把堆首(最大值)和堆尾互换; 把堆的尺寸缩小 1,并调用 shift_down(0),目的是把新的数组顶端数据调整到相应位置; 重复步骤 2,直到堆的尺寸为 1。 2. 动图演示 3. Python 代码实现 代码语言:javascript 代码运行次数:0 运行 AI代码解释 defbuildMaxHeap(arr):importmathforiinrange(math.floor(len(arr)/...
把堆首(最大值)和堆尾互换; 把堆的尺寸缩小 1,并调用 shift_down(0),目的是把新的数组顶端数据调整到相应位置; 重复步骤 2,直到堆的尺寸为 1。 2. 动图演示 3. Python 代码 defbuildMaxHeap(arr):importmathforiinrange(math.floor(len(arr)/2),-1,-1):heapify(arr,i)defheapify(arr,i):left=...
efcountingSort(arr, maxValue):bucketLen = maxValue+1bucket = [0]*bucketLensortedIndex =0arrLen = len(arr)for i in range(arrLen):if not bucket[arr[i]]:bucket[arr[i]]=0bucket[arr[i]]+=1for j in range(bucketLen):while bucket[j]>0:arr...
1. Windows 环境 打开 Cmd (开始-运行-CMD)。2. MacOS 环境 打开 Terminal (command+空格输入Terminal...
def wrapper_repeat(*args, **kwargs): for _ in range(num_times): value = func(*args, **kwargs) return value This wrapper_repeat() function takes arbitrary arguments and returns the value of the decorated function, func(). This wrapper function also contains the loop that calls the decor...
for c in word: d[c] = d.get(c,0) + 1 print(d) The use of thegetmethod to simplify this counting loop ends up being a very commonly used “idiom” in Python and we will use it many times in the rest of the book. So you should take a moment and compare the loop using the...
Note that the range() function's count starts from 0 and not from 1. That means that, in the above example, the count should be like 0,1,2 and not 1,2,3. That's how number counting in a computer's memory works. So, while designing a for loop, always keep in mind that you ...
Instead of creating the index as a loop variable, use the enumerate() function. The function will return the tuple (index, element). Make sure that the index starts counting at zero. names = ["Jim", "Jack", "John"] for index, name in enumerate(names): print(f"{index + 1}. {...
def countingSort(arr, maxValue):bucketLen= maxValue+1bucket= [0]*bucketLensortedIndex =0arrLen = len(arr) for i in range(arrLen): if notbucket[arr[i]]:bucket[arr[i]]=0bucket[arr[i]]+=1forjin range(bucketLen):whilebucket[j]>0:arr[sortedIndex] =jsortedIndex+=1bucket[j]-=1retu...
In the case of the for loop, the code is actually telling Python to do the following: • Start counting from 0 and stop before reaching 5. • For each number we count, store the value in the variable x. Then Python executes the block of code You don’t need to stick to using...