mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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168 lines
17 KiB
JSON
168 lines
17 KiB
JSON
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"title": "Finding the Users Active Minutes",
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"content": "<p>You are given the logs for users' actions on LeetCode, and an integer <code>k</code>. The logs are represented by a 2D integer array <code>logs</code> where each <code>logs[i] = [ID<sub>i</sub>, time<sub>i</sub>]</code> indicates that the user with <code>ID<sub>i</sub></code> performed an action at the minute <code>time<sub>i</sub></code>.</p>\n\n<p><strong>Multiple users</strong> can perform actions simultaneously, and a single user can perform <strong>multiple actions</strong> in the same minute.</p>\n\n<p>The <strong>user active minutes (UAM)</strong> for a given user is defined as the <strong>number of unique minutes</strong> in which the user performed an action on LeetCode. A minute can only be counted once, even if multiple actions occur during it.</p>\n\n<p>You are to calculate a <strong>1-indexed</strong> array <code>answer</code> of size <code>k</code> such that, for each <code>j</code> (<code>1 <= j <= k</code>), <code>answer[j]</code> is the <strong>number of users</strong> whose <strong>UAM</strong> equals <code>j</code>.</p>\n\n<p>Return <i>the array </i><code>answer</code><i> as described above</i>.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> logs = [[0,5],[1,2],[0,2],[0,5],[1,3]], k = 5\n<strong>Output:</strong> [0,2,0,0,0]\n<strong>Explanation:</strong>\nThe user with ID=0 performed actions at minutes 5, 2, and 5 again. Hence, they have a UAM of 2 (minute 5 is only counted once).\nThe user with ID=1 performed actions at minutes 2 and 3. Hence, they have a UAM of 2.\nSince both users have a UAM of 2, answer[2] is 2, and the remaining answer[j] values are 0.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> logs = [[1,1],[2,2],[2,3]], k = 4\n<strong>Output:</strong> [1,1,0,0]\n<strong>Explanation:</strong>\nThe user with ID=1 performed a single action at minute 1. Hence, they have a UAM of 1.\nThe user with ID=2 performed actions at minutes 2 and 3. Hence, they have a UAM of 2.\nThere is one user with a UAM of 1 and one with a UAM of 2.\nHence, answer[1] = 1, answer[2] = 1, and the remaining values are 0.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= logs.length <= 10<sup>4</sup></code></li>\n\t<li><code>0 <= ID<sub>i</sub> <= 10<sup>9</sup></code></li>\n\t<li><code>1 <= time<sub>i</sub> <= 10<sup>5</sup></code></li>\n\t<li><code>k</code> is in the range <code>[The maximum <strong>UAM</strong> for a user, 10<sup>5</sup>]</code>.</li>\n</ul>\n",
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"Try to find the number of different minutes when action happened for each user.",
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"For each user increase the value of the answer array index which matches the UAM for this user."
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