[hdu6432]Problem G. Cyclic

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[hdu6432]Problem G. Cyclic

题目大意:给你$n$,一种合法的排列为,排列中没有$s[i\%n+1]-s[i]==1$,求合法方案数题解:容斥,令$f_{i,j}$表示有$i$个元素,至少包含$j$个$s[i\%n+1]-s[i]==1$的方案数,发现$f_{n,1}=\binom n 1(n-2)!$个推广$f_{n,k}=\binom n k(n-k-1)!$(令$(-1)!==1$) $\therefore ans = (-1)^n + \sum_{k = 0}^{n - 1} (-1)^k \binom{n}{k…

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这个题目主要是乘法运算符的重载,卡了我好久,矩阵的乘法用3个嵌套的for循环进行,要分清楚矩阵的乘法结果是第一个矩阵的行,第二个矩阵的列所组成的矩阵. 重载+,*运算符时,可以在参数列表中传两个矩阵引用,分别表示前后进行运算的矩阵,或者是只传运算符之后的矩阵引用,前一个矩阵用的是隐含的this指针指向的矩阵.我用的是后者. Home Web Board ProblemSet Standing Status Statistics Problem G: 强悍的矩阵运算来了 Problem G:…

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