4980: rescue operation

4980: rescue operation ----------- Total time limit: 1000ms memory limit: 65536kB describe The princess was taken away by the wicked and imprisoned somewhere in the cell. Cells are represented by a matrix of n * m (n, m < = 200). Each item in the matrix can represent a road (@), a wall (ා), and ...

Posted on Wed, 26 Feb 2020 04:26:03 -0800 by AbiusX

Design pattern Overview - structural pattern

Last article "Design pattern Overview - creation pattern" After sorting out the five types of creation mode, let's go on to sort out the structural mode. The purpose of a structural pattern is to describe how classes or objects can be combined to form a larger structure. The class structur ...

Posted on Tue, 25 Feb 2020 05:05:05 -0800 by kashmirekat

[Android design mode] abstract factory mode

Abstract factory schema definition]: Provides an interface for creating a set of related or interdependent objects without specifying their concrete classes. [usage scenario of abstract factory]: Abstract factory pattern can be used when an object family has the same constraints. Does it sound abstr ...

Posted on Tue, 25 Feb 2020 02:52:19 -0800 by sean paul

C#push SDK push Android+iOS

Download push SDK s and find direct references to these two dll s. using reference using com.gexin.rp.sdk.dto; using com.igetui.api.openservice; using com.igetui.api.openservice.igetui; using com.igetui.api.openservice.igetui.template; using com.igetui.api.openservice.igetui.template.notify; using com.igetui.api.openservice.payload;   Both s ...

Posted on Mon, 24 Feb 2020 18:47:16 -0800 by spectacell

Java date class - date API after JDK8

JDK 1.0 contains a java.util.Date class, but most of its methods have been deprecated since JDK 1.1 introduced the Calendar class Now. Calendar is not much better than Date. The problems they face are: Variability: classes like date and time should be immutable. Offset: the year in Date starts from 190 ...

Posted on Sun, 23 Feb 2020 21:08:32 -0800 by solar_ninja

February 19, 2020

February 19, 2020 vector Vector means vector, which can be used as a variable size array with a maximum size of 2e9. More details are available vector analysis of the big guy. Today's questions are more difficult for the people, but each question has something to pay attention to. Lin Da OJ 1675 mid ...

Posted on Wed, 19 Feb 2020 02:46:12 -0800 by Cenron

Java collection defragmentation (1)

Classification of sets: 1.collection interface List interface ArrayList class Vector class LinkedList class Set interface HashSet class TreeSet class List: the stored objects are orderly (the order of the elements is the same as the order of adding) and can be repeated ArrayList: the underlying data structure is array. The thre ...

Posted on Sat, 15 Feb 2020 10:47:56 -0800 by amo

Core data: the fastest way to delete all instances of an entity

I am using Core Data to keep the results of web service calls locally. Web services return the complete object model for "cars" - maybe 2000 (and I can't have web services return less than one or all cars). The next time I open my application, I want to refresh the Core Data persistent copy by invoking the Web services of all cars ...

Posted on Sat, 15 Feb 2020 06:52:20 -0800 by emma57573

February 13, 2020 winter holiday training eight (priority queue)

Problem A: NEFU1537 buy Rice Structure, overload operator #include<bits/stdc++.h> using namespace std; struct node{ int t, No; }; priority_queue<node, vector<node> > q; bool operator < (const node &s1, const node &s2) { if(s1.t != s2.t) return s1.t > s2.t; e ...

Posted on Thu, 13 Feb 2020 09:47:54 -0800 by filn

OJ exercise on February 13, 2020 [priority queue]

First, let's distinguish between priority queues and queues Definition : priority_queue<type,vector,less(greater) >q; (note that the last two > should have spaces in between, otherwise the compiler might think it's a right shift.) Among them, type can make int, long long, etc., but it is gen ...

Posted on Wed, 12 Feb 2020 23:19:01 -0800 by Reformed