mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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175 lines
17 KiB
JSON
175 lines
17 KiB
JSON
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"title": "Adding Spaces to a String",
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"content": "<p>You are given a <strong>0-indexed</strong> string <code>s</code> and a <strong>0-indexed</strong> integer array <code>spaces</code> that describes the indices in the original string where spaces will be added. Each space should be inserted <strong>before</strong> the character at the given index.</p>\n\n<ul>\n\t<li>For example, given <code>s = "EnjoyYourCoffee"</code> and <code>spaces = [5, 9]</code>, we place spaces before <code>'Y'</code> and <code>'C'</code>, which are at indices <code>5</code> and <code>9</code> respectively. Thus, we obtain <code>"Enjoy <strong><u>Y</u></strong>our <u><strong>C</strong></u>offee"</code>.</li>\n</ul>\n\n<p>Return<strong> </strong><em>the modified string <strong>after</strong> the spaces have been added.</em></p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "LeetcodeHelpsMeLearn", spaces = [8,13,15]\n<strong>Output:</strong> "Leetcode Helps Me Learn"\n<strong>Explanation:</strong> \nThe indices 8, 13, and 15 correspond to the underlined characters in "Leetcode<u><strong>H</strong></u>elps<u><strong>M</strong></u>e<u><strong>L</strong></u>earn".\nWe then place spaces before those characters.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "icodeinpython", spaces = [1,5,7,9]\n<strong>Output:</strong> "i code in py thon"\n<strong>Explanation:</strong>\nThe indices 1, 5, 7, and 9 correspond to the underlined characters in "i<u><strong>c</strong></u>ode<u><strong>i</strong></u>n<u><strong>p</strong></u>y<u><strong>t</strong></u>hon".\nWe then place spaces before those characters.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> s = "spacing", spaces = [0,1,2,3,4,5,6]\n<strong>Output:</strong> " s p a c i n g"\n<strong>Explanation:</strong>\nWe are also able to place spaces before the first character of the string.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= s.length <= 3 * 10<sup>5</sup></code></li>\n\t<li><code>s</code> consists only of lowercase and uppercase English letters.</li>\n\t<li><code>1 <= spaces.length <= 3 * 10<sup>5</sup></code></li>\n\t<li><code>0 <= spaces[i] <= s.length - 1</code></li>\n\t<li>All the values of <code>spaces</code> are <strong>strictly increasing</strong>.</li>\n</ul>\n",
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"code": "-spec add_spaces(S :: unicode:unicode_binary(), Spaces :: [integer()]) -> unicode:unicode_binary().\nadd_spaces(S, Spaces) ->\n .",
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"Create a new string, initially empty, as the modified string. Iterate through the original string and append each character of the original string to the new string. However, each time you reach a character that requires a space before it, append a space before appending the character.",
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"Since the array of indices for the space locations is sorted, use a pointer to keep track of the next index to place a space. Only increment the pointer once a space has been appended.",
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"Ensure that your append operation can be done in O(1)."
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"sampleTestCase": "\"LeetcodeHelpsMeLearn\"\n[8,13,15]",
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