Codeforces Round #829 cf1753A Cowardly Rooks

一个值域{0,-1,1}数组切分序列后

每个序列乘 {1,-1,1,-1...} 要求最后总和为0

实际上只切出若干个{1} {1,-1} 两种

其中1的位置是任意的可以全取1

－1左侧必1

先假设全1 算出总值，比如总值是4 那再看能不能把两个1 改成－1 从左到右依次贪心改即可。

代码回去补

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