Which of the following modifications can be made to binary search to find the fi

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Question: Which of the following modifications can be made to binary search to find the first occurrence of a target value?

Options:

Correct Answer: Continue searching left after finding the target

Solution:

To find the first occurrence, continue searching to the left even after finding the target value.

Which of the following modifications can be made to binary search to find the first occurrence of a target value?

Which of the following modifications can be made to binary search to find the first occurrence of a target value?

Step 1: Start with the usual binary search setup. Define your low and high pointers to the start and end of the array.
Step 2: Calculate the middle index by using the formula: mid = (low + high) / 2.
Step 3: Check if the value at the middle index is equal to the target value.
Step 4: If it is equal, do not return immediately. Instead, continue searching to the left by setting high = mid - 1.
Step 5: If the value at the middle index is less than the target, move the low pointer to mid + 1.
Step 6: If the value at the middle index is greater than the target, move the high pointer to mid - 1.
Step 7: Repeat steps 2 to 6 until low is greater than high.
Step 8: If you find the target, keep track of its index, but continue searching to the left to find the first occurrence.
Step 9: Once the search is complete, return the index of the first occurrence of the target value.

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