[백준/Python] 15905: 스텔라(STELLA)가 치킨을 선물했어요

N = int(input())

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

arr.sort(key = lambda x: [-x[0], x[1]])

cnt = 0
for i in range(N):
    if arr[4][0] == arr[i][0] and arr[4][1] < arr[i][1]:
    	cnt += 1

print(cnt)

https://www.acmicpc.net/problem/15905