mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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161 lines
18 KiB
JSON
161 lines
18 KiB
JSON
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"title": "Find All Possible Stable Binary Arrays I",
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"content": "<p>You are given 3 positive integers <code>zero</code>, <code>one</code>, and <code>limit</code>.</p>\n\n<p>A <span data-keyword=\"binary-array\">binary array</span> <code>arr</code> is called <strong>stable</strong> if:</p>\n\n<ul>\n\t<li>The number of occurrences of 0 in <code>arr</code> is <strong>exactly </strong><code>zero</code>.</li>\n\t<li>The number of occurrences of 1 in <code>arr</code> is <strong>exactly</strong> <code>one</code>.</li>\n\t<li>Each <span data-keyword=\"subarray-nonempty\">subarray</span> of <code>arr</code> with a size greater than <code>limit</code> must contain <strong>both </strong>0 and 1.</li>\n</ul>\n\n<p>Return the <em>total</em> number of <strong>stable</strong> binary arrays.</p>\n\n<p>Since the answer may be very large, return it <strong>modulo</strong> <code>10<sup>9</sup> + 7</code>.</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\">zero = 1, one = 1, limit = 2</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">2</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>The two possible stable binary arrays are <code>[1,0]</code> and <code>[0,1]</code>, as both arrays have a single 0 and a single 1, and no subarray has a length greater than 2.</p>\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\">zero = 1, one = 2, limit = 1</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">1</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>The only possible stable binary array is <code>[1,0,1]</code>.</p>\n\n<p>Note that the binary arrays <code>[1,1,0]</code> and <code>[0,1,1]</code> have subarrays of length 2 with identical elements, hence, they are not stable.</p>\n</div>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<div class=\"example-block\">\n<p><strong>Input:</strong> <span class=\"example-io\">zero = 3, one = 3, limit = 2</span></p>\n\n<p><strong>Output:</strong> <span class=\"example-io\">14</span></p>\n\n<p><strong>Explanation:</strong></p>\n\n<p>All the possible stable binary arrays are <code>[0,0,1,0,1,1]</code>, <code>[0,0,1,1,0,1]</code>, <code>[0,1,0,0,1,1]</code>, <code>[0,1,0,1,0,1]</code>, <code>[0,1,0,1,1,0]</code>, <code>[0,1,1,0,0,1]</code>, <code>[0,1,1,0,1,0]</code>, <code>[1,0,0,1,0,1]</code>, <code>[1,0,0,1,1,0]</code>, <code>[1,0,1,0,0,1]</code>, <code>[1,0,1,0,1,0]</code>, <code>[1,0,1,1,0,0]</code>, <code>[1,1,0,0,1,0]</code>, and <code>[1,1,0,1,0,0]</code>.</p>\n</div>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= zero, one, limit <= 200</code></li>\n</ul>\n",
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"Let <code>dp[a][b][c = 0/1][d]</code> be the number of stable arrays with exactly <code>a</code> 0s, <code>b</code> 1s and consecutive <code>d</code> value of <code>c</code>’s at the end.",
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"Try each case by appending a 0/1 at last to get the inductions."
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