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leetcode-problemset/leetcode/originData/magnetic-force-between-two-balls.json
2022-05-02 23:44:12 +08:00

175 lines
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JSON

{
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"title": "Magnetic Force Between Two Balls",
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"content": "<p>In the universe Earth C-137, Rick discovered a special form of magnetic force between two balls if they are put in his new invented basket. Rick has <code>n</code> empty baskets, the <code>i<sup>th</sup></code> basket is at <code>position[i]</code>, Morty has <code>m</code> balls and needs to distribute the balls into the baskets such that the <strong>minimum magnetic force</strong> between any two balls is <strong>maximum</strong>.</p>\n\n<p>Rick stated that magnetic force between two different balls at positions <code>x</code> and <code>y</code> is <code>|x - y|</code>.</p>\n\n<p>Given the integer array <code>position</code> and the integer <code>m</code>. Return <em>the required force</em>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/08/11/q3v1.jpg\" style=\"width: 562px; height: 195px;\" />\n<pre>\n<strong>Input:</strong> position = [1,2,3,4,7], m = 3\n<strong>Output:</strong> 3\n<strong>Explanation:</strong> Distributing the 3 balls into baskets 1, 4 and 7 will make the magnetic force between ball pairs [3, 3, 6]. The minimum magnetic force is 3. We cannot achieve a larger minimum magnetic force than 3.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> position = [5,4,3,2,1,1000000000], m = 2\n<strong>Output:</strong> 999999999\n<strong>Explanation:</strong> We can use baskets 1 and 1000000000.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>n == position.length</code></li>\n\t<li><code>2 &lt;= n &lt;= 10<sup>5</sup></code></li>\n\t<li><code>1 &lt;= position[i] &lt;= 10<sup>9</sup></code></li>\n\t<li>All integers in <code>position</code> are <strong>distinct</strong>.</li>\n\t<li><code>2 &lt;= m &lt;= position.length</code></li>\n</ul>\n",
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"If you can place balls such that the answer is x then you can do it for y where y < x.",
"Similarly if you cannot place balls such that the answer is x then you can do it for y where y > x.",
"Binary search on the answer and greedily see if it is possible."
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