mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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172 lines
15 KiB
JSON
172 lines
15 KiB
JSON
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"title": "Decode String",
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"content": "<p>Given an encoded string, return its decoded string.</p>\n\n<p>The encoding rule is: <code>k[encoded_string]</code>, where the <code>encoded_string</code> inside the square brackets is being repeated exactly <code>k</code> times. Note that <code>k</code> is guaranteed to be a positive integer.</p>\n\n<p>You may assume that the input string is always valid; there are no extra white spaces, square brackets are well-formed, etc.</p>\n\n<p>Furthermore, you may assume that the original data does not contain any digits and that digits are only for those repeat numbers, <code>k</code>. For example, there will not be input like <code>3a</code> or <code>2[4]</code>.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "3[a]2[bc]"\n<strong>Output:</strong> "aaabcbc"\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "3[a2[c]]"\n<strong>Output:</strong> "accaccacc"\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "2[abc]3[cd]ef"\n<strong>Output:</strong> "abcabccdcdcdef"\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= s.length <= 30</code></li>\n\t<li><code>s</code> consists of lowercase English letters, digits, and square brackets <code>'[]'</code>.</li>\n\t<li><code>s</code> is guaranteed to be <strong>a valid</strong> input.</li>\n\t<li>All the integers in <code>s</code> are in the range <code>[1, 300]</code>.</li>\n</ul>\n",
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"lang": "Erlang",
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"code": "-spec decode_string(S :: unicode:unicode_binary()) -> unicode:unicode_binary().\ndecode_string(S) ->\n .",
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