用数组存下读入，遍历序列，从 222 到 n−1n-1n−1，如果有 ai−1<aia_{i-1}\lt a_iai−1<ai 且 ai<ai+1a_i\lt a_{i+1}ai<ai+1 那么打上标记。
输出的时候判断标记。
注意是 YE5 和 N0。
YE5
N0
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