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…

Given an array consists of non-negative integers, your task is to count the number of triplets chosen from the array that can make triangles if we take them as side lengths of a triangle. Example 1: Input: [2,2,3,4] Output: 3 Explanation: Valid combi…

Count the number of occurrences in a sorted array Given a sorted array arr[] and a number x, write a function that counts the occurrences of x in arr[]. Expected time complexity is O(Logn) Examples: Input: arr[] = {1, 1, 2, 2, 2, 2, 3,}, x = 2 Output…

(binary search trees) which form the basis of modern databases and immutable data structures. Binary search works very much the way humans intuitively search for a name in a yellow pages directory (if you have ever seen one) or the dictionary. In thi…

Complexity: O(log(n)) Ref: Binary search algorithm or 二分搜索算法 Ref: C 版本 while 循环 C Language scripts by McDelfino: #include <stdio.h> #include <stdlib.h> int getIndex(int* arr, int length, int num); int main() { int arr[100]; for (int i = 0; i &…

js binary search algorithm js 二分查找算法 二分查找, 前置条件 存储在数组中 有序排列 理想条件: 数组是递增排列,数组中的元素互不相同; 重排 & 去重 顺序: 递增排列/递减排列; 重复: 数组中存在相同的元素; "use strict"; /** * * @author xgqfrms * @license MIT * @copyright xgqfrms * @created 2020-05-20 * @modified * * @des…

http://www.practice.geeksforgeeks.org/problem-page.php?pid=380 Largest Number formed from an Array Given a list of non negative integers, arrange them in such a manner that they form the largest number possible. The result is going to be very large,…

38. Search a 2D Matrix II https://www.lintcode.com/problem/search-a-2d-matrix-ii/description?_from=ladder&&fromId=1 这道题与二分法有什么关系呢? -把整个二维数组从对角线分成两半,从左下角开始,往右上角逼近. public class Solution { /** * @param matrix: A list of lists of integers * @param ta…

254. Drop Eggs https://www.lintcode.com/problem/drop-eggs/description?_from=ladder&&fromId=1 28. Search a 2D Matrix https://www.lintcode.com/problem/search-a-2d-matrix/description?_from=ladder&&fromId=1 思路1: 1. find the row index, the last…

We are playing the Guess Game. The game is as follows: I pick a number from 1 to n. You have to guess which number I picked. Every time you guess wrong, I'll tell you whether the number is higher or lower. You call a pre-defined API guess(int num) wh…