先贴一段C++标准(ISO/IEC 14882:2003):5.2.1 Subscripting:1 A postfix expression followed by an expression in square brackets is a postfix expression. One of theexpressions shall have the type “pointer to T” and the other shall have enumeration or integral type. Theresult is an lvalue of type “T.” The type “T” shall be a completely-defined object type.56) The expressionE1[E2] is identical (by d...
1. 定义：用于在数组的末端添加一个或多个元素，并返回添加新元素后的数组长度。注意，该方法会改变原数组 2. 代码使用push方法，往数组中添加了四个成员1 var arr = []; 2 console.log(arr.push(1)); //1 3 console.log(arr.push(a)); //2 4 console.log(arr.push(true,{}));//4 5 console.log(arr); // [1, a, true, {}]?
#!/bin/env perl2 use DBI;3 4 my $dbh=DBI->connect("dbi:Oracle:gzgldb","nrmdb","nrmoptr123") or die "connect db error!";5 6 my $sql=‘select * from router‘;7 8 my $sth=$dbh->prepare($sql);9 10 $sth->execute() or die "execute sql error!"; 11 12 my @row1=$sth->fetchrow_array(); 13 print "@row1 \n"; 14 @row1=$sth->fetchrow_array(); 15 print "@row1 num2 \n"; 16 17 my @row=$dbh->selectrow_array($sql...
题目链接： https://leetcode.com/problems/remove-duplicates-from-sorted-array/?tab=Description 从有序数组中移除重复数字，并且返回不重复数字的个数 遍历操作： 可以使用新的for循环 for (int n : nums){} 每次进行对比，并且更新第一个遇到不相等的元素的下标为i对数组进行重新赋值操作 当数组长度大于1时，ans初值为1,当数组长度为0时，返回0 参考代码 ： package leetcode_50;/**** * @author pengfei_zheng* 移除有序数组...
[CF718C] Sasha and Array - 线段树,矩阵乘法 Description 用 \(f_i\) 来表示第 \(i\) 个斐波那契数，给定一个 \(n\) 个数的序列 \(a\)。有 \(m\) 次操作，操作有两种：将 \(a_l\sim a_r\) 加上 \(x\)；求 \(\displaystyle\left(\sum_{i=l}^r f_{a_i}\right)\bmod (10^9+7)\) Solution 如果我们用线段树维护矩阵的和，那么每次区间修改操作可以视作区间矩阵乘法 #include <bits/stdc++.h> using namespace std;#define int long lo...
E - Array Shrinking用dp[i][j].fi表示连通块的大小，用dp[i][j].se表示连通块表示的数。然后再进行动态规划，a[i]表示从1~i可以得到的最短长度。// Created by CAD on 2020/3/9. #include <bits/stdc++.h>#define fi first #define se second #define pii pair<int,int> using namespace std;pii dp[505][505]; int a[505]; int main() {ios::sync_with_stdio(false);cin.tie(0);int n;cin>>n;for(int i=1;i<=n;++i)cin>>dp[i][i]...
Given a non-empty array of numbers, a0, a1, a2, … , an-1, where 0 ≤ ai < 231.Find the maximum result of ai XOR aj, where 0 ≤ i, j < n.Could you do this in O(n) runtime?Example:Input: [3, 10, 5, 25, 2, 8]Output: 28Explanation: The maximum result is 5 ^ 25 = 28. classSolution:def findMaximumXOR(self, nums):""" :type nums: List[int] :rtype: int """ head = self.buildTrie...
04 - Array Cardio Day 1// Array.prototype.filter()// 1. Filter the list of inventors for those who were born in the 1500'sconst filterArr = inventors.filter(inventors => inventors.year>=1500 && inventors.year <1600);Console.log(filterArr);const Arr = inventors.map(inventors => `${inventors.first} ${inventors.passed}`);Console.log(Arr);const oldersArr = inventors.sort((a,b)=> a.year - b.year);conso...
一维数组数组在Java中被看作一个对象 初始化数组 int [] money=new int[6] 规定数组的大小 int [] sno=new int[]{1,2,3,4,5};初始化数组中的每一个元素 int [] number={6,7,8,9} int[] array;或int array[]int 数组元素类型array 数组名称new 对象初始化语句创建一维数组 实质上就是在内存中为数组创建相应的存储空间，在创建数组时需要用花括号{}将数值放入存储空间内。 存储空间的分配由Java编译器负责，相当于new int [] arr...
数组的定义 var arr = [1, 2, 3, 4, "one", "two", "three", "four"]; //一维数组var props = [["拳头", "刀", "枪"], ["boxing", "knife ", "gun"]]; //二维数组调用 console.log(arr[0]);console.log(props[0][0]);JS对数组的遍历for (var i in arr) {//可能性不高 console.log(arr[i]);}for (var i = 0; i < arr.length; i++) { //性能差的 console.log(arr[i]);}for (var i = 0, max = arr.lengt...
Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length.Do not allocate extra space for another array, you must do this in place with constant memory.For example,Given input array A = [1,1,2],Your function should return length = 2, and A is now [1,2].解法很简单，边界条件A为null或者长度为0，返回0；否则，用variable size来维护题目要求的数...
目录 1.STL的容器类介绍2.容器类array的基本使用1.STL的容器类介绍【1】何为容器 顾名思义，容器就是盛放东西的东西，这里被盛放的一般是数据对象，用来盛放的是容器类计算机中一切皆是数据，数据存储只能在内存中，而容器类是用做容器的内存的管理方法容器类的内核就是：数据结构 + 算法C语言语法内置的数组和结构体，就是语言源生支持的容器C++容器通过类库方式提供，容器类库被模板技术泛化后，就是STL容器了。可见STL的本质其实...
/** 167.Two Sum II-Input array is sorted* 2016-6-4 by Mingyang* Given an array of integers that is already sorted in ascending order, * find two numbers such that they add up to a specific target number.*The function twoSum should return indices of the two numbers such that they add up to the target, *where index1 must be less than index2. *Please note that your returned answers (both index1 and i...
Given an array where elements are sorted in ascending order, convert it to a height balanced BST.基本思路：由于队列已经进行排序，每次取其中点，作为树的根。即可建得一棵平衡二叉树。/*** Definition for a binary tree node.* struct TreeNode {* int val;* TreeNode *left;* TreeNode *right;* TreeNode(int x) : val(x), left(NULL), right(NULL) {}* };*/ class Solution { public:TreeNode* sortedA...
array 和 asarray 都可以将 结构数据 转化为 ndarray，但是主要区别就是当数据源是ndarray时，array仍然会copy出一个副本，占用新的内存，但asarray不会。1.输入为列表时import numpy as npa=[[1,2,3],[4,5,6],[7,8,9]] b=np.array(a) c=np.asarray(a) a[2]=1 print(a) print(b) print(c)""" 运行结果： [[1, 2, 3], [4, 5, 6], 1] [[1 2 3][4 5 6][7 8 9]] [[1 2 3][4 5 6][7 8 9]] """ 从中我们可以看出np.array与np.asarray功...