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VERSION 2.0

import sys
import heapq

N = int(sys.stdin.readline())

res = []
for i in range(N):
    a,b = list(map(int,sys.stdin.readline().split()))
    heapq.heappush(res , (a,b))

while res:
    print(*heapq.heappop(res))

VERSION 1.0

import sys

N = int(sys.stdin.readline())
res  =[] 
for i in range(N):
    a = list(map(int ,sys.stdin.readline().rstrip().split()))
    res.append(a)


res = sorted(res)
for i in res:
    for p in i:
        print(p , end=' ')
    print('')

a = [3,3] or [1,-1] 

 

sorted()함수 사용하면 자동 정렬

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