withdraw(550);        // Returns [0,1,0,0,1]. The machine uses 1 \$50 banknote
// and 1 \$500 banknote.```

## Constraints: [Solution] Design an ATM Machine solution leetcode

• `banknotesCount.length == 5`
• `0 <= banknotesCount[i] <= 109`
• `1 <= amount <= 109`
• At most `5000` calls in total will be made to `withdraw` and `deposit`.
• At least one call will be made to each function `withdraw` and `deposit`.