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Return the index of the last occurrence of a given number in an array. Return -1 if the number is not in the array.
X464: Arrays - Find the Last Number
Return the index of the last occurrence of a given number in an array. Return -1 if the number is not in the array.
Examples:
findTheLastNumber({3,3,4,4},4) -> 3
findTheLastNumber({3,3,4,4},5) -> -1
findTheLastNumber({3,3,3,3},3) -> 3
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