https://cubegao.com/tags/%E5%AD%97%E7%AC%A6%E4%B8%B2%E6%93%8D%E4%BD%9C/ Recent content in 字符串操作 on cubegao Hugo zh-CN Wed, 15 Apr 2015 19:32:00 +0800 https://cubegao.com/post/2015-04-15-replace-spaces/ Wed, 15 Apr 2015 19:32:00 +0800 https://cubegao.com/post/2015-04-15-replace-spaces/ <blockquote> <p>题目：请实现一个函数，把字符串中的每个空格替换成&quot;%20&quot;。例如输入&quot;We are happy.&quot;，则输出&quot;We%20are%20happy.&quot;。</p></blockquote> <div class="goat svg-container "> <svg xmlns="http://www.w3.org/2000/svg" font-family="Menlo,Lucida Console,monospace" viewBox="0 0 512 569" > <g transform='translate(8,16)'> <path d='M 240,16 L 248,16' fill='none' stroke='currentColor'></path> <polygon points='256.000000,16.000000 244.000000,10.400000 244.000000,21.600000' fill='currentColor' transform='rotate(0.000000, 248.000000, 16.000000)'></polygon> <circle cx='288' cy='224' r='6' stroke='currentColor' fill='currentColor'></circle> <text text-anchor='middle' x='0' y='4' fill='currentColor' 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style='font-size:1em'>e</text> <text text-anchor='middle' x='488' y='244' fill='currentColor' style='font-size:1em'>n</text> <text text-anchor='middle' x='496' y='244' fill='currentColor' style='font-size:1em'>)</text> </g> </svg> </div> <p>解题思路：如果从前往后处理，则空格后面所有的字符都后移若干位。所以从后向前处理会有更优解。这里直接新建了一个数组模拟操作的。</p>