Question

How to move all negative elements to the end of list in Python

Answer 1

def move_negative_to_end(lst):
    j = 0
    for i in range(len(lst)):
        if lst[i] >= 0:
            lst[i], lst[j] = lst[j], lst[i]
            j += 1
    return lst
  
 
lst = [-1, 8, -21, -3, -2, 7, 15, -30, -40, 3, 6, 9]
 
print(move_negative_to_end(lst))
 
 
 
'''
run:
 
[8, 7, 15, 3, 6, 9, -21, -30, -40, -3, -2, -1]
 
'''

 

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Answer 2

def move_negative_to_end(arr): 
    size = len(lst)
    temp = [0 for k in range(size)] 

    j = 0 
    for i in range(size): 
        if (arr[i] >= 0 ): 
            temp[j] = arr[i] 
            j +=1
   
    if (j == size or j == 0): 
        return
   
    for i in range(size): 
        if (arr[i] < 0): 
            temp[j] = arr[i] 
            j +=1
   
    for k in range(size): 
        arr[k] = temp[k] 

  
lst = [-1, 8, -21, -3, -2, 7, 15, -30, -40, 3, 6, 9] 

move_negative_to_end(lst)
 
print(lst)   


 
 
'''
run:
 
[8, 7, 15, 3, 6, 9, -1, -21, -3, -2, -30, -40]
 
'''

 

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