Determine all positive integers $n$ such that it is possible to fill the $n \times n$ table with numbers $1, 2$ and $-3$ so that the sum of the numbers in each row and each column is $0$.
To determine all positive integers \( n \) such that it is possible to fill the \( n \times n \) table with numbers \( 1, 2 \), and \( -3 \) so that the sum of the numbers in each row and each column is \( 0 \), we need to analyze the conditions under which this can be achieved.

1. **Case for \( n = 1 \) and \( n = 2 \):**
   - For \( n = 1 \), the table is \( 1 \times 1 \). The only possible entries are \( 1, 2, \) or \( -3 \), none of which sum to \( 0 \). Hence, it is impossible.
   - For \( n = 2 \), the table is \( 2 \times 2 \). The sum of each row and each column must be \( 0 \). However, the sum of two numbers from \( \{1, 2, -3\} \) cannot be \( 0 \). Hence, it is impossible.

2. **Case for \( n \geq 3 \):**
   - We need to find a set of \( n \) numbers from \( \{1, 2, -3\} \) that sum to \( 0 \). We can then fill the \( n \times n \) table by cyclically shifting these numbers.

3. **Subcase \( n \equiv 0 \pmod{3} \):**
   - If \( n \) is a multiple of 3, we can use the set \( \{1, 2, -3\} \) repeated \(\frac{n}{3}\) times. Each set sums to \( 0 \):
     \[
     1 + 2 - 3 = 0
     \]
   - Example for \( n = 3 \):
     \[
     \begin{array}{ccc}
     1 & 2 & -3 \\
     -3 & 1 & 2 \\
     2 & -3 & 1 \\
     \end{array}
     \]
   - Each row and column sums to \( 0 \).

4. **Subcase \( n \equiv 1 \pmod{3} \):**
   - If \( n \equiv 1 \pmod{3} \), we can use the set \( \{1, 1, 1, -3\} \) once and then use \( \{1, 2, -3\} \) repeated \(\frac{n-4}{3}\) times. Each set sums to \( 0 \):
     \[
     1 + 1 + 1 - 3 = 0
     \]
   - Example for \( n = 4 \):
     \[
     \begin{array}{cccc}
     1 & 1 & 1 & -3 \\
     -3 & 1 & 1 & 1 \\
     1 & -3 & 1 & 1 \\
     1 & 1 & -3 & 1 \\
     \end{array}
     \]
   - Each row and column sums to \( 0 \).

5. **Subcase \( n \equiv 2 \pmod{3} \):**
   - If \( n \equiv 2 \pmod{3} \), we can use the set \( \{2, 2, 2, -3, -3\} \) once and then use \( \{1, 2, -3\} \) repeated \(\frac{n-5}{3}\) times. Each set sums to \( 0 \):
     \[
     2 + 2 + 2 - 3 - 3 = 0
     \]
   - Example for \( n = 5 \):
     \[
     \begin{array}{ccccc}
     2 & 2 & 2 & -3 & -3 \\
     -3 & 2 & 2 & 2 & -3 \\
     -3 & -3 & 2 & 2 & 2 \\
     2 & -3 & -3 & 2 & 2 \\
     2 & 2 & -3 & -3 & 2 \\
     \end{array}
     \]
   - Each row and column sums to \( 0 \).

Thus, for \( n \geq 3 \), it is always possible to fill the \( n \times n \) table with numbers \( 1, 2, \) and \( -3 \) such that the sum of the numbers in each row and each column is \( 0 \).

The final answer is all integers \( \boxed{ n \geq 3 } \).