백준[ALGORITHM] - 좌표 정렬하기 (11650)

n = int(input())

temp = {}

for _ in range(n):
    x, y = map(int, input().split())
    
    if x not in temp:
        temp[x] = [y]  
    else:
        temp[x].append(y) 
    
for key in temp:
    temp[key].sort()

sorted_temp = {k: temp[k] for k in sorted(temp)}

for key, value in sorted_temp.items():
    for i in range(len(value)):
        print(key, value[i])