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111 lines
3.3 KiB
Markdown
111 lines
3.3 KiB
Markdown
---
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id: 691f7773cddba1caf1bf5ecd
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title: "Challenge 134: Traveling Shopper"
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challengeType: 29
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dashedName: challenge-134
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---
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# --description--
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Given an amount of money you have, and an array of items you want to buy, determine how many of them you can afford.
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- The given amount will be in the format `["Amount", "Currency Code"]`. For example: `["150.00", "USD"]` or `["6000", "JPY"]`.
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- Each array item you want to purchase will be in the same format.
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Use the following exchange rates to convert values:
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|Currency|1 Unit Equals|
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|USD|1.00 USD|
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|EUR|1.10 USD|
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|GBP|1.25 USD|
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|JPY|0.0070 USD|
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|CAD|0.75 USD|
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- If you can afford all the items in the list, return `"Buy them all!"`.
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- Otherwise, return `"Buy the first X items."`, where `X` is the number of items you can afford when purchased in the order given.
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# --hints--
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`buy_items(["150.00", "USD"], [["50.00", "USD"], ["75.00", "USD"], ["30.00", "USD"]])` should return `"Buy the first 2 items."`.
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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(buy_items(["150.00", "USD"], [["50.00", "USD"], ["75.00", "USD"], ["30.00", "USD"]]), "Buy the first 2 items.")`)
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}})
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```
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`buy_items(["200.00", "EUR"], [["50.00", "USD"], ["50.00", "USD"]])` should return `"Buy them all!"`.
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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(buy_items(["200.00", "EUR"], [["50.00", "USD"], ["50.00", "USD"]]), "Buy them all!")`)
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}})
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```
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`buy_items(["100.00", "CAD"], [["20.00", "USD"], ["15.00", "EUR"], ["10.00", "GBP"], ["6000", "JPY"], ["5.00", "CAD"], ["10.00", "USD"]])` should return `"Buy the first 3 items."`.
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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(buy_items(["100.00", "CAD"], [["20.00", "USD"], ["15.00", "EUR"], ["10.00", "GBP"], ["6000", "JPY"], ["5.00", "CAD"], ["10.00", "USD"]]), "Buy the first 3 items.")`)
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}})
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```
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`buy_items(["5000", "JPY"], [["3.00", "USD"], ["1000", "JPY"], ["5.00", "CAD"], ["2.00", "EUR"], ["4.00", "USD"], ["2000", "JPY"]])` should return `"Buy them all!"`.
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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(buy_items(["5000", "JPY"], [["3.00", "USD"], ["1000", "JPY"], ["5.00", "CAD"], ["2.00", "EUR"], ["4.00", "USD"], ["2000", "JPY"]]), "Buy them all!")`)
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}})
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```
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`buy_items(["200.00", "USD"], [["50.00", "USD"], ["40.00", "EUR"], ["30.00", "GBP"], ["5000", "JPY"], ["25.00", "CAD"], ["20.00", "USD"]])` should return `"Buy the first 5 items."`.
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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(buy_items(["200.00", "USD"], [["50.00", "USD"], ["40.00", "EUR"], ["30.00", "GBP"], ["5000", "JPY"], ["25.00", "CAD"], ["20.00", "USD"]]), "Buy the first 5 items.")`)
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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 buy_items(funds, items):
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return funds
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```
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# --solutions--
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```py
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def buy_items(funds, items):
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rates = {
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"USD": 1.00,
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"EUR": 1.10,
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"GBP": 1.25,
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"JPY": 0.0070,
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"CAD": 0.75
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}
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amount, currency = funds
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money = float(amount) * rates[currency]
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for i, (item_amount, item_currency) in enumerate(items):
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item_cost_usd = float(item_amount) * rates[item_currency]
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if item_cost_usd > money:
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return f"Buy the first {i} items."
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money -= item_cost_usd
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return "Buy them all!"
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```
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