import random
from typing import List, Dict, Any

def generate_knapsack_case(num_items: int = 10, max_weight: int = 50, max_value: int = 100, capacity_ratio: float = 0.5) -> Dict[str, Any]:
    """
    Generates a case for 0/1 Knapsack.
    """
    items = []
    total_weight = 0
    for i in range(num_items):
        w = random.randint(1, max_weight)
        v = random.randint(1, max_value)
        items.append({"id": i, "weight": w, "value": v})
        total_weight += w
    
    capacity = int(total_weight * capacity_ratio)
    
    return {
        "items": items,
        "capacity": capacity
    }