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Lhe é dado uma lista (array) com números positivos e um número N. Você deve encontrar a N-ésima potência do elemento na lista no indice N. Se N esta fora da lista, retorne -1. Não se esqueça que o primeiro elemento possui indice 0.

Vejamos...
- lista = [1, 2, 3, 4] e N = 2, o resultado será 3
- lista = [1, 2, 3] e N = 3, mas N está fora da lista, então o resultado será -1.

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