import json
import os

def run_lc_sync(mode):
    # Your LeetCode logic here...
    output_filename = f"lc_{mode}_data.json"
    
    # Dummy data for example
    data = {"status": "success", "mode": mode, "problems": []}
    
    with open(output_filename, "w") as f:
        json.dump(data, f)
        
    return os.path.abspath(output_filename)