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83 lines
3.2 KiB
Markdown
83 lines
3.2 KiB
Markdown
---
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id: 691b559495c5cb5a37b9b484
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title: "Challenge 124: Inventory Update"
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challengeType: 29
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dashedName: challenge-124
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---
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# --description--
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Given a 2D array representing the inventory of your store, and another 2D array representing a shipment you have received, return your updated inventory.
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- Each element in the arrays will have the format: `[quantity, "item"]`, where `quantity` is an integer and `"item"` is a string.
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- Update items in the inventory by adding the quantity of any matching items from the shipment.
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- If a received item does not exist in the current inventory, add it as a new entry to the end of the inventory.
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- Return inventory in the order it was given with new items at the end in the order they appear in the shipment.
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For example, given an inventory of `[[2, "apples"], [5, "bananas"]]` and a shipment of `[[1, "apples"], [3, "bananas"]]`, return `[[3, "apples"], [8, "bananas"]]`.
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# --hints--
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`update_inventory([[2, "apples"], [5, "bananas"]], [[1, "apples"], [3, "bananas"]])` should return `[[3, "apples"], [8, "bananas"]]`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(update_inventory([[2, "apples"], [5, "bananas"]], [[1, "apples"], [3, "bananas"]]), [[3, "apples"], [8, "bananas"]])`)
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}})
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```
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`update_inventory([[2, "apples"], [5, "bananas"]], [[1, "apples"], [3, "bananas"], [4, "oranges"]])` should return `[[3, "apples"], [8, "bananas"], [4, "oranges"]]`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(update_inventory([[2, "apples"], [5, "bananas"]], [[1, "apples"], [3, "bananas"], [4, "oranges"]]), [[3, "apples"], [8, "bananas"], [4, "oranges"]])`)
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}})
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```
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`update_inventory([], [[10, "apples"], [30, "bananas"], [20, "oranges"]])` should return `[[10, "apples"], [30, "bananas"], [20, "oranges"]]`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(update_inventory([], [[10, "apples"], [30, "bananas"], [20, "oranges"]]), [[10, "apples"], [30, "bananas"], [20, "oranges"]])`)
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}})
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```
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`update_inventory([[0, "Bowling Ball"], [0, "Dirty Socks"], [0, "Hair Pin"], [0, "Microphone"]], [[1, "Hair Pin"], [1, "Half-Eaten Apple"], [1, "Bowling Ball"], [1, "Toothpaste"]])` should return `[[1, "Bowling Ball"], [0, "Dirty Socks"], [1, "Hair Pin"], [0, "Microphone"], [1, "Half-Eaten Apple"], [1, "Toothpaste"]]`.
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```js
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({test: () => { runPython(`
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from unittest import TestCase
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TestCase().assertEqual(update_inventory([[0, "Bowling Ball"], [0, "Dirty Socks"], [0, "Hair Pin"], [0, "Microphone"]], [[1, "Hair Pin"], [1, "Half-Eaten Apple"], [1, "Bowling Ball"], [1, "Toothpaste"]]), [[1, "Bowling Ball"], [0, "Dirty Socks"], [1, "Hair Pin"], [0, "Microphone"], [1, "Half-Eaten Apple"], [1, "Toothpaste"]])`)
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}})
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```
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# --seed--
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## --seed-contents--
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```py
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def update_inventory(inventory, shipment):
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return inventory
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```
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# --solutions--
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```py
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def update_inventory(inventory, shipment):
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inventory_map = {item: i for i, (qty, item) in enumerate(inventory)}
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for qty, item in shipment:
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if item in inventory_map:
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index = inventory_map[item]
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inventory[index][0] += qty
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else:
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inventory.append([qty, item])
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inventory_map[item] = len(inventory) - 1
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return inventory
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```
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