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Determine if a set of equations like "a==b" and "a!=b" over single-letter variables is satisfiable by grouping variables connected by equalities (e.g., with union-find) and checking that no inequality relates variables in the same group. There are at most 26 lowercase variables and up to 500 equations.
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Amazon
Leetcode 990. Satisfiability of Equality Equations
Interview reported: Jul 29, 2026 · 2 source reports
JUNIOR, MID_LEVEL
Source snapshot: Nov 12, 2026
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