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m = int(input('请输入整数的个数,回车结束'))
max_n = int(input('请输入一个整数,回车结束'))
i = 0
second_n = 0
while i < m-1:
i += 1
n = int(input('请输入一个整数,回车结束'))
if n > max_n:
second_n = max_n
max_n = n
print('次大值是:',second_n)
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