function countTriplets(arr, r) {
    let result = 0
    const left = new Map(), right = new Map()
    
    arr.forEach((elem) => {
        const tmp = right.get(elem) || 0
        right.set(elem, tmp+1)
    })
    arr.forEach((elem) => {
        if (right.has(elem)) right.set(elem, right.get(elem) - 1)
        const c1 = right.get(elem * r) || 0
        const c2 = left.get(elem / r) || 0
        result += c1 * c2
        left.set(elem, (left.get(elem) || 0) + 1)
    })
    return result
}