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79 lines
3.6 KiB
HTML
79 lines
3.6 KiB
HTML
<p>You are given an <strong>1-indexed</strong> integer array <code>prices</code> where <code>prices[i]</code> denotes the number of coins needed to purchase the <code>i<sup>th</sup></code> fruit.</p>
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<p>The fruit market has the following reward for each fruit:</p>
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<ul>
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<li>If you purchase the <code>i<sup>th</sup></code> fruit at <code>prices[i]</code> coins, you can get any number of the next <code>i</code> fruits for free.</li>
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</ul>
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<p><strong>Note</strong> that even if you <strong>can</strong> take fruit <code>j</code> for free, you can still purchase it for <code>prices[j]</code> coins to receive its reward.</p>
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<p>Return the <strong>minimum</strong> number of coins needed to acquire all the fruits.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<div class="example-block">
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<p><strong>Input:</strong> <span class="example-io">prices = [3,1,2]</span></p>
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<p><strong>Output:</strong> <span class="example-io">4</span></p>
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<p><strong>Explanation:</strong></p>
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<ul>
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<li>Purchase the 1<sup>st</sup> fruit with <code>prices[0] = 3</code> coins, you are allowed to take the 2<sup>nd</sup> fruit for free.</li>
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<li>Purchase the 2<sup>nd</sup> fruit with <code>prices[1] = 1</code> coin, you are allowed to take the 3<sup>rd</sup> fruit for free.</li>
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<li>Take the 3<sup>rd</sup> fruit for free.</li>
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</ul>
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<p>Note that even though you could take the 2<sup>nd</sup> fruit for free as a reward of buying 1<sup>st</sup> fruit, you purchase it to receive its reward, which is more optimal.</p>
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</div>
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<p><strong class="example">Example 2:</strong></p>
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<div class="example-block">
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<p><strong>Input:</strong> <span class="example-io">prices = [1,10,1,1]</span></p>
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<p><strong>Output:</strong> <span class="example-io">2</span></p>
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<p><strong>Explanation:</strong></p>
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<ul>
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<li>Purchase the 1<sup>st</sup> fruit with <code>prices[0] = 1</code> coin, you are allowed to take the 2<sup>nd</sup> fruit for free.</li>
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<li>Take the 2<sup>nd</sup> fruit for free.</li>
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<li>Purchase the 3<sup>rd</sup> fruit for <code>prices[2] = 1</code> coin, you are allowed to take the 4<sup>th</sup> fruit for free.</li>
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<li>Take the 4<sup>t</sup><sup>h</sup> fruit for free.</li>
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</ul>
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</div>
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<p><strong class="example">Example 3:</strong></p>
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<div class="example-block">
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<p><strong>Input:</strong> <span class="example-io">prices = [26,18,6,12,49,7,45,45]</span></p>
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<p><strong>Output:</strong> <span class="example-io">39</span></p>
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<p><strong>Explanation:</strong></p>
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<ul>
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<li>Purchase the 1<sup>st</sup> fruit with <code>prices[0] = 26</code> coin, you are allowed to take the 2<sup>nd</sup> fruit for free.</li>
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<li>Take the 2<sup>nd</sup> fruit for free.</li>
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<li>Purchase the 3<sup>rd</sup> fruit for <code>prices[2] = 6</code> coin, you are allowed to take the 4<sup>th</sup>, 5<sup>th</sup> and 6<sup>th</sup> (the next three) fruits for free.</li>
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<li>Take the 4<sup>t</sup><sup>h</sup> fruit for free.</li>
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<li>Take the 5<sup>t</sup><sup>h</sup> fruit for free.</li>
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<li>Purchase the 6<sup>th</sup> fruit with <code>prices[5] = 7</code> coin, you are allowed to take the 8<sup>th</sup> and 9<sup>th</sup> fruit for free.</li>
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<li>Take the 7<sup>t</sup><sup>h</sup> fruit for free.</li>
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<li>Take the 8<sup>t</sup><sup>h</sup> fruit for free.</li>
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</ul>
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<p>Note that even though you could take the 6<sup>th</sup> fruit for free as a reward of buying 3<sup>rd</sup> fruit, you purchase it to receive its reward, which is more optimal.</p>
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</div>
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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 <= prices.length <= 1000</code></li>
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<li><code>1 <= prices[i] <= 10<sup>5</sup></code></li>
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</ul>
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