树状数组区间修改

#include<cstdio>
#include<cstring>
using namespace std;
#define lowbit(x) x&-x
#define N 200010
typedef long long ll;
int n,q;
ll sum[N],t1[N],t2[N];
void add1(int pos,int delta)
{
    for(int i=pos;i<=n;i+=lowbit(i))
        t1[i]+=delta;
}
void add2(int pos,int delta)
{
    for(int i=pos;i<=n;i+=lowbit(i))
        t2[i]+=delta;
}
ll sum1(int pos)
{
    ll ret=0;
    for(int i=pos;i>0;i-=lowbit(i))
        ret+=t1[i];
    return ret;
}
ll sum2(int pos)
{
    ll ret=0;
    for(int i=pos;i>0;i-=lowbit(i))
        ret+=t2[i];
    return ret;
}
int main()
{
    scanf("%d",&n);
    for(int i=1;i<=n;i++)
    {
        scanf("%d",&sum[i]);
        sum[i]+=sum[i-1];
    }
    scanf("%d",&q);
    while(q--)
    {
        int opt,a,b; scanf("%d%d%d",&opt,&a,&b);
        if(opt==1)
        {
            int x; scanf("%d",&x);
            add1(a,-(a-1)*x);
            add1(b+1,b*x);
            add2(a,x);
            add2(b+1,-x);
        }
        else 
        {
            printf("%lld\n",sum[b]-sum[a-1]+sum1(b)-sum1(a-1)+sum2(b)*b-sum2(a-1)*(a-1));
        }
    }
    return 0;
}