Problem Statement
Find floor of square root of n.
Approach
Binary search on [1, n]. Check if mid² ≤ n.
Time & Space Complexity
Time O(log n), Space O(1).

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Binary search for integer square root.
Find floor of square root of n.
Binary search on [1, n]. Check if mid² ≤ n.
Time O(log n), Space O(1).
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