Problem Statement
Search for target in row-wise and column-wise sorted matrix.
Approach
Flatten index: row = mid/cols, col = mid%cols. Binary search.
Time & Space Complexity
Time O(log(m×n)), Space O(1).

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Treat 2D matrix as 1D sorted array for binary search.
Search for target in row-wise and column-wise sorted matrix.
Flatten index: row = mid/cols, col = mid%cols. Binary search.
Time O(log(m×n)), Space O(1).
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