mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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176 lines
20 KiB
JSON
176 lines
20 KiB
JSON
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"title": "Maximum Points After Enemy Battles",
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"content": "<p>You are given an integer array <code>enemyEnergies</code> denoting the energy values of various enemies.</p>\n\n<p>You are also given an integer <code>currentEnergy</code> denoting the amount of energy you have initially.</p>\n\n<p>You start with 0 points, and all the enemies are unmarked initially.</p>\n\n<p>You can perform <strong>either</strong> of the following operations <strong>zero </strong>or multiple times to gain points:</p>\n\n<ul>\n\t<li>Choose an <strong>unmarked</strong> enemy, <code>i</code>, such that <code>currentEnergy >= enemyEnergies[i]</code>. By choosing this option:\n\n\t<ul>\n\t\t<li>You gain 1 point.</li>\n\t\t<li>Your energy is reduced by the enemy's energy, i.e. <code>currentEnergy = currentEnergy - enemyEnergies[i]</code>.</li>\n\t</ul>\n\t</li>\n\t<li>If you have <strong>at least</strong> 1 point, you can choose an <strong>unmarked</strong> enemy, <code>i</code>. By choosing this option:\n\t<ul>\n\t\t<li>Your energy increases by the enemy's energy, i.e. <code>currentEnergy = currentEnergy + enemyEnergies[i]</code>.</li>\n\t\t<li>The <font face=\"monospace\">e</font>nemy <code>i</code> is <strong>marked</strong>.</li>\n\t</ul>\n\t</li>\n</ul>\n\n<p>Return an integer denoting the <strong>maximum</strong> points you can get in the end by optimally performing operations.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">enemyEnergies = [3,2,2], currentEnergy = 2</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">3</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>The following operations can be performed to get 3 points, which is the maximum:</p>\n\n<ul>\n\t<li>First operation on enemy 1: <code>points</code> increases by 1, and <code>currentEnergy</code> decreases by 2. So, <code>points = 1</code>, and <code>currentEnergy = 0</code>.</li>\n\t<li>Second operation on enemy 0: <code>currentEnergy</code> increases by 3, and enemy 0 is marked. So, <code>points = 1</code>, <code>currentEnergy = 3</code>, and marked enemies = <code>[0]</code>.</li>\n\t<li>First operation on enemy 2: <code>points</code> increases by 1, and <code>currentEnergy</code> decreases by 2. So, <code>points = 2</code>, <code>currentEnergy = 1</code>, and marked enemies = <code>[0]</code>.</li>\n\t<li>Second operation on enemy 2: <code>currentEnergy</code> increases by 2, and enemy 2 is marked. So, <code>points = 2</code>, <code>currentEnergy = 3</code>, and marked enemies = <code>[0, 2]</code>.</li>\n\t<li>First operation on enemy 1: <code>points</code> increases by 1, and <code>currentEnergy</code> decreases by 2. So, <code>points = 3</code>, <code>currentEnergy = 1</code>, and marked enemies = <code>[0, 2]</code>.</li>\n</ul>\n</div>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">enemyEnergies = </span>[2]<span class=\"example-io\">, currentEnergy = 10</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">5</span></p>\n\n<p><strong>Explanation: </strong></p>\n\n<p>Performing the first operation 5 times on enemy 0 results in the maximum number of points.</p>\n</div>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= enemyEnergies.length <= 10<sup>5</sup></code></li>\n\t<li><code>1 <= enemyEnergies[i] <= 10<sup>9</sup></code></li>\n\t<li><code>0 <= currentEnergy <= 10<sup>9</sup></code></li>\n</ul>\n",
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"The problem can be solved greedily.",
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"Mark all the others except the smallest one first.",
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"Use the smallest one to increase the energy.",
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"Note that the initial energy should be no less than the smallest enemy."
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