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52 lines
2.4 KiB
HTML
52 lines
2.4 KiB
HTML
<p>A shop is selling candies at a discount. For <strong>every two</strong> candies sold, the shop gives a <strong>third</strong> candy for <strong>free</strong>.</p>
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<p>The customer can choose <strong>any</strong> candy to take away for free as long as the cost of the chosen candy is less than or equal to the <strong>minimum</strong> cost of the two candies bought.</p>
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<ul>
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<li>For example, if there are <code>4</code> candies with costs <code>1</code>, <code>2</code>, <code>3</code>, and <code>4</code>, and the customer buys candies with costs <code>2</code> and <code>3</code>, they can take the candy with cost <code>1</code> for free, but not the candy with cost <code>4</code>.</li>
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</ul>
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<p>Given a <strong>0-indexed</strong> integer array <code>cost</code>, where <code>cost[i]</code> denotes the cost of the <code>i<sup>th</sup></code> candy, return <em>the <strong>minimum cost</strong> of buying <strong>all</strong> the candies</em>.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> cost = [1,2,3]
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<strong>Output:</strong> 5
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<strong>Explanation:</strong> We buy the candies with costs 2 and 3, and take the candy with cost 1 for free.
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The total cost of buying all candies is 2 + 3 = 5. This is the <strong>only</strong> way we can buy the candies.
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Note that we cannot buy candies with costs 1 and 3, and then take the candy with cost 2 for free.
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The cost of the free candy has to be less than or equal to the minimum cost of the purchased candies.
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</pre>
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<p><strong class="example">Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> cost = [6,5,7,9,2,2]
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<strong>Output:</strong> 23
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<strong>Explanation:</strong> The way in which we can get the minimum cost is described below:
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- Buy candies with costs 9 and 7
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- Take the candy with cost 6 for free
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- We buy candies with costs 5 and 2
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- Take the last remaining candy with cost 2 for free
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Hence, the minimum cost to buy all candies is 9 + 7 + 5 + 2 = 23.
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</pre>
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<p><strong class="example">Example 3:</strong></p>
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<pre>
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<strong>Input:</strong> cost = [5,5]
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<strong>Output:</strong> 10
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<strong>Explanation:</strong> Since there are only 2 candies, we buy both of them. There is not a third candy we can take for free.
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Hence, the minimum cost to buy all candies is 5 + 5 = 10.
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</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>1 <= cost.length <= 100</code></li>
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<li><code>1 <= cost[i] <= 100</code></li>
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</ul>
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