KingsCC的博客

#include <iostream>#include <algorithm>#include <cstdio>#include <cstring>#include<string>using namespace std;long long c(int n, int m){    int a = 1;    for (int...

#include <iostream>  #include <string>#include<math.h>#include<algorithm>using namespace std;long long jiecheng(int x){    long long  s = 1;    for (int i = 1; i <= x...

错排递推公式f(n)=(f(n-1)+f(n-2))*(n-1) #include <iostream> #include <string> #include<math.h>#include<algorithm>using namespace std;int main(){ int n; int l; ...