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  • php – 在mysql中按周计算数据和分组2019-10-02 08:34:05

    这是我的数据库表: CREATE TABLE IF NOT EXISTS `inspection_report` ( `Inspection_datetime` datetime NOT NULL, `Line` char(5) NOT NULL, `S` int(11) NOT NULL, `A` int(11) NOT NULL, `B` int(11) NOT NULL, `C` int(11) NOT NULL, INSERT INTO

  • Hello Kiki HDU - 3579(扩展中国剩余定理)2019-09-18 11:41:31

    One day I was shopping in the supermarket. There was a cashier counting coins seriously when a little kid running and singing "门前大桥下游过一群鸭,快来快来 数一数,二四六七八". And then the cashier put the counted coins back morosely and count again...

  • python – 计算列在Pandas中包含特定值的次数2019-09-10 20:57:13

    假设我的数据框看起来像这样: column_name 1 book 2 fish 3 icecream|book 4 fish 5 campfire|book 现在,如果我使用df [‘column_name’].value_counts(),它会告诉我鱼是最常见的值. 但是,我希望将书归还,因为第1,3和5行包含“book”一词. 我知道.value_counts()将icecre

  • hdu3518 Boring counting(后缀数组)2019-08-27 20:02:35

    Boring counting 题目传送门 解题思路 后缀数组。枚举每种长度,对于每个字符串,记录其最大起始位置和最小起始位置,比较是否重合。 代码如下 #include <bits/stdc++.h> #define INF 0x3f3f3f3f using namespace std; typedef long long ll; const int N = 1005; char s[N]; int sa[

  • Ant Counting POJ 3046(计数dp)2019-08-25 10:52:10

    原题 题目链接 题目分析 计数dp题,感觉其实也可以用组合数学做,但我太菜了,推不出通用公式.dp可以定义dp[i][j]为前i种选j个蚂蚁有多少种选法,然后递推公式如下,其中c[i]表示第i种的数量, dp[i][j]=Σ(min(j,c[i]),k=0)dp[i-1][j-k].可以化简一下,dp[i][j]=∑(c[i],k=0)dp[i-1][j-

  • C计算地图2019-08-24 11:08:18

    最近我处理的是我确信这是一个非常常见的问题,主要归结为以下几点: 给定长文本,计算文本中出现的每个单词的频率. 我能够使用std :: unordered_map解决这个问题.然而,这对于文本中的每个单词来说都变得非常难看,如果已经遇到过这种情况,我必须进行查找,擦除,然后重新插入到地图中并

  • [POJ - 2386]Lake Counting2019-08-20 14:03:05

    这道跟前面的油田挺像的,不过从四个方向变成了八个方向 #include<cstdio>#include <cstring>using namespace std;int m, n,cnt, count;char A[101][101];int direction[8][2]={{1,1},{1,-1},{-1,1},{-1,-1},{1,0},{0,1},{0,-1},{-1,0}};void dfs(int i, int j){ if(i < 0|| j

  • POJ 2386 Lake Counting2019-08-10 16:57:08

    地址 http://poj.org/problem?id=2386 《挑战程序设计竞赛》习题 题目描述Description Due to recent rains, water has pooled in various places in Farmer John’s field, which is represented by a rectangle of N x M (1 <= N <= 100; 1 <= M <= 100) squares. Each square

  • php – 如何计算多维数组中的所有值?2019-07-27 01:29:28

    我已经尝试过许多类似问题的解决方案,但它们似乎都给了我每个数组的计数.所以我有以下数组: Array ( [1] => Array ( [0] => 1 [1] => 12 [2] => 2 ) [2] => Array ( [0] => 1 [1]

  • POJ 2386 Lake Counting2019-07-21 11:43:10

    Due to recent rains, water has pooled in various places in Farmer John's field, which is represented by a rectangle of N x M (1 <= N <= 100; 1 <= M <= 100) squares. Each square contains either water ('W') or dry land ('.�

  • Python/sorts/2019-07-05 15:07:01

    Python/sorts/cocktail_shaker_sort.py Python/sorts/counting_sort.py assert “e” == “e” assert “e” == “a” Traceback (most recent call last): File “<pyshell#88>”, line 1, in assert “e” == “a” AssertionError python中使用函数ord(),可以字

  • php – 计算行中的空列2019-05-22 23:14:43

    我有一个属性表,它有六列.用户上传照片和图像名称存储在列中. 现在我想计算每行为空的列数. 我已经能够做到这一点,但代码看起来太长了,我想编写高效的代码,是否有办法有效地重写以下内容. while($data=$select->fetch()){ $imagecounter=0; if ($data['property_image1

  • PAT1004 Counting Leaves2019-05-20 20:53:44

    A family hierarchy is usually presented by a pedigree tree. Your job is to count those family members who have no child. Input Specification: Each input file contains one test case. Each case starts with a line containing 0, the number of nodes in a tree,

  • POJ 2386 Lake Counting [DFS]2019-05-07 13:49:51

    POJ 2386 Lake Counting 简单的DFS,用了stack代替递归,输入有问题,搞了蛮久,算法是没问题。所以以后一定要记得加上检查输入的那一步 然后对于点的定义以后就这么办吧 此外还有stack的用法,也可以这样 //POJ 2386 #include <cstdio> #include <stack> using namespace std; class P

  • #Leetcode# 338. Counting Bits2019-05-06 19:41:21

    https://leetcode.com/problems/counting-bits/   Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1's in their binary representation and return them as an array. Example 1: Input: 2Output: [0

  • Counting swaps2019-04-30 16:41:08

    Counting swaps 给你一个1~n的排列,问用最少的交换次数使之变为递增排列的方案数\(mod\ 10^9+7\),1 ≤ n ≤ 10^5。 解 显然最少的交换次数不定,还得需要找到最小交换次数,而考虑到交换为复杂的过程,考虑状态的性质,所以不难想到画出,+为箭头指向方向 _ _ | + | + 2 1 4 3 + | +

  • [CodeForces 372A] Counting Kangaroos is Fun2019-04-20 23:39:49

    题目链接:http://codeforces.com/problemset/problem/372/A 二分思想 AC代码: #include <cstdio> #include <algorithm> using namespace std; int arr[500005]; int main() { int n; while(scanf("%d",&n) != EOF) { for(int i = 0;i <

  • D - Counting Black POJ - 1656 (不用树状数组的情况2019-04-11 16:49:53

     前几题运用了树状数组的 单点修改+区间查询,一维区间修改+单点查询(差分法),二维区间修改+单点查询(差分法) 这些都是树状数组的常规操作 树状数组还可以通过维护两个数组实现一维的区间修改+区间查询,详见:https://www.cnblogs.com/lcf-2000/p/5866170.html 但是二维的区间修改+区间查询

  • 1004 Counting Leaves 对于树的存储方式的回顾2019-03-24 21:47:59

    一种新的不使用左右子树递归进行树高计算的方法,使用层次遍历 树的存储方式: 1.本题提供的一种思路: 使用(邻接表的思想)二维数组(vector[n])表示树,横坐标表示 父节点,每一行表示孩子。 能够很轻松的使用dfs进行遍历 优点: 只需要知道输入的父和子的值,不需要清楚整个树的结构, 能够方便的使用

  • POJ 3046 Ant Counting(dp)2019-03-12 22:53:40

    Description: Bessie was poking around the ant hill one day watching the ants march to and fro while gathering food. She realized that many of the ants were siblings, indistinguishable from one another. She also realized the sometimes only one ant would go

  • DIVCNT2&&3 - Counting Divisors2019-03-09 21:37:57

    DIVCNT2 - Counting Divisors (square)  DIVCNT3 - Counting Divisors (cube)  杜教筛 [学习笔记]杜教筛 (其实不算是杜教筛,类似杜教筛的复杂度分析而已) 你要大力推式子: 把约数个数代换了 把2^质因子个数 代换了 构造出卷积,然后大于n^(2/3)还要搞出约数个数的式子和无完全平方数的

  • 【Codeforces 372A】Counting Kangaroos is Fun2019-02-27 20:48:48

    【链接】 我是链接,点我呀:) 【题意】 如果a[i]*2<=a[j]那么i袋鼠可以装进j袋鼠里面 每只袋鼠都只能装一只袋鼠 【题解】 假设最后的方案是(ai,bi) 这里(ai,bi)表示下标为ai的袋鼠可以装进下标为bi的袋鼠里面 (这里袋鼠已经按照大小从小到大排序了) 则我们会发现,如果有(a1

  • 1115 Counting Nodes in a BST2019-02-25 22:47:30

    题目大意: 数一个BST(二叉查找树)最后两层节点的数量。 解题思路: 维护一个深度参数,建树时记录下最大深度然后BFS遍历统计即可。 代码如下: #include<iostream> #include<algorithm> #include<cstdio> #include<queue> using namespace std; int n,ma=0,n1,n2; struct node { nod

  • POJ 2386 Lake Counting2019-02-05 21:37:53

    Lake Counting Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 48370   Accepted: 23775 Description Due to recent rains, water has pooled in various places in Farmer John's field, which is represented by a rectangle of N x M (1

  • [SPOJ] DIVCNT2 - Counting Divisors (square)2019-02-02 23:40:17

    题解: 操作挺多的一道题 网上证明挺多就不打了 $\sigma_0(n^2) = \sum_{d\mid n} 2^{\omega(d)} = \sum_{d\mid n} \sum_{e\mid d} \mu^2(e) = ((\mu^2 * 1) * 1) (n)$ $(\mu * 1) * 1 = \mu * (1*1) = \mu * \sigma_0$ $\sum_{i=1}^n \mu^2(i) = \sum_{i=1}^{\sqrt{n}}\mu(i)

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