{ "question_id": 75, "question_title": "颜色分类", "difficulty": "中等", "question_content": "<p>给定一个包含红色、白色和蓝色，一共 <code>n</code><em> </em>个元素的数组，<strong><a href=\"https://baike.baidu.com/item/%E5%8E%9F%E5%9C%B0%E7%AE%97%E6%B3%95\" target=\"_blank\">原地</a></strong>对它们进行排序，使得相同颜色的元素相邻，并按照红色、白色、蓝色顺序排列。</p><p>此题中，我们使用整数 <code>0</code>、 <code>1</code> 和 <code>2</code> 分别表示红色、白色和蓝色。</p><ul></ul><p> </p><p><strong>示例 1：</strong></p><pre><strong>输入：</strong>nums = [2,0,2,1,1,0]<strong><br />输出：</strong>[0,0,1,1,2,2]</pre><p><strong>示例 2：</strong></p><pre><strong>输入：</strong>nums = [2,0,1]<strong><br />输出：</strong>[0,1,2]</pre><p><strong>示例 3：</strong></p><pre><strong>输入：</strong>nums = [0]<strong><br />输出：</strong>[0]</pre><p><strong>示例 4：</strong></p><pre><strong>输入：</strong>nums = [1]<strong><br />输出：</strong>[1]</pre><p> </p><p><strong>提示：</strong></p><ul>\t<li><code>n == nums.length</code></li>\t<li><code>1 <= n <= 300</code></li>\t<li><code>nums[i]</code> 为 <code>0</code>、<code>1</code> 或 <code>2</code></li></ul><p> </p><p><strong>进阶：</strong></p><ul>\t<li>你可以不使用代码库中的排序函数来解决这道题吗？</li>\t<li>你能想出一个仅使用常数空间的一趟扫描算法吗？</li></ul>", "topic_link": "https://bbs.csdn.net/topics/600470126", "cpp": "#include <bits/stdc++.h>\nusing namespace std;\nclass Solution\n{\npublic:\n\tvoid sortColors(vector<int> &nums)\n\t{\n\t\tint i = 0, j = nums.size() - 1;\n\t\twhile (i < j)\n\t\t{\n\t\t\tif (nums[i] == 0)\n\t\t\t{\n\t\t\t\ti++;\n\t\t\t\tcontinue;\n\t\t\t}\n\t\t\tif (nums[j] != 0)\n\t\t\t{\n\t\t\t\tj--;\n\t\t\t\tcontinue;\n\t\t\t}\n\t\t\tswap(nums[i], nums[j]);\n\t\t}\n\t\tj = nums.size() - 1;\n\t\twhile (i < j)\n\t\t{\n\t\t\tif (nums[i] == 1)\n\t\t\t{\n\t\t\t\ti++;\n\t\t\t\tcontinue;\n\t\t\t}\n\t\t\tif (nums[j] != 1)\n\t\t\t{\n\t\t\t\tj--;\n\t\t\t\tcontinue;\n\t\t\t}\n\t\t\tswap(nums[i], nums[j]);\n\t\t}\n\t}\n};", "java": "class Solution {\n\tpublic void sortColors(int[] nums) {\n\t\tint low = 0, high = nums.length - 1;\n\t\tint i = 0;\n\t\twhile (i <= high) {\n\t\t\tif (nums[i] == 0) {\n\t\t\t\tint tmp = nums[i];\n\t\t\t\tnums[i] = nums[low];\n\t\t\t\tnums[low] = tmp;\n\t\t\t\t++low;\n\t\t\t\t++i;\n\t\t\t} else if (nums[i] == 1) {\n\t\t\t\t++i;\n\t\t\t} else if (i <= high && nums[i] == 2) {\n\t\t\t\tint tmp = nums[i];\n\t\t\t\tnums[i] = nums[high];\n\t\t\t\tnums[high] = tmp;\n\t\t\t\t--high;\n\t\t\t}\n\t\t}\n\t}\n}", "js": "", "python": "class Solution(object):\n\tdef sortColors(self, nums):\n\t\tlow, mid, high = 0, 0, len(nums) - 1\n\t\twhile mid <= high:\n\t\t\tif nums[mid] == 0:\n\t\t\t\tnums[low], nums[mid] = nums[mid], nums[low]\n\t\t\t\tlow += 1\n\t\t\t\tmid += 1\n\t\t\telif nums[mid] == 1:\n\t\t\t\tmid += 1\n\t\t\telse:\n\t\t\t\tnums[high], nums[mid] = nums[mid], nums[high]\n\t\t\t\thigh -= 1\n\t\treturn nums\n# %%\ns = Solution()\nprint(s.sortColors(nums = [2,0,2,1,1,0]))", "status": 1, "keywords": "数组,双指针,排序", "license": { "cpp": "https://github.com/begeekmyfriend/leetcode", "python": "https://github.com/qiyuangong/leetcode", "java": "https://blog.csdn.net/a1439775520/article/details/104343861" }, "notebook": { "cpp": "https://codechina.csdn.net/csdn/csdn-daily-code/-/jupyter/master/data/notebook/leetcode/ipynb/74/74_cpp.ipynb?type=file", "python": "https://codechina.csdn.net/csdn/csdn-daily-code/-/jupyter/master/data/notebook/leetcode/ipynb/74/74_python.ipynb?type=file", "java": "https://codechina.csdn.net/csdn/csdn-daily-code/-/jupyter/master/data/notebook/leetcode/ipynb/74/74_java.ipynb?type=file" }, "notebook_enable": 1 }
