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148 lines
6.0 KiB
Markdown
148 lines
6.0 KiB
Markdown
---
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id: 697a49e9860d24853adef681
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title: "Challenge 196: 2026 Winter Games Day 17: Closing Day"
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challengeType: 29
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dashedName: challenge-196
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---
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# --description--
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Given a 2D array of medal winners, return a medal count for each country as a CSV string.
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- In the given array, each sub-array represents a single event: `[gold_winner, silver_winner, bronze_winner]`
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- The returned CSV string should have the following format, with the first line being headers:
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```sh
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Country,Gold,Silver,Bronze,Total
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country_name,gold_count,silver_count,bronze_count,total_medals
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```
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- Separate new lines with the new line character (`"\n"`).
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- Do not include spaces around commas or at the end of lines.
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- Sort the returned CSV by gold medal count, highest first. If two countries have the same gold medal count, sort the tied ones alphabetically.
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For example, given:
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```js
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[
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["USA", "CAN", "NOR"],
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["NOR", "USA", "CAN"],
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["USA", "NOR", "SWE"]
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]
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```
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Return:
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```sh
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"Country,Gold,Silver,Bronze,Total\nUSA,2,1,0,3\nNOR,1,1,1,3\nCAN,0,1,1,2\nSWE,0,0,1,1"
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```
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Which looks like this when printed:
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```sh
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Country,Gold,Silver,Bronze,Total
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USA,2,1,0,3
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NOR,1,1,1,3
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CAN,0,1,1,2
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SWE,0,0,1,1
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```
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# --hints--
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`count_medals([["USA", "CAN", "NOR"], ["NOR", "USA", "CAN"], ["USA", "NOR", "SWE"]])` should return `"Country,Gold,Silver,Bronze,Total\nUSA,2,1,0,3\nNOR,1,1,1,3\nCAN,0,1,1,2\nSWE,0,0,1,1"`.
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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(count_medals([["USA", "CAN", "NOR"], ["NOR", "USA", "CAN"], ["USA", "NOR", "SWE"]]), "Country,Gold,Silver,Bronze,Total\\nUSA,2,1,0,3\\nNOR,1,1,1,3\\nCAN,0,1,1,2\\nSWE,0,0,1,1")`)
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}})
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```
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`count_medals([["NOR","SWE","FIN"]])` should return `"Country,Gold,Silver,Bronze,Total\nNOR,1,0,0,1\nFIN,0,0,1,1\nSWE,0,1,0,1"`.
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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(count_medals([["NOR","SWE","FIN"]]), "Country,Gold,Silver,Bronze,Total\\nNOR,1,0,0,1\\nFIN,0,0,1,1\\nSWE,0,1,0,1")`)
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}})
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```
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`count_medals([["ITA", "CHN", "CHN"], ["JPN", "ITA", "JPN"]])` should return `"Country,Gold,Silver,Bronze,Total\nITA,1,1,0,2\nJPN,1,0,1,2\nCHN,0,1,1,2"`.
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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(count_medals([["ITA", "CHN", "CHN"], ["JPN", "ITA", "JPN"]]), "Country,Gold,Silver,Bronze,Total\\nITA,1,1,0,2\\nJPN,1,0,1,2\\nCHN,0,1,1,2")`)
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}})
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```
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`count_medals([["USA","CAN","NOR"], ["GER","FRA","ITA"], ["JPN","KOR","CHN"], ["SWE","FIN","NOR"], ["CAN","USA","SWE"], ["FRA","GER","ITA"]])` should return `"Country,Gold,Silver,Bronze,Total\nCAN,1,1,0,2\nFRA,1,1,0,2\nGER,1,1,0,2\nJPN,1,0,0,1\nSWE,1,0,1,2\nUSA,1,1,0,2\nCHN,0,0,1,1\nFIN,0,1,0,1\nITA,0,0,2,2\nKOR,0,1,0,1\nNOR,0,0,2,2"`.
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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(count_medals([["USA","CAN","NOR"], ["GER","FRA","ITA"], ["JPN","KOR","CHN"], ["SWE","FIN","NOR"], ["CAN","USA","SWE"], ["FRA","GER","ITA"]]), "Country,Gold,Silver,Bronze,Total\\nCAN,1,1,0,2\\nFRA,1,1,0,2\\nGER,1,1,0,2\\nJPN,1,0,0,1\\nSWE,1,0,1,2\\nUSA,1,1,0,2\\nCHN,0,0,1,1\\nFIN,0,1,0,1\\nITA,0,0,2,2\\nKOR,0,1,0,1\\nNOR,0,0,2,2")`)
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}})
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```
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`count_medals([["ESP","ITA","FRA"], ["ITA","ESP","GER"], ["NOR","SWE","FIN"], ["FIN","NOR","SWE"], ["USA","CAN","MEX"], ["CAN","USA","MEX"], ["JPN","KOR","CHN"], ["CHN","JPN","KOR"]])` should return `"Country,Gold,Silver,Bronze,Total\nCAN,1,1,0,2\nCHN,1,0,1,2\nESP,1,1,0,2\nFIN,1,0,1,2\nITA,1,1,0,2\nJPN,1,1,0,2\nNOR,1,1,0,2\nUSA,1,1,0,2\nFRA,0,0,1,1\nGER,0,0,1,1\nKOR,0,1,1,2\nMEX,0,0,2,2\nSWE,0,1,1,2"`.
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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(count_medals([["ESP","ITA","FRA"], ["ITA","ESP","GER"], ["NOR","SWE","FIN"], ["FIN","NOR","SWE"], ["USA","CAN","MEX"], ["CAN","USA","MEX"], ["JPN","KOR","CHN"], ["CHN","JPN","KOR"]]), "Country,Gold,Silver,Bronze,Total\\nCAN,1,1,0,2\\nCHN,1,0,1,2\\nESP,1,1,0,2\\nFIN,1,0,1,2\\nITA,1,1,0,2\\nJPN,1,1,0,2\\nNOR,1,1,0,2\\nUSA,1,1,0,2\\nFRA,0,0,1,1\\nGER,0,0,1,1\\nKOR,0,1,1,2\\nMEX,0,0,2,2\\nSWE,0,1,1,2")`)
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}})
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```
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`count_medals([["USA","CAN","GER"], ["NOR","SWE","FIN"], ["USA","NOR","SWE"], ["GER","FRA","ITA"], ["JPN","KOR","CHN"], ["USA","GER","CAN"], ["SWE","NOR","FIN"], ["CAN","USA","NOR"], ["FRA","GER","ITA"], ["JPN","CHN","KOR"], ["SWE","FIN","NOR"], ["GER","ITA","FRA"]])` should return `"Country,Gold,Silver,Bronze,Total\nUSA,3,1,0,4\nGER,2,2,1,5\nJPN,2,0,0,2\nSWE,2,1,1,4\nCAN,1,1,1,3\nFRA,1,1,1,3\nNOR,1,2,2,5\nCHN,0,1,1,2\nFIN,0,1,2,3\nITA,0,1,2,3\nKOR,0,1,1,2"`.
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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(count_medals([["USA","CAN","GER"], ["NOR","SWE","FIN"], ["USA","NOR","SWE"], ["GER","FRA","ITA"], ["JPN","KOR","CHN"], ["USA","GER","CAN"], ["SWE","NOR","FIN"], ["CAN","USA","NOR"], ["FRA","GER","ITA"], ["JPN","CHN","KOR"], ["SWE","FIN","NOR"], ["GER","ITA","FRA"]]), "Country,Gold,Silver,Bronze,Total\\nUSA,3,1,0,4\\nGER,2,2,1,5\\nJPN,2,0,0,2\\nSWE,2,1,1,4\\nCAN,1,1,1,3\\nFRA,1,1,1,3\\nNOR,1,2,2,5\\nCHN,0,1,1,2\\nFIN,0,1,2,3\\nITA,0,1,2,3\\nKOR,0,1,1,2")`)
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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 count_medals(winners):
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return winners
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```
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# --solutions--
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```py
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def count_medals(winners):
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counts = {}
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for gold, silver, bronze in winners:
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for country, medal_type in [(gold, "Gold"), (silver, "Silver"), (bronze, "Bronze")]:
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if country not in counts:
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counts[country] = {"Gold": 0, "Silver": 0, "Bronze": 0}
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counts[country][medal_type] += 1
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countries = [
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{
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"Country": country,
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"Gold": medals["Gold"],
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"Silver": medals["Silver"],
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"Bronze": medals["Bronze"],
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"Total": medals["Gold"] + medals["Silver"] + medals["Bronze"]
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}
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for country, medals in counts.items()
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]
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countries.sort(key=lambda c: (-c["Gold"], c["Country"]))
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lines = ["Country,Gold,Silver,Bronze,Total"]
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for c in countries:
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lines.append(f'{c["Country"]},{c["Gold"]},{c["Silver"]},{c["Bronze"]},{c["Total"]}')
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return "\n".join(lines)
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```
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