2017/11/22 Leetcode 日记 136. Single Number Given an array of integers, every element appears twice except for one. Find that single one. class Solution { public: int singleNumber(vector<int>& nums) { int len = nums.size(); ]; ; i < len; i++){…

2017/11/21 Leetcode 日记 496. Next Greater Element I You are given two arrays (without duplicates) nums1 and nums2 where nums1’s elements are subset of nums2. Find all the next greater numbers for nums1's elements in the corresponding places of nums2.…

2017/11/13 Leetcode 日记 463. Island Perimeter You are given a map in form of a two-dimensional integer grid where 1 represents land and 0 represents water. Grid cells are connected horizontally/vertically (not diagonally). The grid is completely surro…

2017/11/14 Leetcode 日记 442. Find All Duplicates in an Array Given an array of integers, 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once. Find all the elements that appear twice in this array. Could you do it withou…

2017/11/9 Leetcode 日记 566. Reshape the Matrix In MATLAB, there is a very useful function called 'reshape', which can reshape a matrix into a new one with different size but keep its original data. You're given a matrix represented by a two-dimensiona…

2017/11/7 Leetcode 日记 669. Trim a Binary Search Tree Given a binary search tree and the lowest and highest boundaries as L and R, trim the tree so that all its elements lies in [L, R] (R >= L). You might need to change the root of the tree, so the re…

2017/11/6 Leetcode 日记 344. Reverse String Write a function that takes a string as input and returns the string reversed. class Solution { public: string reverseString(string s) { , sz = s.size()-; ; i < sz; i++, sz--){ char temp = s[i]; s[i] = s[sz];…

2017/11/5 Leetcode 日记 476. Number Complement Given a positive integer, output its complement number. The complement strategy is to flip the bits of its binary representation. Note: The given integer is guaranteed to fit within the range of a 32-bit s…

2017/11/3 Leetcode 日记 654. Maximum Binary Tree Given an integer array with no duplicates. A maximum tree building on this array is defined as follow: The root is the maximum number in the array.(根节点是数组中的最大值) The left subtree is the maximum tree const…

时间:2017.11.25 - 11.26 地点:安徽安庆 来回路费报销,住宿报销. day1: 大哥哥问了我一个实际中他们遇到的问题.有n个点,将点进行分块输出,输出各个块的均值点.具体就是100*100的矩形区域内,以0.01*0.01为一小格进行分块,输出块内的均值.n的大小大概是1e9 ~ 1e11级别的(具体忘了),很多块会是空的,没有任何点. 大概就是权衡时间与空间,但大哥哥提示我说有什么数据结构嘛,大概是提示我四叉树那种?我说来说去都是排序...总的排序时间复杂度太高,就分出一维枚…