2018-07-08 Hash

2018-07-08  本文已影响0人  冰西瓜大郎

一致性hash算法:https://www.cnblogs.com/xrq730/p/5186728.html

需要知道什么是hash一致性算法,并且其中的一些概念?
http://www.zsythink.net/archives/1182

java 排序算法实现:
冒泡排序:

/*
遍历一遍,把最大的放到最后
例子:2,1,7,4,3
比较第一次:1,2,7,4,3
比较第二次:1,2,7,4,3
比较第三次:1,2,4,7,3
比较第四次:1,2,4,3,7
*/
    public int[] bubbleSort(int[] nums) {
        int length = nums.length;
        int curr = 0;
        for(int i = 0; i < length; i++) {
            for(int j = 0; j< length -i-1;j++) {
                if (nums[j] > nums[j+1]) {
                    curr = nums[j];
                    nums[j] = nums[j+1];
                    nums[j+1] = curr;
                }
            }
        }
        return nums;
    }

时间复杂度:O(n*n)

鸡尾酒排序,冒泡排序的改进,正反向遍历
/**
     *鸡尾酒排序
     * @param nums
     * @return
     */
    public int[] bubbleSort2(int[] nums) {
        int length = nums.length;
        int num = 0;
        for (int i = 0;i < length/2 ; i++) {
            /*正向循环*/
            for (int j = i; j < length-i-1;j++) {
                if (nums[j] > nums[j+1]) {
                    num = nums[j];
                    nums[j] = nums[j+1];
                    nums[j+1] = num;
                }
            }

            for (int j= length-i-1; j > i;j--) {
                if (nums[j] < nums[j-1]) {
                    num = nums[j];
                    nums[j-1] = nums[j];
                    nums[j] = num;
                }
            }
        }
        return nums;
    }

时间复杂度也是O(n*n)

选择排序,选择最大的,交换位置
public int[] choiceSort(int[] nums){
        int localtion = 0;
        int curr = 0;
        int length = nums.length;
        for (int i = 0; i < length; i++) {
            for (int j = i; j < length;j++) {
                if (nums[j] > nums[localtion]) {
                    localtion = j;
                }
            }
            curr = nums[i];
            nums[i] =nums[localtion];
            nums[localtion] = curr;
            localtion = i+1;
        }
        return nums;
    }
时间复杂度也是O(n*n)

https://github.com/francistao/LearningNotes/blob/master/Part3/Algorithm/Sort/%E9%9D%A2%E8%AF%95%E4%B8%AD%E7%9A%84%2010%20%E5%A4%A7%E6%8E%92%E5%BA%8F%E7%AE%97%E6%B3%95%E6%80%BB%E7%BB%93.md

http://www.hollischuang.com/archives/2509
jvm

https://juejin.im/post/5b42c01ee51d45194e0b819a?utm_source=gold_browser_extension

面试感悟:
http://www.cnblogs.com/xrq730/p/5260294.html#4011758

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