Merge pull request hustcc#2 from LokiSharp/patch-1

Patch 1

Author: LokiSharp

1.bubbleSort.md

@@ -47,4 +47,16 @@ function bubbleSort(arr) {
     }
     return arr;
 }
-```
+```
+
+
+## 5. Python 代码实现
+
+```python
+def bubbleSort(arr):
+    for i in range(1, len(arr)):
+        for j in range(0, len(arr)-i):
+            if arr[j] > arr[j+1]:
+                arr[j], arr[j + 1] = arr[j + 1], arr[j]
+    return arr
+```

2.selectionSort.md

@@ -36,4 +36,15 @@ function selectionSort(arr) {
     }
     return arr;
 }
-```
+```
+
+## 4. Python 代码实现
+
+```python
+def selectionSort(arr):
+    for i in range(len(arr)-1):
+        for j in range(i+1, len(arr)):
+            if arr[j] < arr[i]:
+                arr[i], arr[j] = arr[j], arr[i]
+    return arr
+```

3.insertionSort.md

@@ -34,4 +34,18 @@ function insertionSort(arr) {
     }
     return arr;
 }
-```
+```
+
+## 4. Python 代码实现
+
+```python
+def insertionSort(arr):
+    for i in range(len(arr)):
+        preIndex = i-1
+        current = arr[i]
+        while preIndex >= 0 and arr[preIndex] > current:
+            arr[preIndex+1] = arr[preIndex]
+            preIndex-=1
+        arr[preIndex+1] = current
+    return arr
+'''

4.shellSort.md

@@ -40,4 +40,25 @@ function shellSort(arr) {
     }
     return arr;
 }
-```
+```
+
+## 3. Python 代码实现
+
+```python
+def shellSort(arr):
+    import math
+    gap=1
+    while(gap < len(arr)/3):
+        gap = gap*3+1
+    while gap > 0:
+        for i in range(gap,len(arr)):
+            temp = arr[i]
+            j = i-gap
+            while j >=0 and arr[j] > temp:
+                arr[j+gap]=arr[j]
+                j-=gap
+            arr[j+gap] = temp
+        gap = math.floor(gap/3)
+    return arr
+}
+```

5.mergeSort.md

@@ -70,4 +70,29 @@ function merge(left, right)
 
     return result;
 }
-```
+```
+
+## 5. Python 代码实现
+
+```python
+def mergeSort(arr):
+    import math
+    if(len(arr)<2):
+        return arr
+    middle = math.floor(len(arr)/2)
+    left, right = arr[0:middle], arr[middle:]
+    return merge(mergeSort(left), mergeSort(right))
+
+def merge(left,right):
+    result = []
+    while left and right:
+        if left[0] <= right[0]:
+            result.append(left.pop(0));
+        else:
+            result.append(right.pop(0));
+    while left:
+        result.append(left.pop(0));
+    while right:
+        result.append(right.pop(0));
+    return result
+```

6.quickSort.md

@@ -62,4 +62,33 @@ function swap(arr, i, j) {
     arr[i] = arr[j];
     arr[j] = temp;
 }
-```
+```
+
+
+## 4. Python 代码实现
+
+```python
+def quickSort(arr, left=None, right=None):
+    left = 0 if not isinstance(left,(int, float)) else left
+    right = len(arr)-1 if not isinstance(right,(int, float)) else right
+    if left < right:
+        partitionIndex = partition(arr, left, right)
+        quickSort(arr, left, partitionIndex-1)
+        quickSort(arr, partitionIndex+1, right)
+    return arr
+
+def partition(arr, left, right):
+    pivot = left
+    index = pivot+1
+    i = index
+    while  i <= right:
+        if arr[i] < arr[pivot]:
+            swap(arr, i, index)
+            index+=1
+        i+=1
+    swap(arr,pivot,index-1)
+    return index-1
+
+def swap(arr, i, j):
+    arr[i], arr[j] = arr[j], arr[i]
+```

7.heapSort.md

@@ -71,4 +71,38 @@ function heapSort(arr) {
     }
     return arr;
 }
-```
+```
+## 4. Python 代码实现
+
+```python
+def buildMaxHeap(arr):
+    import math
+    for i in range(math.floor(len(arr)/2),-1,-1):
+        heapify(arr,i)
+
+def heapify(arr, i):
+    left = 2*i+1
+    right = 2*i+2
+    largest = i
+    if left < arrLen and arr[left] > arr[largest]:
+        largest = left
+    if right < arrLen and arr[right] > arr[largest]:
+        largest = right
+
+    if largest != i:
+        swap(arr, i, largest)
+        heapify(arr, largest)
+
+def swap(arr, i, j):
+    arr[i], arr[j] = arr[j], arr[i]
+
+def heapSort(arr):
+    global arrLen
+    arrLen = len(arr)
+    buildMaxHeap(arr)
+    for i in range(len(arr)-1,0,-1):
+        swap(arr,0,i)
+        arrLen -=1
+        heapify(arr, 0)
+    return arr
+```

8.countingSort.md

@@ -32,4 +32,23 @@ function countingSort(arr, maxValue) {
 
     return arr;
 }
-```
+```
+## 3. JavaScript 代码实现
+
+```python
+def countingSort(arr, maxValue):
+    bucketLen = maxValue+1
+    bucket = [0]*bucketLen
+    sortedIndex =0
+    arrLen = len(arr)
+    for i in range(arrLen):
+        if not bucket[arr[i]]:
+            bucket[arr[i]]=0
+        bucket[arr[i]]+=1
+    for j in range(bucketLen):
+        while bucket[j]>0:
+            arr[sortedIndex] = j
+            sortedIndex+=1
+            bucket[j]-=1
+    return arr
+```