Sure, I can help you generate a test case generator for the given problem statement.

### Problem Statement: Set: Range Search

**Test Case Generator:**

```python
import random

def tcgen():
    # Number of queries
    q = random.randint(1, 200000)

    # Initialize the set to keep track of inserted values
    current_set = set()

    queries = []
    
    for _ in range(q):
        operation_type = random.randint(0, 3)
        
        if operation_type == 0:
            # insert operation (0 x)
            x = random.randint(0, 1000000000)
            current_set.add(x)  # we can keep track of the current set for later operations
            queries.append(f"0 {x}")
        elif operation_type == 1:
            # find operation (1 x)
            x = random.randint(0, 1000000000)
            queries.append(f"1 {x}")
        elif operation_type == 2:
            # delete operation (2 x)
            if current_set:
                x = random.choice(list(current_set))
                current_set.remove(x)
            else:
                x = random.randint(0, 1000000000)
            queries.append(f"2 {x}")
        else:
            # dump operation (3 L R)
            if current_set:
                L = random.randint(0, min(current_set))
                R = random.randint(max(current_set), 1000000000)
            else:
                L = random.randint(0, 1000000000)
                R = random.randint(L, 1000000000)
            queries.append(f"3 {L} {R}")

    return q, queries

# Example of generating a test case
q, queries = tcgen()
print(q)
for query in queries:
    print(query)
```

### Explanation:

1. **`q`**: Randomly generate the number of queries between 1 and 200,000.
2. **`queries`**: Generate each query based on the randomly chosen operation type:
    - **Insert (0 x)**: Insert a random value `x` (0 ≤ `x` ≤ 1,000,000,000) to the set and keep track of the inserted values.
    - **Find (1 x)**: Check if a random value `x` (0 ≤ `x` ≤ 1,000,000,000) is in the set.
    - **Delete (2 x)**: Remove a value `x` from the set. If the set is not empty, pick a value from the set, otherwise, pick a random value.
    - **Dump (3 L R)**: Print all elements in the set within the range `[L, R]`. If the set is not empty, choose `L` from the minimum value in the set and `R` from the maximum value in the set, otherwise, choose random values.

This generator ensures that the constraints and conditions of the problem statement are respected while generating diverse and comprehensive test cases.