本蒟蒻丑陋的代码

#include<bits/stdc++.h>
using namespace std;
long long n,m,x,y,z,k,q,d[270000],b[270000],a[100005];
void build(long long s,long long t,long long p){
	if(s==t){
		b[p]=a[s];
		return;
	}
	long long m=s+((t-s)>>1);
	build(s,m,p<<1);
	build(m+1,t,(p<<1)|1);
	d[p]=d[p<<1]+d[(p<<1)|1];
}
void update(long long l,long long r,long long c,long long s,long long t,long long p){
	if(l<=s && t<=r){
		d[p]+=(t-s+1)*c,b[p]+=c;
		return;
	}
	long long m=s+((t-s)>>1);
	if(b[p])
		d[p<<1]+=b[p]*(m-s+1),d[(p<<1)|1]+=b[p]*(t-m),
		b[p<<1]+=b[p],b[(p<<1)|1]+=b[p];
	b[p]=0;
	if(l<=m) update(l,r,c,s,m,p<<1);
	if(r>m) update(l,r,c,m+1,t,(p<<1)|1);
	d[p]=d[p<<1]+d[(p<<1)|1];
}
long long getsum(long long l,long long r,long long s,long long t,long long p){
	if(l<=s && t<=r) return d[p];
	long long m=s+((t-s)>>1);
	if(b[p])
		d[p<<1]+=b[p]*(m-s+1),d[(p<<1)|1]+=b[p]*(t-m),
		b[p<<1]+=b[p],b[(p<<1)|1]+=b[p];
	b[p]=0;
	long long sum=0;
	if(l<=m) sum=getsum(l,r,s,m,p<<1);
	if(r>m) sum+=getsum(l,r,m+1,t,(p<<1)|1);
	return sum;
}
int main(){
	scanf("%lld%lld",&n,&q);
	for(int i=1;i<=n;i++) scanf("%lld",&a[i]);
	build(1,n,1);
	while(q--){
		scanf("%lld%lld%lld",&x,&y,&z);
		if(x==1) printf("%lld\n",getsum(y,z,1,n,1));
		else scanf("%lld",&k),update(y,z,k,1,n,1);
	}
	return 0;
}