CodingBat index2D

index2D

Define a function that when passed a 2-dimensional ArrayList of Integers, and another int value, returns the index of the first sub-list in which the value exists, -1 if it doesn't in any of the sub-lists.

index2D([[10, 70], [20, 90]], 20) → 1
index2D([[10, 70], [20, 90]], 70) → 0
index2D([[10, 70], [20, 90]], 50) → -1

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