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DSA Pythonprogramming~10 mins

Sort Colors Two Pointer Dutch Flag in DSA Python - Interactive Practice

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Practice - 5 Tasks
Answer the questions below
1fill in blank
easy

Complete the code to initialize the left pointer at the start of the list.

DSA Python
left = [1]
Drag options to blanks, or click blank then click option'
A1
B0
C-1
Dlen(nums)
Attempts:
3 left
💡 Hint
Common Mistakes
Starting left pointer at 1 or -1 causes skipping the first element.
2fill in blank
medium

Complete the code to initialize the right pointer at the end of the list.

DSA Python
right = [1]
Drag options to blanks, or click blank then click option'
A0
B-1
Clen(nums) - 1
Dlen(nums)
Attempts:
3 left
💡 Hint
Common Mistakes
Using len(nums) causes index out of range errors.
3fill in blank
hard

Fix the error in the while loop condition to continue sorting while pointers do not cross.

DSA Python
while [1] <= right:
Drag options to blanks, or click blank then click option'
Anums
Bleft
Cright
Di
Attempts:
3 left
💡 Hint
Common Mistakes
Using 'left' instead of 'i' causes logic errors.
4fill in blank
hard

Fill both blanks to swap elements and move the left pointer forward.

DSA Python
nums[[1]], nums[[2]] = nums[[2]], nums[[1]]
left += 1
Drag options to blanks, or click blank then click option'
Ai
Bleft
Cright
D0
Attempts:
3 left
💡 Hint
Common Mistakes
Swapping with 'right' instead of 'left' causes wrong sorting.
5fill in blank
hard

Fill both blanks to swap elements, move the right pointer backward, and continue without incrementing i.

DSA Python
nums[[1]], nums[[2]] = nums[[2]], nums[[1]]
right -= 1
continue
Drag options to blanks, or click blank then click option'
Ai
Bleft
Cright
D0
Attempts:
3 left
💡 Hint
Common Mistakes
Incrementing 'i' after swapping with 'right' causes missed checks.