maximum 10827 torus sum
1798.maximum number of consecutive values you can make
Description 1798.maximum-number-of-consecutive-values-you-can-make Solution Greedy algorithm + dynamic programming First, we sort the array in ascendi ......
1775.equal sum arrays with minimum number of operations
Description 1775.equal-sum-arrays-with-minmum-number-of-operations Solution hash table + greedy algorithm The general idea of this problem is hash + g ......
[ARC150F] Constant Sum Subsequence
Problem StatementWe have a sequence of positive integers of length $N^2$, $A=(A_1,\ A_2,\ \dots,\ A_{N^2})$, and a positive integer $S$. For this sequ ......
openpyxl模块---------------------------求和sum
准备数据: 求和代码: import openpyxlwb = openpyxl.load_workbook('C:/Users/Administrator/Desktop/1.xlsx')ws = wb['test']min_row = ws.min_rowmax_row = ws.max_row ......
918. Maximum Sum Circular Subarray (Medium)
Description 918. Maximum Sum Circular Subarray (Medium) Given a circular integer array nums of length n, return the maximum possible sum of a non-empt ......
[LeetCode] 2208. Minimum Operations to Halve Array Sum
You are given an array nums of positive integers. In one operation, you can choose any number from nums and reduce it to exactly half the number. (Not ......
CodeForces 1810G The Maximum Prefix
[洛谷传送门](https://www.luogu.com.cn/problem/CF1810G "洛谷传送门") [CF 传送门](https://codeforces.com/problemset/problem/1810/G "CF 传送门") 感觉是比较 educational 的题。 拿到 ......
md5sum
md5sum 计算和校验文件报文摘要的工具程序 ## 补充说明 **md5sum命令** 采用MD5报文摘要算法(128位)计算和检查文件的校验和。一般来说,安装了Linux后,就会有md5sum这个工具,直接在命令行终端直接运行。 MD5算法常常被用来验证网络文件传输的完整性,防止文件被人篡改。M ......
nodejs sqlite报错 typeorm[ Expression tree is too large (maximum depth 1000)]
最近在给公司开发一个工具时,使用SQLite,然后突然发现报错: ```js (node:16195) UnhandledPromiseRejectionWarning: QueryFailedError: SQLITE_ERROR: Expression tree is too large (ma ......
ARC125F Tree Degree Subset Sum
感觉挺不错的一道题,不过课上 pb 好像没有讲。 显然树的具体形态对题目影响不大,那么我们知道 $\sum\limits_{i=1}^nd_i=2n-2$ 即可扔掉树的条件。即: > 给定 $n$ 个 $d_i$,和为 $2n-2$,求 $(x,y)$ 满足 $0\le x\le n$ 且 $\ex ......
ERROR 1709 (HY000): Index column size too large. The maximum column size is 767 bytes.
MySQL版本5.6.35 在一个长度为512字符的字段上创建unique key报错 CREATE DATABASE dpcs_metadata DEFAULT CHARACTER SET utf8; select * from information_schema.SCHEMATA; + + + ......
[LeetCode] 1349. Maximum Students Taking Exam 参加考试的最大学生数
Given a `m * n` matrix `seats` that represent seats distributions in a classroom. If a seat is broken, it is denoted by `'#'` character otherwise it i ......
CF280D k-Maximum Subsequence Sum
大半个月前做的题,现在才写题解,/qd/qd。 贪心,选出 $k$ 个不相交子段的和的最大值,其实相当于每次把序列最大子段拎出来,加上去,然后取相反数。 证明的话可以考虑模拟费用流,$i\le n$,$S\to i$ 连边,$i\to i+1$ 连边,$i\to T$ 连边,边的流量均为 $1$,$ ......
LG4868 Preprefix sum 题解
# 壹、题目大意 给出长度为 $n$ 的序列 $a_1 \sim a_n$,设 $S_i = \sum\limits_{j=1}^i a_j$,有两种操作 可以给定 $i$ 和 $x$,使得 $a_i = x$,也可以给定 $i$,查询 $\sum\limits_{j=1}^i S_j$ 的值 $n ......
Sum of (-1)^f(n)
煎蛋提。 不妨令 $g(i)=(-1)^{f(i)}$,由 $f(i)$ 的和性不难推出 $g(i)$ 为**完全积性函数**,因此可以考虑杜教筛。 考察 $g(n)$ 和恒等函数 $I(n)=1$ 的卷积 $g*I$,不难发现 $(g*I)(p^k)=\sum\limits_{i=0}^kg(p^ ......
ARC145F Modulo Sum of Increasing Sequences
为数不多不用多项式科技的单位根反演题。 $A$ 不降比较难搞,所以首先令 $B_i=A_i+i-1$,则 $B$ 单调递增。转化为对任意的 $k\in [0,\text{MOD}-1]$,求在 $[0,N+M-1]$ 中选 $N$ 个**不同**的数,总和对 $\text{MOD}$ 取模为 $k$ ......
ARC163D Sum of SCC
### Description 给定 $N,M$,求对于所有 $N$ 个点的,满足恰有 $M$ 条从小连向大的边,即 $\sum\limits_{(u,v)\in E}[u 给竞赛图每个 SCC (强连通分量)缩点后,剩下的是由一条**极长**的链与某些前向边组成的图。 于是 SCC 的数量能够转换 ......
sha256sum
sha256sum 用于计算文件的 SHA-256 哈希值 ## 补充说明 **sha256sum命令** 是打印或检查 SHA256(256位)校验 ### 语法 ```shell sha256sum [OPTION]... [FILE]... ``` ### 选项 ```shell -b, -- ......
sum
sum 计算文件的校验码和显示块数 ## 补充说明 **sum命令** 用于计算并显示指定文件的校验和与文件所占用的磁盘块数。 ### 语法 ```shell sum(选项)(参数) ``` ### 选项 ```shell -r:使用BSD的校验和算法,块大小为1k; -s:使用system V的校 ......
Atcoder Grand Contest 057 D - Sum Avoidance
先来找些性质: - $A$ 中最小的元素 $M$ 肯定是最小的不是 $S$ 的因子的数,由于 $\text{lcm}(1,2,3,\cdots,43)>10^{18}$,所以 $M\le 43$。 - 对于每个 $0\le iS)break; for(int j=1;j>1; if(calc(mid ......
常用的统计数学函数:sum, sd, mean, cv
```c++ /*********************************************************************** * @file math.h * @ingroup math * @author wangqing * @date 2020-05-14 * ......
[LeetCode] 2461. Maximum Sum of Distinct Subarrays With Length K
You are given an integer array nums and an integer k. Find the maximum subarray sum of all the subarrays of nums that meet the following conditions: T ......
834. Sum of Distances in Tree (Hard)
Description 834. Sum of Distances in Tree (Hard) There is an undirected connected tree with n nodes labeled from 0 to n - 1 and n - 1 edges. You are g ......
[Javascript] How to fix iphone safari auto zoom in problem without `maximum-scale=1.0`
Solution 1: consider change font-size to 16px or above Soution 2: using javascript if(navigator.userAgent.indexOf('iPhone') > -1 ) { document .querySe ......
UVA10791 最小公倍数的最小和 Minimum Sum LCM 题解
### 前言 长沙市一中8机房0714模拟测1。 [传送门](https://www.luogu.com.cn/problem/UVA10791) [blog](https://www.luogu.com.cn/blog/JJL0610666/solution-uva10791) # 思路 本题思路 ......
linux 中 md5sum -c选项
001、 [root@PC1 test01]# ls [root@PC1 test01]# seq 5 > a.txt; seq 3 > b.txt ## 生成测试数据 [root@PC1 test01]# ls a.txt b.txt [root@PC1 test01]# md5sum b.txt ......
Atcoder AGC062C Mex of Subset Sum
对 $a_i$ 从小到大进行排序,因为想到若 $ a_{i - 1}$ 肯定是能保证取不到的。 对排完序的 $a_i$ 做一个前缀和 $s_i = \sum\limits_{j = 1}^n$,令 $A_i$ 为 $a_{1\sim i}$ 中无法表示为子序列之和且 $ s_{i - 1} > x$ ......
excel 导出 The maximum length of cell contents (text) is 32767 characters
**导出excel功能,报错。错误日志提示::The maximum length of cell contents (text) is 32767 characters** ![](https://img2023.cnblogs.com/blog/2197916/202307/2197916-20 ......
PAT-甲级-1007 Maximum Subsequence Sum C++
Given a sequence of K integers { N1, N2, ..., NK }. A continuous subsequence is defined to be { Ni, Ni+1, ..., Nj } where 1≤i≤j≤K. The Maximum S ......
[LeetCode] 2542. Maximum Subsequence Score
You are given two 0-indexed integer arrays nums1 and nums2 of equal length n and a positive integer k. You must choose a subsequence of indices from n ......