垫块砖一米三
错排公式:f(n)=(f(n-1)+f(n-2))*(n-1)f(1)=0,f(2)=1.program liuke_cuopai;var i,k:longint; a,b,c:qword;begin assign(input,'monkey.in'); assign(output,'monkey.out'); reset(input); rewrite(output); readln(k); a:=0; b:=1; for i:=3 to k do begin c:=(a+b)*(i-1); a:=b; b:=c; end; if k=1 then writeln(a) else if k=2 then writeln(b) else writeln(c); close(input); close(output);end.
优质英语培训问答知识库