mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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177 lines
16 KiB
JSON
177 lines
16 KiB
JSON
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"title": "Minimum Cost to Merge Stones",
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"content": "<p>There are <code>n</code> piles of <code>stones</code> arranged in a row. The <code>i<sup>th</sup></code> pile has <code>stones[i]</code> stones.</p>\n\n<p>A move consists of merging exactly <code>k</code> <strong>consecutive</strong> piles into one pile, and the cost of this move is equal to the total number of stones in these <code>k</code> piles.</p>\n\n<p>Return <em>the minimum cost to merge all piles of stones into one pile</em>. If it is impossible, return <code>-1</code>.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> stones = [3,2,4,1], k = 2\n<strong>Output:</strong> 20\n<strong>Explanation:</strong> We start with [3, 2, 4, 1].\nWe merge [3, 2] for a cost of 5, and we are left with [5, 4, 1].\nWe merge [4, 1] for a cost of 5, and we are left with [5, 5].\nWe merge [5, 5] for a cost of 10, and we are left with [10].\nThe total cost was 20, and this is the minimum possible.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> stones = [3,2,4,1], k = 3\n<strong>Output:</strong> -1\n<strong>Explanation:</strong> After any merge operation, there are 2 piles left, and we can't merge anymore. So the task is impossible.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> stones = [3,5,1,2,6], k = 3\n<strong>Output:</strong> 25\n<strong>Explanation:</strong> We start with [3, 5, 1, 2, 6].\nWe merge [5, 1, 2] for a cost of 8, and we are left with [3, 8, 6].\nWe merge [3, 8, 6] for a cost of 17, and we are left with [17].\nThe total cost was 25, and this is the minimum possible.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>n == stones.length</code></li>\n\t<li><code>1 <= n <= 30</code></li>\n\t<li><code>1 <= stones[i] <= 100</code></li>\n\t<li><code>2 <= k <= 30</code></li>\n</ul>\n",
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