Problem Statement
Find index where target should be inserted in sorted array.
Approach
Binary search. If not found, left pointer is insertion position.
Time & Space Complexity
Time O(log n), Space O(1).

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Binary search variant for finding insertion point.
Find index where target should be inserted in sorted array.
Binary search. If not found, left pointer is insertion position.
Time O(log n), Space O(1).
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