实现加权轮询负载均衡

def solve():
    from pyodide.http import open_url
    from io import StringIO
    import pandas as pd
    reg_csv = open_url(____).read()
    reg = pd.read_csv(StringIO(____))
    healthy_di = reg[(____)&(____)]
    def weighted_round_robin(____):
        pool = []
        for _, row in instances.iterrows():
            pool.extend([row['____']]*int(____))
        selected = [pool[i % len(____)] for i in range(____)]
        from collections import Counter
        return Counter(____)
    counts = weighted_round_robin(____)
    print(____)
    for inst, cnt in sorted(counts.items()):
        w = healthy_di[healthy_di['____']==inst].iloc[____]['____']
        print(____)