[TIL] 정렬(백준 18870 파이썬) 2022.01.30

import sys

T = int(input()) #테스트케이스

for i in range(0,T):
    Cnt = 1
    people = []
    
    N = int(input())
    for i in range(N):
        Paper, Interview = map(int,sys.stdin.readline().split())
        people.append([Paper, Interview])

    people.sort() # 서류 기준 오름차순 정렬
    Max = people[0][1]
    
    for i in range(1,N):
        if Max > people[i][1]:
            Cnt += 1
            Max = people[i][1]

    print(Cnt)