Question

Modify the list according to the following: append the smallest value at the end of the list when all numbers in the list are negative, append the largest value at the end of the list when all numbers are greater than or equal t。О. Leave the list untouched otherwise. Sample Inputs/Outputs: Example Call: list_min_max_same ([-1, -99,-81) Expected Result: -1,-99, -8,-99] Example input: list_min_max_same ([1,99,8]) Expected Result: [1,99,8,99 Example input: list_min_max_same ([-1,99,-81)

Answer 1

Answer:

The solution code is written in Python 3:

1. def modifyList(listNumber):
2.    posCount = 0
3.    negCount = 0
5.    for x in listNumber:
6.        if x > 0:
7.            posCount += 1
8.        else:
9.            negCount += 1
10.    
11.    if(posCount == len(listNumber)):
12.        listNumber.append(max(listNumber))
13.    
14.    if(negCount == len(listNumber)):
15.        listNumber.append(min(listNumber))
16.    
17.    print(listNumber)
19. modifyList([-1,-99,-81])
20. modifyList([1,99,8])
21. modifyList([-1,99,-81])

Explanation:

The key step to solve this problem is to define two variables, posCount and negCount, to track the number of positive value and negative value from the input list (Line 2 - 3).

To track the posCount and negCount, we can traverse through the for-loop and create if else statement to check if the current number x is bigger than 0 then increment posCount by 1 otherwise increment negCount (Line 5- 9).

If all number in the list are positive, the posCount should be equal to the length of the input list and the same rule is applied to negCount. If one of them happens, the listNumber will append either the maximum number (Line 11 -12) or append the minimum number (Line 14-15).

If both posCount and negCount are not equal to the list length, the block of code Line 11 -15 will be skipped.

At last we can print the listNumber (Line 17).

If we test our function using the three sets of input list, we shall get the following results:

[-1, -99, -81, -99]

[1, 99, 8, 99]

[-1, 99, -81]