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1.题目描述与输入描述不一样,真的像做梦一样
2.测试用例很奇怪,居然有全0的期望结果,与闭区间矛盾,与1 ≤M ≤N矛盾
3.若想通过可以补充: M = max(M, 1)
与 慕测论坛 的连接断开,我们正在尝试重连,请耐心等待