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Document directory Problem description Basic Ideas Optimize space complexity Initialization details Problem description Conversion to 0-1 backpack Further Optimization-O (CN) Solution This article mainly comes from the nine lectures on

Case: The final exam results of a class of students, Chinese, maths, English are stored in 3 lists, while iterating over three lists. To calculate the total score (in parallel) for each student There are 4 classes in a certain grade,

Code:1 #x= ' Hello '2 ## Print (dir (x))3 #iter_test=x.__iter__ ()4 #5 ## Print (iter_test)6 #print (iter_test.__next__ ())7 #print (iter_test.__next__ ())8 #print (iter_test.__next__ ())9 #print (iter_test.__next__ ())Ten #print (iter_test.__next__

# first time, find the maximum valuen=[3,5,1,6,2]For I in range (len (n)-1):If N[I]>N[I+1]:N[i],n[i+1]=n[i+1],n[i]Print (N[-1])# Second, find the second largest value, put it in the penultimate position.n=[3,1,5,2,6]For I in range (len (n)-1-1):If N[

Iterators and generators 1, list-generated List Generation List Comprehensions is a built-in, Python very simple but powerful build that you can use to create list .For example, to generate list [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] can be used

Python Multithreading-thread Threading queue-Simple LearningIn the actual work process, there will be a need to do something concurrency, such as a machine to measure the network connectivity of thousands of machines, if you single-threaded one to

This article is mainly about exploring the sharing of variables between Python's multiple-process programming threads, and multi-process programming is an important knowledge in Python's advanced learning, and friends who need it can refer to 1,

two ways to call a library name Import Turtle from Turtle Import * 1.9*9 Multiplication Formula PS: Note that indentation can not be changed, {: 2} ': ' Before no space meaning for the result to retain two-bit valid bit end= ' and no space can be

Lambda functions Python supports an interesting syntax that allows you to quickly define the smallest function of a single line. These functions, called Lambda, are borrowed from Lisp and can be used wherever a function is needed. def f (x):

Directory:1 Control structure ...1.1 Branch Statement ...1.1.1 Nesting of If statements ...1.2 For Loop ...1.2.1 Control statements in the Python loop ...1.3 While loop statement ...1.3.1 Example ...1 Control structurePython support for three

Yesterday's content reviewObjects that can be iterated:An internally contained __iter__ method is an iterative object.An iterative object cannot be evaluated because the __next__ method is not included internally.you can iterate over objects--->

First, introduceDefinition: In CPython, the global interpreter lock, or GIL, was a mutex that prevents multiple native threads from executing Python Bytecodes at once. This lock is necessary mainly because CPython ' s memory management are not

Yang Hui TriangleSome of the understanding:The sense that the Yang Hui Triangle is implemented at least in the first two lines is special. In the next few lines of code, I think, I can use the nth item to add n+1. Plus 1 on both sides. If both sides

One, what is multithreading?A process is simply used to bring resources together (a process is just a resource unit, or a collection of resources), and the thread is the executing unit on the CPU.Multithreading: Refers to the existence of multiple

1. The script is as follows(1) Inverted triangular format, note the space before the lineFor I in Range (1,10):For j in Range (i,10):Print ("%d*%d=%d"% (i,j,i*j), end= "")Print ("")(2) Rectangular formatFor I in Range (1,10):For j in Range

Python decorator learned a few, more difficult to understand, close-up this blog analysis of the principles and examples of adorners:First, the concept of adornersThe Python adorner is a function that expands the function of the decorated function

Complexity of TimeThe time complexity of the algorithm is a function, it quantitatively describes the algorithm's running time, time complexity commonly used "O" expression, when using this method, the time complexity can be called asymptotic, it

Monologue:　　First Contact algorithm sequencing, full of curiosity and eager to understand the principles, today we first learned three kinds of sorting methods, namely bubble sort, select sort, insert sort. After learning that math knowledge is

The first step is to define the convolution kernel class:Class Filter (object): # Filter Class initializes the convolution core def __init__ (self,width,height,depth): # Initialize the filter Parameter

Http://codeforces.com/contest/538A. Cutting Banner S=raw_input () flag = 0 for i in range (len (s)): for J in range (I, Len (s)): if (s[:i]+s[j+1:] = = ' Codeforces '): flag = 1 if (flag==1): print ' YES ' else: print