If $x_i$ is an integer greater than 1, let $f(x_i)$ be the greatest prime factor of $x_i,x_{i+1} =x_i-f(x_i)$ ($i\ge 0$ and i is an integer).
(1) Prove that for any integer $x_0$ greater than 1, there exists a natural number$k(x_0)$, such that $x_{k(x_0)+1}=0$
Grade 10: (2) Let $V_{(x_0)}$  be the number of different numbers in $f(x_0),f(x_1),\cdots,f(x_{k(x_0)})$. Find the largest number in  $V(2),V(3),\cdots,V(781)$ and give reasons.
Note: Bai Lu Zhou Academy was founded in 1241 and has a history of 781 years.
Grade 11: (2) Let $V_{(x_0)}$  be the number of different numbers in $f(x_0),f(x_1),\cdots,f(x_{k(x_0)})$. Find the largest number in  $V(2),V(3),\cdots,V(2022)$ and give reasons.
1. **Prove that for any integer \( x_0 \) greater than 1, there exists a natural number \( k(x_0) \), such that \( x_{k(x_0)+1} = 0 \):**

   Let \( x_i \) be an integer greater than 1. Define \( f(x_i) \) as the greatest prime factor of \( x_i \). We construct a sequence \( \{x_i\} \) where \( x_{i+1} = x_i - f(x_i) \).

   - **Step 1:** Show that \( x_i \) strictly decreases.
     Since \( f(x_i) \) is the greatest prime factor of \( x_i \), it follows that \( f(x_i) \geq 2 \). Therefore, \( x_{i+1} = x_i - f(x_i) \leq x_i - 2 \). This implies that \( x_i \) strictly decreases.

   - **Step 2:** Show that the sequence terminates at 0.
     Since \( x_i \) is strictly decreasing and always positive, it must eventually reach a value where \( x_i = f(x_i) \). At this point, \( x_{i+1} = x_i - f(x_i) = 0 \). Therefore, there exists a natural number \( k(x_0) \) such that \( x_{k(x_0)+1} = 0 \).

   Hence, we have proven that for any integer \( x_0 \) greater than 1, there exists a natural number \( k(x_0) \) such that \( x_{k(x_0)+1} = 0 \).

2. **Find the largest number in \( V(2), V(3), \cdots, V(781) \) and give reasons:**

   Let \( V(x_0) \) be the number of different numbers in \( f(x_0), f(x_1), \cdots, f(x_{k(x_0)}) \).

   - **Step 1:** Understand the behavior of \( f(x_i) \).
     Since \( f(x_i) \) is the greatest prime factor of \( x_i \), and \( x_i \) strictly decreases, the sequence of greatest prime factors \( f(x_i) \) is non-decreasing.

   - **Step 2:** Determine the maximum number of distinct prime factors.
     The maximum number of distinct prime factors in the sequence \( f(x_0), f(x_1), \cdots, f(x_{k(x_0)}) \) is determined by the largest \( x_0 \) in the range 2 to 781. The number 781 has the prime factorization \( 781 = 11 \times 71 \). Therefore, the largest number of distinct prime factors in this range is the number of distinct prime factors of 781, which is 2.

   Therefore, the largest number in \( V(2), V(3), \cdots, V(781) \) is 2.

The final answer is \( \boxed{ 2 } \).