Codility: FrogRiverOne Solution

Lesson 4 Counting Elements
1function solution(X, A) {
2 const set = new Set()
3 for (const [i, a] of A.entries()) {
4 set.add(a)
5 if (set.size === X) {
6 return i
7 }
8 }
9 return -1
10}

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