【leetcode】148. Sort List Sort a linked list inO(nlogn) time using constant space complexity. 链表排序可以用很多方法,插入,冒泡,选择都可以,也容易实现,但是复杂度不符合题意要求。 然后时间复杂度在O(nlogn)的排序算法中,堆排序,快速排序,归并排序。 堆排序,主要是基于数组的,这里是链表,实现起来比较...
The values at even indices 0 and 2 are sorted in non-decreasing order. Return the array formed after rearranging the values of nums. Example 1: Input: nums = [4,1,2,3] Output: [2,3,4,1] Explanation: First, we sort the values present at odd indices (1 and 3) in non-increasing...
merge(left_half, right_half) def merge(self, left, right): # 初始化一个空的已排序数组 sorted_array = [] # 初始化左右两部分的指针 i = j = 0 # 遍历两个数组,每次循环将较小的元素添加到已排序数组中 while i < len(left) and j < len(right): if left[i] < right[j]: sorted_arra...
}intfindKthLargest(vector<int>& nums,intk){intleft =0, right = nums.size() -1;while(true) {intpos =partition(nums, left, right);if(pos == k -1)returnnums[pos];if(pos > k -1) right = pos -1;elseleft = pos +1; } } }; Heapsort Well, this problem still has a tag "...
2360. 图中的最长环 47.3% 困难 2371. 最小化网格中的最大值 59.1% 困难 2392. 给定条件下构造矩阵 57.9% 困难 2603. 收集树中金币 58.4% 困难 3383. 施法所需最低符文数量 24.0% 困难 3435. 最短公共超序列的字母出现频率 37.7% 困难 3481. 应用替换 89.4% 中等 3530. 有向无环图中合法拓扑排序的...
LeetCode 衍生问题 算法前面说的比较清楚,直接说两个比较难的问题: Mergeksorted linked lists and return it as one sorted list. Analyze and describe its complexity. publicclassListNode{intval;ListNodenext;ListNode(intx){val=x;}} 解法1: ListNodedummy=newListNode(0);publicListNodemergeKLists(ListNode[...
int[] res; public int[] searchRange(int[] nums, int target) { res = new int[]{-1, -1}; help(nums, target, 0, nums.length-1); return res; } public void help(int[] nums, int target, int s, int e){ if(s > e) return; int mid = (s+e) / 2; if(nums[mid] == ...
4.重复步骤1~3,直到排序完成。动图演示代码实现 C++vector<int> bubbleSort(vector<int>& arr) { int len = arr.size(); for (int i = 0; i < len - 1; i++) { for (int j = 0; j < len - 1 - i; j++) { if (arr[j] > arr[j + 1]) { // 相邻元素两两对比 int temp ...
The vowels are'a','e','i','o', and'u', and they can appear in lowercase or uppercase. Consonants comprise all letters that are not vowels. Example 1: Input: s = "lEetcOde" Output: "lEOtcede" Explanation: 'E', 'O', and 'e' are the vowels in s; 'l', 't', 'c', and...
package leetcode import ( "sort" ) func frequencySort(s string) string { if s == "" { return "" } sMap := map[byte]int{} cMap := map[int][]byte{} sb := []byte(s) for _, b := range sb { sMap[b]++ } for key, value := range sMap { cMap[value] = append(cMap[va...