Untitled

arr1 = []
arr2 = []

for (let i = 0; i < 9; i++) {
    arr1.push([Math.floor(Math.random()*25), i])
    arr2.push([Math.floor(Math.random()*25), i])
}

arr = []

for (let i = 0; i < 9; i++) {
    arr.push([Math.floor((arr1[i][0] - arr2[i][0]) / 2), i])
}

arr.sort((a, b) => a[0] - b[0])

console.log(arr1)
console.log(arr2)
console.log(arr)

let lPointer = 0;
let rPointer = arr.length - 1;

while (arr[lPointer] < 0 && arr[rPointer] > 0) {
    
}