KOREATECH 1047: 몇 가지 음악을 듣고 있을까

Link : judge.koreatech.ac.kr/problem.php?id=1047

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Python

from sys import stdin
 
dp = dict()
case_cnt = int(stdin.readline().strip())
 
for _ in range(case_cnt):
    data = int(stdin.readline().strip())
    dp[data] = 0
 
print(len(dp))

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