L1-013. 计算阶乘和

#include<iostream>#include<set>#include<vector>#include<algorithm>#include<cmath>#include<cstring>using namespace std;int mp[200];//打表typedef unsigned long long ll;ll vp[20];ll cal(ll a){    ll b=1;    for(ll i=1;i<=a;i++)        b=b*i;    return b; }void pre(){    vp[0]=0;    for(int i=1;i<=10;i++){        ll val=cal(i);        vp[i]=vp[i-1]+val;    }} int main(){    pre();    int a;    cin>>a;    cout<<vp[a]<<endl;    return 0;}