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// count the unique values in an array using the multiple-pointers pattern as shown
// the course JS Algorithms and Data Structures by Colt Steele on Udemy
function countUniqueValues(arr){
    let i = 0
    let j = 1;
    while(j < arr.length){
        if(arr[i] < arr[j]) arr[++i] = arr[j];
        j++;
    }
    if (i === 0) return 0; 
    else return ++i; 
}