[B11650][좌표 정렬하기][python]

https://www.acmicpc.net/problem/11650

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n = int(input())
arr = []

for i in range(n):
    x, y = map(int, input().split())
    arr.append([x, y])

arr.sort()
for i in range(n):
    print(arr[i][0], arr[i][1])