function countTriplets(arr, r) {
    const valuesAfterCurrent = new Map()
    arr.forEach((v) => {
        const count = valuesAfterCurrent.get(v) ? valuesAfterCurrent.get(v) + 1 : 1
        valuesAfterCurrent.set(v, count)
    }) //all here initially
    
    const valuesBeforeCurrent = new Map() //empty initially
    
    const res = arr.reduce((tripletsFound, currentValue) => {
        valuesAfterCurrent.set(currentValue, valuesAfterCurrent.get(currentValue) - 1)
        
        const frequencyOfFirstsOfTriple = valuesBeforeCurrent.get(currentValue / r) ?? 0
        const frequencyOfThirdsOfTriple = valuesAfterCurrent.get(currentValue * r) ?? 0
         
        const count = valuesBeforeCurrent.get(currentValue) ? valuesBeforeCurrent.get(currentValue) + 1 : 1
        valuesBeforeCurrent.set(currentValue, count)
        
        return tripletsFound + (frequencyOfFirstsOfTriple * frequencyOfThirdsOfTriple) //if any of the freq is zero it will not increase the current triplets found value
    }, 0) 
    
    return res
}