Submission #3454597

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Source Code Expand

N = int(input())
a = list(map(int, input().split()))

cnt = [0]*(int(1e9)+1)
for ai in a:
    cnt[ai] += 1

ans = 0
condi = 0
for ai in a[::-1]:
    if cnt[ai] >= 4:
        ans = max(ans, ai*ai)
        break
    else:
        if condi==0:
            condi = ai
        else:
            ans = condi * ai
            break
            
print(ans)

Submission Info

Judge Result