mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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183 lines
16 KiB
JSON
183 lines
16 KiB
JSON
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"title": "Minimum Changes To Make Alternating Binary String",
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"content": "<p>You are given a string <code>s</code> consisting only of the characters <code>'0'</code> and <code>'1'</code>. In one operation, you can change any <code>'0'</code> to <code>'1'</code> or vice versa.</p>\n\n<p>The string is called alternating if no two adjacent characters are equal. For example, the string <code>"010"</code> is alternating, while the string <code>"0100"</code> is not.</p>\n\n<p>Return <em>the <strong>minimum</strong> number of operations needed to make</em> <code>s</code> <em>alternating</em>.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "0100"\n<strong>Output:</strong> 1\n<strong>Explanation:</strong> If you change the last character to '1', s will be "0101", which is alternating.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "10"\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> s is already alternating.\n</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "1111"\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> You need two operations to reach "0101" or "1010".\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= s.length <= 10<sup>4</sup></code></li>\n\t<li><code>s[i]</code> is either <code>'0'</code> or <code>'1'</code>.</li>\n</ul>\n",
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"Think about how the final string will look like.",
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"It will either start with a '0' and be like '010101010..' or with a '1' and be like '10101010..'",
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"Try both ways, and check for each way, the number of changes needed to reach it from the given string. The answer is the minimum of both ways."
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