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82 lines
1.8 KiB
Markdown
82 lines
1.8 KiB
Markdown
---
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id: 6a22d77ddf034bc4e35b1d54
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title: "Challenge 347: Game Theory"
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challengeType: 28
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dashedName: challenge-347
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---
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# --description--
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Given two equal length strings representing two players' strategies for a game, return the scores as an array `[player1, player2]`.
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- The given strings will only contain one of two letters: `"C"` (cooperate) or `"D"` (defect).
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- Each character represents one round, scored as follows:
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- If both players cooperate, each scores 3.
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- If both players defect, each scores 1.
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- If one player defects and the other cooperates, the defector scores 5 and the cooperator scores 0.
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# --hints--
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`playGame("CCCC", "CCCC")` should return `[12, 12]`.
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```js
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assert.deepEqual(playGame("CCCC", "CCCC"), [12, 12]);
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```
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`playGame("DDDD", "DDDD")` should return `[4, 4]`.
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```js
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assert.deepEqual(playGame("DDDD", "DDDD"), [4, 4]);
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```
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`playGame("CCDD", "CDDD")` should return `[5, 10]`.
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```js
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assert.deepEqual(playGame("CCDD", "CDDD"), [5, 10]);
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```
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`playGame("CCCDCDCCCDDC", "CCDDCDCDDCCD")` should return `[24, 34]`.
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```js
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assert.deepEqual(playGame("CCCDCDCCCDDC", "CCDDCDCDDCCD"), [24, 34]);
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```
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`playGame("DDCCDDDDCDDCDDDCDD", "CCDCCCDCCCDCCCCDCC")` should return `[66, 21]`.
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```js
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assert.deepEqual(playGame("DDCCDDDDCDDCDDDCDD", "CCDCCCDCCCDCCCCDCC"), [66, 21]);
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```
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# --seed--
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## --seed-contents--
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```js
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function playGame(p1, p2) {
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return p1;
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}
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```
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# --solutions--
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```js
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function playGame(p1, p2) {
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let scores = [0, 0];
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for (let i = 0; i < p1.length; i++) {
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if (p1[i] === 'C' && p2[i] === 'C') {
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scores[0] += 3; scores[1] += 3;
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} else if (p1[i] === 'D' && p2[i] === 'D') {
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scores[0] += 1; scores[1] += 1;
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} else if (p1[i] === 'D' && p2[i] === 'C') {
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scores[0] += 5; scores[1] += 0;
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} else {
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scores[0] += 0; scores[1] += 5;
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}
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}
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return scores;
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}
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```
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