《漫画算法2》源码整理-3 二分查找 跳跃表

二分查找

public class BinarySearch {
    public static int binarySearch(int[] array, int target) {
        //查找范围起点
        int start = 0;
        //查找范围终点
        int end = array.length - 1;
        //查找范围中位数
        int mid;

        while (start <= end) {
            //mid=(start+end)/2 有可能溢出
            mid = start + ((end - start) / 2);
            if (array[mid] == target) {
                return mid;
            } else
            if (array[mid] < target) {
                start = mid + 1;
            } else {
                end = mid - 1;
            }
        }
        return -1;
    }

    public static void main(String[] args) {
        int[] array = new int[1000];
        for (int i = 0; i < 1000; i++) {
            array[i] = i;
        }
        System.out.println(binarySearch(array, 173));
    }
}

跳跃表

import java.util.Random;

public class SkipList{

    //结点“晋升”的概率