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function replaceElements(arr){  let len = arr.length;  let max = 0;  for(let i = 0; i < len-1; i++){    for(let j = i+1; j < len; j++){      max = max > arr[j] ? max : arr[j];    }    arr[i] = max;    max = 0;  }  arr[len-1] = -1;  return arr;}var arr = [17,18,5,4,6,1]

function relativeSortArray(arr1, arr2){  let len1 = arr1.length;  let len2 = arr2.length;  let arr = [];  let arr0 = [];  let count = 1;  for(let i = 0; i < len2; i++){    for(let j = 0; j < len1; j++){      if(arr2[i] == arr1[j]){        arr.push(arr2[i]);      }    }  }  arr0 = arr1.filter(el => !arr2.includes(el));  arr0.sort((a,b) => a - b);  arr = arr.concat(arr0);  return arr;}var arr1 = [2,3,1,3,2,4,6,7,9,2,19];var arr2 = [2,1,4,3,9,6];

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