var lastRemaining = function(n, m) {
    let arr = []
    let head = 0
    for (let i = 0; i < n; i++) arr.push(i)
    while(arr.length > 1) {
        head = (head + m - 1) % arr.length
        arr.splice(head, 1)
    }
   return arr[0] 
};