[leetcode]二分查找总结

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leetcode二分查找问题整理

自从做完leetcode上的三道关于二分查找的题后,我觉得它是比链表找环还恶心的题,首先能写出bugfree代码的人就不多,而且可以有各种变形,适合面试的时候不断挑战面试者,一个程序猿写代码解决问题的能力都能在这个过程中考察出来. 在有序数组中寻找等于target的数的下标,没有的情况返回应该插入的下标位置 :http://oj.leetcode.com/problems/search-insert-position/ public int searchInsert(int[] A, int t…

leetcode 二分查找

https://oj.leetcode.com/problems/search-for-a-range/就是一个二分查找,没事练练手 public class Solution { public int[] searchRange(int[] A, int target) { int a[]=new int[2]; int ans=bSearch(A,target); if(ans==-1) { a[0]=-1; a[1]=-1; return a; } else { int beg=ans;…

[leetcode]二分查找总结

Search for a Range 1.最简单的想法,用最普通的二分查找,找到target,然后向左右扩张,大量的重复的target,就会出现O(n)效率. class Solution { public int[] searchRange(int[] A, int target) { ]; int a= bserch(A,target); ) {ans[]=-;ans[]=-; return ans;} //left ; &&A[b]==target) b--; ans[]=b+; b…

leetcode 二分查找 Search in Rotated Sorted ArrayII

Search in Rotated Sorted Array II Total Accepted: 18500 Total Submissions: 59945My Submissions Follow up for "Search in Rotated Sorted Array": What if duplicates are allowed? Would this affect the run-time complexity? How and why? Write a functi…

Leetcode 二分查找 Search Insert Position

本文为senlie原创,转载请保留此地址:http://blog.csdn.net/zhengsenlie Search Insert Position Total Accepted: 14279 Total Submissions: 41575 Given a sorted array and a target value, return the index if the target is found. If not, return the index where it would be i…

leetcode 二分查找 Search in Rotated Sorted Array

Search in Rotated Sorted Array Total Accepted: 28132 Total Submissions: 98526My Submissions 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 s…

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