桶排序 && leetcode 41

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桶排序 && leetcode 41

桶排序对于0-1000 ,用1001个桶简单版或者用10个桶0-9,先按各位装桶,然后依(桶)次放回,然后再按十位放桶,放回,然后百位. 也就是基数排序 https://www.cnblogs.com/lqerio/p/11901828.html Leetcode41 设数组长度为n 那么答案必在 1-n+1的范围内.那么一个萝卜一个坑先做预处理.类似于桶排序,把正确的数放在正确的位置. 遍历数组,对于i+1,若i+1在1-n内,应该放在nums[i]的位置上 if (nums[i] …

【leetcode 桶排序】Maximum Gap

1.题目 Given an unsorted array, find the maximum difference between the successive elements in its sorted form. Try to solve it in linear time/space. Return 0 if the array contains less than 2 elements. You may assume all elements in the array are non-…

[LeetCode] 桶排序的特殊解，例 Sort Color

Sort Colors Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red, white and blue. Here, we will use the integers 0, 1, and 2 to represent the color red, w…

Bucket Sort - leetcode [桶排序]

桶排序(Bucket sort)或所谓的箱排序,是一个排序算法,工作的原理是将数组分到有限数量的桶里.每个桶再个别排序(有可能再使用别的排序算法或是以递归方式继续使用桶排序进行排序).桶排序是鸽巢排序的一种归纳结果.当要被排序的数组内的数值是均匀分配的时候,桶排序使用线性时间(Θ(n)).但桶排序并不是比较排序,他不受到O(n log n)下限的影响. 桶排序以下列程序进行: 设置一个定量的数组当作空桶子. 寻访序列,并且把项目一个一个放到对应的桶子去. 对每个不是空的桶子进行排序. 从不是空的…

leetcode算法题3：分组，让每个组的最小者，相加之后和最大。想知道桶排序是怎么样的吗？

/* Given an array of 2n integers, your task is to group these integers into n pairs of integer, say (a1, b1), (a2, b2), -, (an, bn) which makes sum of min(ai, bi) for all i from 1 to n as large as possible. Example 1: Input: [1,4,3,2] Output: 4 Expla…

[array] leetcode - 41. First Missing Positive - Hard

leetcode - 41. First Missing Positive - Hard descrition Given an unsorted integer array, find the first missing positive integer. For example, Given [1,2,0] return 3, and [3,4,-1,1] return 2. Your algorithm should run in O(n) time and uses constant s…