# 离线只读验证：不访问网络、不操作设备，只读取同目录合成输入。
import json, math, struct, statistics
from pathlib import Path
def check(d):
 allout=[]
 for seq in d['sequences']:
  cache=None; out=[]
  for r in seq:
   if r['status']==200: cache={'etag':r['etag'],'value':r['value']}
   out.append(cache['value'] if cache else '缺副本需重取')
  allout.append(out)
 return allout

if __name__=='__main__':
 fixture=json.loads(Path(__file__).with_name('fixture.json').read_text(encoding='utf-8'))
 actual=check(fixture['input'])
 assert actual==fixture['expected'], {'实际':actual,'预期':fixture['expected']}
 print(json.dumps({'状态':'通过','实际':actual,'边界':'仅离线合成样例，现场未测'},ensure_ascii=False))