## Question:

Please help me to implement the receipt of a new list in which, instead of the original digits, the sum of all the digits to the right of the given number will be

## Answer:

Using additional memory

```
xs = [1, 2, 3, 4]
n = len(xs)
sums = [0] * n
for i in range(n - 1, 0, -1):
sums[i - 1] = sums[i] + xs[i]
print(sums)
```

And in place

```
xs = [1, 2, 3, 4]
n = len(xs)
last = xs[n - 1]
xs[n - 1] = 0
for i in range(n - 1, 0, -1):
tmp = xs[i - 1]
xs[i - 1] = xs[i] + last
last = tmp
print(xs)
```