Given a sorted array, for example: // [2,5,6,8,11,12,15,18] Then we rotated it 1 time, it becomes: // [18, 2,5,6,8,11,12,15] 2 times: // [15,182,5,6,8,11,12] So now given you an array which is rotated N times based on an sorted array, try to find the…

function findInCircularlySortedAry (ary = [], target) { ) { ; } ) { ] === target ? : -; } let , high = ary.length - ; while(low <= high) { let mid = Math.floor((low + high) / ); // case 1: target === middle item, return found if (ary[mid] === target)…

Let's say we are going to find out number of occurrences of a number in a sorted array using binary search in O(log n) time. For example the given array is: [1,1,3,5,5,5,5,5,9,11], the number 5 appears 5 times; the number 3 appears 1 time; 2 appears…

Suppose a sorted array is rotated at some pivot unknown to you beforehand. (i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2). You are given a target value to search. If found in the array return its index, otherwise return -1. You may assume no duplic…

问题: Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length. Do not allocate extra space for another array, you must do this in place with constant memory. For example, Given input array…

Given a big sorted array with positive integers sorted by ascending order. The array is so big so that you can not get the length of the whole array directly, and you can only access the kth number by ArrayReader.get(k) (or ArrayReader->get(k) for C+…

http://acm.hdu.edu.cn/contests/contest_showproblem.php?cid=646&pid=1006 #include<iostream> #include<algorithm> #include<stdio.h> #include<stdlib.h> #include<string.h> using namespace std; ; int ac[maxn],flag,n; int Increa…

这是我在逛 Stack Overflow 时遇见的一个高分问题:Why is processing a sorted array faster than an unsorted array?,我觉得这是一个非常好的用来讲分支预测(Branch Prediction)的例子,分享给大家看看 一.问题引入 先看这个代码: #include <algorithm> #include <ctime> #include <iostream> #include <stdint…

Almost Sorted Array Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 447    Accepted Submission(s): 201 Problem Description We are all familiar with sorting algorithms: quick sort, merge sort,…

Suppose a sorted array is rotated at some pivot unknown to you beforehand. (i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2). You are given a target value to search. If found in the array return its index, otherwise return -1. You may assume no duplic…