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中级

验证菜谱荤素搭配合理性

未完成
中级参考 代码结构已给出，请填写 ____ 处 
def solve():
    from pyodide.http import open_url
    from io import StringIO
    import pandas as pd
    items=pd.read_csv(StringIO(open_url(____).read()))
    dishes=pd.read_csv(StringIO(open_url(____).read()))
    merged=items.merge(____)
    def check_balance(____):
        veg=len(____); total=len(____)
        if total==____: return '____'
        veg_pct=veg/total
        if veg_pct<____: return '____'
        elif veg_pct>____: return '____'
        return '____'
    print(____)
    lunch=merged[merged['____']=='____']
    for (____),grp in lunch.groupby(____):
        result=check_balance(____)
        print(____)

示例

输入
solve()
期望输出
Meat-veg balance by meal slot (lunch, first 10):
  2026-03-02 lunch: 3 dishes (2 veg) -> [balanced]
  2026-03-03 lunch: 3 dishes (1 veg) -> [balanced]
  2026-03-04 lunch: 3 dishes (2 veg) -> [balanced]
  2026-03-05 lunch: 3 dishes (0 veg) -> [too_much_meat]
  2026-03-06 lunch: 3 dishes (2 veg) -> [balanced]
  2026-03-09 lunch: 3 dishes (1 veg) -> [balanced]
  2026-03-10 lunch: 3 dishes (1 veg) -> [balanced]
  2026-03-11 lunch: 3 dishes (2 veg) -> [balanced]
  2026-03-12 lunch: 3 dishes (2 veg) -> [balanced]
  2026-03-13 lunch: 3 dishes (0 veg) -> [too_much_meat]
  2026-03-16 lunch: 3 dishes (0 veg) -> [too_much_meat]
  2026-03-17 lunch: 3 dishes (2 veg) -> [balanced]
  2026-03-18 lunch: 3 dishes (1 veg) -> [balanced]
  2026-03-19 lunch: 3 dishes (1 veg) -> [balanced]
  2026-03-20 lunch: 3 dishes (0 veg) -> [too_much_meat]
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