‌main(){inti，n;longsum=，p=;…//输入n值的语句，略for(i=;i<=n;i++){p=p*i;sum=sum+p;}…//输出sum值的语句，略}Asum=***…*nBsum=!+!+…+n!Csum=+++…+nDsum=*+*+(n)*n