Available question text
Given four unordered 2D points, determine whether they form a valid square (four equal non-zero side lengths and four right angles). A common check is to analyze pairwise squared distances — there should be exactly two distinct distances with a 4:2 frequency ratio corresponding to equal sides and equal diagonals.
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Leetcode 593. Valid Square
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Source snapshot: Nov 12, 2026
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Pure Storage
Valid Square
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Source snapshot: Oct 20, 2026
Source frequency score: 100. This is not an interview probability.
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