Let $n$ be a positive integer. There are $n$ soldiers stationed on the $n$th root of unity in the complex plane. Each round, you pick a point, and all the soldiers shoot in a straight line towards that point; if their shot hits another soldier, the hit soldier dies and no longer shoots during the next round. What is the minimum number of rounds, in terms of $n$, required to eliminate all the soldiers?

[i]David Yang.[/i]
To solve this problem, we need to determine the minimum number of rounds required to eliminate all $n$ soldiers stationed on the $n$th roots of unity in the complex plane. 

1. **Understanding the $n$th roots of unity:**
   The $n$th roots of unity are the complex numbers that satisfy the equation $z^n = 1$. These roots are given by:
   \[
   z_k = e^{2\pi i k / n} \quad \text{for} \quad k = 0, 1, 2, \ldots, n-1
   \]
   These points are evenly spaced on the unit circle in the complex plane.

2. **Choosing a point to shoot at:**
   When we pick a point in the complex plane, each soldier will shoot a straight line towards that point. If a soldier's shot hits another soldier, the hit soldier dies and will not shoot in the next round.

3. **Strategy to eliminate soldiers:**
   To minimize the number of rounds, we need to choose points such that the maximum number of soldiers are hit in each round. One effective strategy is to choose points that lie on the lines connecting pairs of soldiers.

4. **Example for $n = 3$:**
   For $n = 3$, the soldiers are located at the points:
   \[
   1, \quad e^{2\pi i / 3}, \quad e^{4\pi i / 3}
   \]
   These points correspond to:
   \[
   1, \quad -\frac{1}{2} + i\frac{\sqrt{3}}{2}, \quad -\frac{1}{2} - i\frac{\sqrt{3}}{2}
   \]
   If we pick the point $-1/2 + i$, the soldier at $-1/2 + i\sqrt{3}/2$ will be hit. This leaves the soldiers at $1$ and $-1/2 - i\sqrt{3}/2$.

5. **Generalizing the strategy:**
   For a general $n$, we can use a similar approach. By choosing points that lie on the lines connecting pairs of soldiers, we can ensure that each round eliminates a significant number of soldiers. 

6. **Minimum number of rounds:**
   To eliminate all $n$ soldiers, we need to ensure that each round maximizes the number of soldiers hit. Since each round can potentially eliminate up to half of the remaining soldiers, the minimum number of rounds required is approximately $\log_2(n)$. However, since we cannot have a fraction of a round, we take the ceiling of this value:
   \[
   \lceil \log_2(n) \rceil
   \]

The final answer is $\boxed{\lceil \log_2(n) \rceil}$