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OJ: noi_openjudge

题目 ID: ch0113-20

难度:未知

标签:python

日期: 2026-07-30 23:01

题意

完整题面见同目录的 problem.md

思路

代码

Python代码

python
from collections import Counter, defaultdict

post_count = int(input())
mentioned_count = Counter()
mentioners = defaultdict(set)

for _ in range(post_count):
    sender, count, *mentioned = map(int, input().split())
    for person in mentioned[:count]:
        mentioned_count[person] += 1
        mentioners[person].add(sender)

focus = max(mentioned_count, key=mentioned_count.get)
print(focus)
print(*sorted(mentioners[focus]))

复杂度

总结