Let $n \geq 2$ be a natural number, and let $\left( a_{1};\;a_{2};\;...;\;a_{n}\right)$ be a permutation of $\left(1;\;2;\;...;\;n\right)$. For any integer $k$ with $1 \leq k \leq n$, we place $a_k$ raisins on the position $k$ of the real number axis. [The real number axis is the $x$-axis of a Cartesian coordinate system.]

Now, we place three children A, B, C on the positions $x_A$, $x_B$, $x_C$, each of the numbers $x_A$, $x_B$, $x_C$ being an element of $\left\{1;\;2;\;...;\;n\right\}$. [It is not forbidden to place different children on the same place!]

For any $k$, the $a_k$ raisins placed on the position $k$ are equally handed out to those children whose positions are next to $k$. [So, if there is only one child lying next to $k$, then he gets the raisin. If there are two children lying next to $k$ (either both on the same position or symmetric with respect to $k$), then each of them gets one half of the raisin. Etc..]

After all raisins are distributed, a child is unhappy if he could have received more raisins than he actually has received if he had moved to another place (while the other children would rest on their places).

For which $n$ does there exist a configuration $\left( a_{1};\;a_{2};\;...;\;a_{n}\right)$ and numbers $x_A$, $x_B$, $x_C$, such that all three children are happy?
To solve this problem, we need to determine for which values of \( n \) there exists a configuration of raisins and positions such that all three children are happy. We will analyze different configurations and use inequalities to show that for \( n \geq 9 \), at least one child will inevitably be unhappy.

1. **Case 1: All children on the same position**

   If all three children are on the same position, they will share the raisins equally. The total number of raisins is the sum of the first \( n \) natural numbers:
   \[
   \text{Total raisins} = \frac{n(n+1)}{2}
   \]
   Each child gets:
   \[
   \frac{n(n+1)}{6}
   \]
   If one child moves one space to the left or right, they will be the only child next to some positions and will get all the raisins from those positions. The number of raisins they can get by moving is at least half of the remaining raisins:
   \[
   \frac{n(n-1)}{4}
   \]
   For \( n \geq 9 \):
   \[
   \frac{n(n-1)}{4} > \frac{n(n+1)}{6}
   \]
   Simplifying:
   \[
   3n(n-1) > 2n(n+1)
   \]
   \[
   3n^2 - 3n > 2n^2 + 2n
   \]
   \[
   n^2 > 5n
   \]
   This inequality holds for \( n \geq 9 \), so one child will be unhappy.

2. **Case 2: All children on separate positions**

   If all children are on separate positions, consider the middle child. The middle child will have at most \( n \) raisins. By moving to one side, the child can get at least half of the remaining raisins:
   \[
   \frac{(n-3)(n-2)}{4}
   \]
   For \( n \geq 9 \):
   \[
   \frac{(n-3)(n-2)}{4} > n
   \]
   Simplifying:
   \[
   (n-3)(n-2) > 4n
   \]
   \[
   n^2 - 5n + 6 > 4n
   \]
   \[
   n^2 - 9n + 6 > 0
   \]
   This inequality holds for \( n \geq 9 \), so the middle child will be unhappy.

3. **Case 3: Two children on one position and one child on another**

   Suppose two children are on one position and one child is on an adjacent position. The lonely child will have at least:
   \[
   \frac{n(n-1)}{4}
   \]
   The two children will share the remaining raisins. If the two children move to the left, they will gain more raisins. Let \( x \) be the number of raisins strictly to the left of the two children. They have at most:
   \[
   \frac{x+n}{2}
   \]
   For the two children to be happy:
   \[
   x \leq n
   \]
   The minimal number of raisins strictly to the right of the lonely child occurs when \( x = n \). The two children have at most \( n \) each. For \( n \geq 9 \):
   \[
   n^2 + 2 \geq 7n
   \]
   This inequality holds for \( n \geq 9 \), so the pair would gain by moving, and thus be unhappy.

Therefore, for \( n \geq 9 \), at least one child will inevitably be unhappy. For \( 2 \leq n \leq 8 \), specific configurations can be constructed where all three children are happy.

The final answer is \( \boxed{ 2 \leq n \leq 8 } \)