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原创 从数学角度看基金定投
基金定投作为很多人推荐的投资理财方案，今天我们就从数学的角度来看看，为什么基金定投会受到大家的吹捧？以及定投的策略是怎么样的！1.是什么基金定投每日/周/月用固定数目的资金买入某只基金。2. 为什么基金定投基金有涨有跌，让我们先用一个简单的模型来建模，如下，第一天基金每份净值是1元，第二天跌到了0.5元，第三天又涨回了1元。基金定投就是这3天每天都定投固定数目的金额，加入每天都定投1元，那到第三天的份额数是1/1+1/0.5+1/1=4份，如果在第三天卖出的话，就可以收..
2021-02-22 11:00:43
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原创 图片上色（有demo体验）
早期的老照片都是黑白的，通过AI技术能自动给它们上色，先来看下原理。原理基本原理就是encoder-decoder架构，然后加上一些GAN training技巧，可以使得生成的图片更加真实。代码可见https://github.com/jantic/DeOldifygithub.com值得一提的是，这里用的不是传统的GAN，传统GAN会把Generator和Discriminator放到一起end2end train，这里用了一种称之为"NoGAN"的技巧，这种技巧能使得生成的图片更少的局部瑕疵。.
2021-01-30 12:43:08
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原创 2218. Maximum Value of K Coins From Piles
There arenpilesof coins on a table. Each pile consists of apositive numberof coins of assorted denominations.In one move, you can choose any coin ontopof any pile, remove it, and add it to your wallet.Given a listpiles, wherepiles[i]is a list...
2022-05-01 10:44:39
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原创 大数据分析资料
python各种例子（比看书强100倍）https://github.com/apache/spark/tree/v3.1.1-rc3/examples/src/main/python python实现协同过滤https://blog.csdn.net/weixin_35576881/article/details/84431930 spark语法https://github.com/databricks/learning-spark/tree/master/src/python...
2021-04-20 18:20:11
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原创 C++ debug
#include <bits/stdc++.h>using namespace std;int main() { unordered_map<char, vector<int> > before; vector<int> tmp = {1,2,3};// cout<<tmp[0]<<endl; before['A'] = tmp; cout << "done" ; re.
2021-04-04 11:57:00
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原创 1739. Building Boxes
You have a cubic storeroom where the width, length, and height of the room are all equal tonunits. You are asked to placenboxes in this room where each box is a cube of unit side length. There are however some rules to placing the boxes:You can place...
2021-02-09 21:02:08
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原创 1718. Construct the Lexicographically Largest Valid Sequence
Given an integern, find a sequence that satisfies all of the following:The integer1occurs once in the sequence. Each integer between2andnoccurs twice in the sequence. For every integeribetween2andn, thedistancebetween the two occurrences ...
2021-01-12 21:17:47
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原创 1717. Maximum Score From Removing Substrings
You are given a stringsand two integersxandy. You can perform two types of operations any number of times.Remove substring"ab"and gainxpoints. For example, when removing"ab"from"cabxbae"it becomes"cxbae". Remove substring"ba"and gain...
2021-01-12 21:15:45
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原创 1723. Find Minimum Time to Finish All Jobs
You are given an integer arrayjobs, wherejobs[i]is the amount of time it takes to complete theithjob.There arekworkers that you can assign jobs to. Each job should be assigned toexactlyone worker. Theworking timeof a worker is the sum of the t...
2021-01-10 20:29:43
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原创 1722. Minimize Hamming Distance After Swap Operations
You are given two integer arrays,sourceandtarget, both of lengthn. You are also given an arrayallowedSwapswhere eachallowedSwaps[i] = [ai, bi]indicates that you are allowed to swap the elements at indexaiand indexbi(0-indexed)of arraysource. ...
2021-01-10 20:21:44
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原创 LeetCode 0~200 Medium好题
首发于微信公众号公众号链接太复杂说明的题，面试不考；太easy，太tricky的题也不收录。11.Container With Most Water33.Search in Rotated Sorted Array55.Jump Game94.Binary Tree Inorder Traversal109.Convert Sorted List to Binary Search Tree137.Single Number II11.Con...
2021-01-07 18:46:34
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原创 1443. Minimum Time to Collect All Apples in a Tree
Given an undirected tree consisting ofnvertices numbered from 0 ton-1, which has some apples in theirvertices. You spend 1 second to walk over oneedge of the tree.Return the minimum time in secondsyou have to spendin order to collect all apples in ...
2020-05-12 23:50:14
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原创 1442. Count Triplets That Can Form Two Arrays of Equal XOR
Given an array ofintegersarr.We want to select three indicesi,jandkwhere(0 <= i < j <= k < arr.length).Let's defineaandbas follows:a = arr[i] ^ arr[i + 1] ^ ... ^ arr[j - 1] b = arr[j] ^ arr[j + 1] ^ ... ^ arr[k]Note that^...
2020-05-12 23:49:10
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原创 1439. Find the Kth Smallest Sum of a Matrix With Sorted Rows
You are given anm* nmatrix,mat, and an integerk,whichhas its rows sorted in non-decreasingorder.You are allowed to choose exactly 1 element from each row to form an array.Return the Kthsma...
2020-05-05 22:28:59
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原创 1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
Given anarray of integersnumsand anintegerlimit, return the size of the longest continuous subarray such that the absolute difference between any two elements is less than or equal tolimit.In ...
2020-05-05 22:28:01
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原创 1434. Number of Ways to Wear Different Hats to Each Other
There arenpeopleand 40 types of hats labeled from 1 to 40.Given a list of list of integershats, wherehats[i]is a list of all hats preferredby thei-thperson.Return the number of ways that ...
2020-05-05 11:22:35
355
原创 1425. Constrained Subsequence Sum
Given an integer arraynumsand an integerk, return the maximum sum of anon-emptysubsequenceof that array such that for everytwoconsecutiveintegers in the subsequence,nums[i]andnums[j], wher...
2020-05-01 22:24:50
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原创 1424. Diagonal Traverse II
Given a list of lists of integers,nums,return all elements ofnumsin diagonal order as shown in the below images.Example 1:Input: nums = [[1,2,3],[4,5,6],[7,8,9]]Output: [1,4,2,7,5,3,...
2020-05-01 22:23:16
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原创 1419. Minimum Number of Frogs Croaking
Given the stringcroakOfFrogs, which represents a combination of the string "croak" from different frogs, that is, multiple frogs can croak at the same time, so multiple “croak” are mixed.Return the ...
2020-04-25 16:48:02
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原创 1420. Build Array Where You Can Find The Maximum Exactly K Comparisons
Given three integersn,mandk. Consider the following algorithm to find the maximum element of an array of positive integers:You should build the array arr which has the following properties:...
2020-04-25 16:47:55
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原创 1416. Restore The Array
A program was supposed to print an array of integers. The program forgot to print whitespaces and the array is printed as a string of digits and all we know is that all integers in the array were in t...
2020-04-21 21:03:09
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原创 1415. The k-th Lexicographical String of All Happy Strings of Length n
Ahappy stringis a string that:consists only of letters of the set['a', 'b', 'c']. s[i] != s[i + 1]for all values ofifrom1tos.length - 1(string is 1-indexed).For example, strings"abc", "...
2020-04-21 21:02:29
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原创 1414. Find the Minimum Number of Fibonacci Numbers Whose Sum Is K
Given the numberk,return the minimum number of Fibonacci numbers whose sum is equal tok, whether a Fibonacci number could be used multiple times.The Fibonacci numbers are defined as:F1= 1 F2...
2020-04-21 20:59:45
447
原创 1411. Number of Ways to Paint N × 3 Grid
You have agridof sizen x 3and you want to paint each cell of the grid with exactlyone of the three colours:Red,YelloworGreenwhile making sure that no two adjacent cells havethe same colour ...
2020-04-12 13:14:05
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原创 1406. Stone Game III
Alice and Bob continue theirgames with piles of stones. There are several stonesarranged in a row, and each stone has an associatedvalue which is an integer given in the arraystoneValue.Alice an...
2020-04-07 22:00:18
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原创 1405. Longest Happy String
A string is calledhappyif it doesnot have any of the strings'aaa','bbb'or'ccc'as a substring.Given three integersa,bandc, returnanystrings,which satisfies following conditions:sis...
2020-04-07 21:59:29
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原创 1404. Number of Steps to Reduce a Number in Binary Representation to One
Given a numbersin their binary representation. Return the number of steps to reduce it to 1 under the following rules: If the current number is even, you have to divide it by 2. If the curre...
2020-04-07 21:58:28
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原创 1392. Longest Happy Prefix
A string is called ahappy prefixif is anon-emptyprefix which is also a suffix (excluding itself).Given a strings. Return thelongest happy prefixofs.Return an empty string if no such prefi...
2020-03-25 22:45:35
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原创 1388. Pizza With 3n Slices
There is a pizza with 3n slices of varying size, you and your friends will take slices of pizza as follows:You will pickanypizza slice. Your friend Alicewill picknext slice in anti clockwise di...
2020-03-24 21:20:58
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原创 1387. Sort Integers by The Power Value
The power of an integerxis defined as the number of steps needed to transformxinto1using the following steps:ifxis even thenx = x / 2 ifxis odd thenx = 3 * x + 1For example, the power ...
2020-03-24 21:17:27
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原创 1383. Maximum Performance of a Team
There arenengineers numbered from 1 tonandtwo arrays:speedandefficiency, wherespeed[i]andefficiency[i]represent the speed and efficiency for the i-th engineer respectively.Return the maxim...
2020-03-24 21:12:16
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原创 1373. Maximum Sum BST in Binary Tree
Given abinary treeroot, the task is to return the maximum sum of all keys ofanysub-tree which is also a Binary Search Tree (BST).Assume a BST is defined as follows:The left subtree of a node c...
2020-03-16 22:05:42
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原创 1372. Longest ZigZag Path in a Binary Tree
Given a binary treeroot, aZigZag path for a binary tree is defined as follow:Chooseanynode in the binary tree and a direction (right or left). If the current direction is right then move to the...
2020-03-16 22:05:08
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原创 1371. Find the Longest Substring Containing Vowels in Even Counts
Given the strings, return the size of the longest substring containing each vowel an even number of times. That is, 'a', 'e', 'i', 'o', and 'u' must appear an even number of times.Example 1:I...
2020-03-16 22:04:29
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原创 1370. Increasing Decreasing String
Given a strings. You should re-order the string using the following algorithm:Pick thesmallestcharacter fromsandappendit to the result. Pick thesmallestcharacter fromswhich is greater th...
2020-03-16 22:03:49
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原创 1359. Count All Valid Pickup and Delivery Options
Givennorders, each order consist in pickup and delivery services.Count all valid pickup/delivery possible sequences such that delivery(i) is always after ofpickup(i).Since the answermay be t...
2020-02-29 19:25:29
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原创 1358. Number of Substrings Containing All Three Characters
Given a stringsconsisting only of charactersa,bandc.Return the number of substrings containingat leastone occurrence of all these charactersa,bandc.Example 1:Input: s = "abcabc"...
2020-02-29 19:24:46
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原创 1349. Maximum Students Taking Exam
Given am* nmatrixseatsthat represent seats distributionsin a classroom.If a seatisbroken, it is denoted by'#'character otherwise it is denoted by a'.'character.Students can see the ans...
2020-02-28 22:08:09
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原创 1344. Jump Game V
Given an array ofintegersarrand an integerd. In one step you can jump from indexito index:i + xwhere:i + x < arr.lengthand0 <x <= d. i - xwhere:i - x >= 0and0 <x <...
2020-02-02 16:31:02
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