🧠 Before you code — what pattern fits?
You are given equations like a / b = 2.0 as pairs [a, b] with values, and queries [c, d]. Return the answer for each query, or -1.0 if it cannot be determined.
equations [["a","b"],["b","c"]], values [2,3], query a/c → 6.0
🎬 Video explanation · NeetCodeIO
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