study: sorting algorithm

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Author: gogumaC

src/sortingAlgorithms/1_bubble_sort.py

@@ -0,0 +1,9 @@
+def bubble_sort(arr):
+    for i in range(len(arr)):
+        for j in range(len(arr)-i-1):
+            if arr[j]>arr[j+1]:
+                arr[j],arr[j+1]=arr[j+1],arr[j]
+    print(arr)
+
+arr = [64, 34, 25, 12, 22, 11, 90]
+bubble_sort(arr)

src/sortingAlgorithms/2_selection_sort.py

@@ -0,0 +1,12 @@
+def selection_sort(arr):
+    n=len(arr)
+    for i in range(n):
+        min_idx=i
+        for j in range(i,n):
+            if arr[j]<arr[min_idx]:
+                min_idx=j
+        arr[i],arr[min_idx]=arr[min_idx],arr[i]
+    print(arr)
+
+arr = [29, 10, 14, 37, 13]
+selection_sort(arr)

src/sortingAlgorithms/3_insertion_sort.py

@@ -0,0 +1,14 @@
+def insertion_sort(arr):
+    n=len(arr)
+    for i in range(n):
+        current=arr[i]
+        j=i-1
+        while j>=0 and arr[j]>current:
+            arr[j+1]=arr[j]
+            j-=1
+        arr[j+1]=current
+            
+    print(arr)
+
+arr = [12, 11, 13, 5, 6]
+insertion_sort(arr)

src/sortingAlgorithms/4_merge_sort.py

@@ -0,0 +1,36 @@
+def merge_sort(arr):
+    if len(arr)<=1:
+        return arr
+    mid=len(arr)//2
+
+    left=merge_sort(arr[:mid])
+    right=merge_sort(arr[mid:])
+
+    return merge(left,right)
+
+def merge(left,right):
+
+    i=j=0
+    merged=[]
+    while i<len(left) and j<len(right):
+        if left[i]<right[j]:
+            merged.append(left[i])
+            i+=1
+        else:
+            merged.append(right[j])
+            j+=1
+    
+    merged.extend(left[i:])
+    merged.extend(right[j:])
+
+    return merged
+    
+
+arr = [38, 27, 43, 3, 9, 82, 10]
+sorted_arr=merge_sort(arr)
+print(sorted_arr)
+
+
+
+        
+

src/sortingAlgorithms/5_quick_sort.py

@@ -0,0 +1,26 @@
+def quick_sort(low,high,arr):
+    if high-low+1==1:
+        return
+    mid=low+(high-low)//2
+    pivot=arr[mid]
+    left=low
+    right=high
+
+    while left!=right:
+        while arr[right]>pivot:
+            right-=1
+        
+        while arr[left]<pivot:
+            left+=1
+        if arr[left]>arr[right]:
+            arr[right],arr[left]=arr[left],arr[right]
+
+    if right-1>low: quick_sort(low,right-1,arr)
+    if right+1<high: quick_sort(right+1,high,arr)
+
+
+arr = [10, 7, 8, 9, 1, 5]
+quick_sort(0,len(arr)-1,arr)
+print(arr)
+
+