会議室を手配する

📃 質問する

💻 問題を解く

n = int(input())

met_info = []
for i in range(n):
    met_info.append(list(map(int, input().split())))

met_info = sorted(met_info, key=lambda info: info[0])
met_info = sorted(met_info, key=lambda info: info[1])

meeting_count = 0
start = 0

for meeting in met_info:
    if meeting[0] >= start:
        start = meeting[1]
        meeting_count += 1

print(meeting_count)

キー(Key)