mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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172 lines
17 KiB
JSON
172 lines
17 KiB
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"title": "Minimum Cost For Tickets",
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"content": "<p>You have planned some train traveling one year in advance. The days of the year in which you will travel are given as an integer array <code>days</code>. Each day is an integer from <code>1</code> to <code>365</code>.</p>\n\n<p>Train tickets are sold in <strong>three different ways</strong>:</p>\n\n<ul>\n\t<li>a <strong>1-day</strong> pass is sold for <code>costs[0]</code> dollars,</li>\n\t<li>a <strong>7-day</strong> pass is sold for <code>costs[1]</code> dollars, and</li>\n\t<li>a <strong>30-day</strong> pass is sold for <code>costs[2]</code> dollars.</li>\n</ul>\n\n<p>The passes allow that many days of consecutive travel.</p>\n\n<ul>\n\t<li>For example, if we get a <strong>7-day</strong> pass on day <code>2</code>, then we can travel for <code>7</code> days: <code>2</code>, <code>3</code>, <code>4</code>, <code>5</code>, <code>6</code>, <code>7</code>, and <code>8</code>.</li>\n</ul>\n\n<p>Return <em>the minimum number of dollars you need to travel every day in the given list of days</em>.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> days = [1,4,6,7,8,20], costs = [2,7,15]\n<strong>Output:</strong> 11\n<strong>Explanation:</strong> For example, here is one way to buy passes that lets you travel your travel plan:\nOn day 1, you bought a 1-day pass for costs[0] = $2, which covered day 1.\nOn day 3, you bought a 7-day pass for costs[1] = $7, which covered days 3, 4, ..., 9.\nOn day 20, you bought a 1-day pass for costs[0] = $2, which covered day 20.\nIn total, you spent $11 and covered all the days of your travel.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> days = [1,2,3,4,5,6,7,8,9,10,30,31], costs = [2,7,15]\n<strong>Output:</strong> 17\n<strong>Explanation:</strong> For example, here is one way to buy passes that lets you travel your travel plan:\nOn day 1, you bought a 30-day pass for costs[2] = $15 which covered days 1, 2, ..., 30.\nOn day 31, you bought a 1-day pass for costs[0] = $2 which covered day 31.\nIn total, you spent $17 and covered all the days of your travel.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= days.length <= 365</code></li>\n\t<li><code>1 <= days[i] <= 365</code></li>\n\t<li><code>days</code> is in strictly increasing order.</li>\n\t<li><code>costs.length == 3</code></li>\n\t<li><code>1 <= costs[i] <= 1000</code></li>\n</ul>\n",
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