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const FrogRiverOne = {

solution: function(X, A) {

let completed = Array(X+1).fill(0)

for (i=0; i<A.length; i++) {

if (completed[A[i]] == 0) {

completed[A[i]] = 1

X--

}

if (X == 0) {

return i

}

return -1

}

result = FrogRiverOne.solution(3, [1, 2, 3])

console.log(`${result}, pass: ${result == 2}`)

result = FrogRiverOne.solution(3, [1, 3, 1, 3, 2, 1, 3])

console.log(`${result}, pass: ${result == 4}`)

result = FrogRiverOne.solution(2, [1, 1, 1])

console.log(`${result}, pass: ${result == -1}`)

result = FrogRiverOne.solution(5, [1, 3, 1, 4, 2, 3, 5, 4, 4, 5])

console.log(`${result}, pass: ${result == 6}`)

result = FrogRiverOne.solution(3, [1, 3, 1, 2, 3])

console.log(`${result}, pass: ${result == 3}`)

result = FrogRiverOne.solution(3, [1, 3])

console.log(`${result}, pass: ${result == -1}`)

result = FrogRiverOne.solution(1, [1])

console.log(`${result}, pass: ${result == 0}`)

result = FrogRiverOne.solution(5, [1, 3, 1, 4, 5, 2, 3, 2, 4, 4, 3, 5, 1, 3, ])

console.log(`${result}, pass: ${result == 5}`)

result = FrogRiverOne.solution(2, [1])

console.log(`${result}, pass: ${result == -1}`)

// TESTED AND PASSED ON Codility