P-der
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P-der
```javascript function countOne(n) { if(n == 0) { return 0 } if(n 1) { return length*10 + countOne(rest) + countOne(10**length-1)*(first-1) } } ```
```javascript function handle(oldArr) { var newArr = [oldArr[oldArr.length-1]] var flag = true for(let i = oldArr.length-2;i>=0;i--){ var a = newArr.pop() newArr.unshift(a) newArr.unshift(oldArr[i]) } return newArr } let arr = [1,2,3,4,5,6,7,8,9,10,11,12,13]...