Binary Search Recursive Approach in DSA Go - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to calculate the middle index in the recursive binary search.

DSA Go

mid := low + ([1] - low) / 2

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Ahigh

Blen(arr)

Cmid

Dlow

Attempts:

3 left

💡 Hint

Common Mistakes

Using low instead of high causes incorrect middle calculation.

Using length of array instead of high index.

The middle index is calculated as low plus half the distance between high and low.

2fill in blank

medium

Complete the code to check if the middle element is equal to the target value.

DSA Go

if arr[mid] == [1] {

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Amid

Blow

Chigh

Dtarget

Attempts:

3 left

💡 Hint

Common Mistakes

Comparing with index instead of target value.

Using low or high instead of target.

We compare the middle element with the target value to find a match.

3fill in blank

hard

Fix the error in the recursive call when the target is less than the middle element.

DSA Go

return binarySearch(arr, low, [1], target)

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Ahigh

Bmid + 1

Cmid - 1

Dlow

Attempts:

3 left

💡 Hint

Common Mistakes

Using mid + 1 searches the right half incorrectly.

Using low or high without adjustment causes infinite recursion.

When target is less than middle element, search left half by setting high to mid - 1.

4fill in blank

hard

Fill both blanks to correctly call the recursive function when the target is greater than the middle element.

DSA Go

return binarySearch(arr, [1], [2], target)

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Amid + 1

Bmid - 1

Chigh

Dlow

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping low and high values.

Using mid - 1 instead of mid + 1 for low.

When target is greater, search right half by setting low to mid + 1 and keeping high same.

5fill in blank

hard

Fill all three blanks to complete the base case that stops recursion when the target is not found.

DSA Go

if [1] > [2] {
    return [3]
}

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Alow

Bhigh

C-1

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Returning 0 instead of -1.

Checking if high > low instead of low > high.

If low is greater than high, target is not in array, so return -1.