2.Binary Search[lintcode] View Code 一开始以为是普通的binary search,后来发现它是要返回第一个target的位置(即有可能有duplicates)。借助lowerbound函数即可。 四、 1.Search in Rotated Sorted Array O(logN): View Code 另一种方法:利用下面3. Find Minimum先把min的index找出来,然后根据target在哪个范围来...
leetcode,第704题,binary search, Given a sorted (in ascending order) integer array nums of n elements and a target value, write a function to search target in nums. If target exists, then return its index, otherwise return -1. Example 1: Input: nums = [-1,0,3,5,9,12], target =...
下面可以试着在力扣上找一些二分查找的简单的题,要注意一点的是在搜索binary search时,会有binary search tree BST的题目出现,这就是另外的一套算法了,和上面说的不是很通用。 在多做一些题目后,可以发现潜在的规律的。 下面这道力扣的第74题可以尝试一下,但是在做题的过程中可能需要一些对于2D数组的认识,下一...
Theorem If there are only one black pixel region, then in a projected 1D array all the black pixels are connected. This means we can do a binary search in each half to find the boundaries, if we know one black pixel's position. And we do know that. To find the left boundary, do ...
https://leetcode.com/problems/all-nodes-distance-k-in-binary-tree/ 8. Pattern: Tree Depth First Search,树上的DFS 树形DFS基于深搜(Depth First Search (DFS))技术来实现树的遍历。 咱们可以用递归(或是显示栈,如果你想用迭代方式的话)来记录遍历过程中访问过的父节点。
Can you solve this real interview question? Search a 2D Matrix - You are given an m x n integer matrix matrix with the following two properties: * Each row is sorted in non-decreasing order. * The first integer of each row is greater than the last int
This is a follow up problem toSearch in Rotated Sorted Array, wherenumsmay contain duplicates. Would this affect the run-time complexity? How and why? 在旋转有序数组中搜索二。 这题跟33题求的一样,多一个条件是input里面有重复数字。依然是用二分法做,但是worst case很可能会到O(n);而且其中一开...
Range Sum Query 2D – Immutable 【题目】Given a 2D matrix matrix, find the sum of the elements inside the rectangle defined by its upper left corner (_row_1, _col_1) and lower right corner (_row_2, _col_2). The above rectangle (with the red border) is defined by (row1,...
Search in Rotated Sorted Array II 30.9% Medium Multiply Strings 【题目】Given two numbers represented as strings, return multiplication of the numbers as a string. Note: The numbers can be arbitrarily large and are non-negative. 【解答】按照自己在草稿上计算多位数乘以多位数的的方法那样计算,这种...
leetcode/91/binary-search.md Go to file Go to file T Go to line L Copy path Cannot retrieve contributors at this time 772 lines (552 sloc) 28.5 KB Raw Blame 二分查找 二分查找又称折半搜索算法。 狭义地来讲,二分查找是一种在有序数组查找某一特定元素的搜索算法。这同时也是大多数...