Codility: PermMissingElem Solution

Lesson 3 Complexity

1function solution(A) {
2  const pivot = A.length + 1
3  const fullSum = ((pivot + 1) * pivot) / 2
4  const sum = A.reduce((acc, el) => acc + el, 0)
5  return fullSum - sum
6}

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Codility: PermMissingElem Solution

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