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ABC170 C - Forbidden List を解いた

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abc170c_1.png
abc170c_2.png
abc170c_3.png

正とは限らない らしいので、
マイナスも入れて for 文を回してみた。

abc170c.py
X,N = map(int,input().split())
P = list(map(int,input().split()))
P = set(P)

num = float("inf")
ans = 0
for i in range(-201,201):
    diff = abs(X-i)
    if i not in P:
       if diff < num:
           ans = i
           num = diff

print(ans)
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