分块模板

#include<bits/stdc++.h>  
//#pragma comment(linker, "/STACK:1024000000,1024000000")   
#include<stdio.h>  
#include<algorithm>  
#include<queue>  
#include<string.h>  
#include<iostream>  
#include<math.h>                    
#include<stack>
#include<set>  
#include<map>  
#include<vector>  
#include<iomanip> 
#include<bitset>
using namespace std;         //

#define ll long long  
#define ull unsigned long long
#define pb push_back  
#define FOR(a) for(int i=1;i<=a;i++) 
#define sqr(a) (a)*(a)
#define dis(a,b) sqrt(sqr(a.x-b.x)+sqr(a.y-b.y))
ll qp(ll a,ll b,ll mod){
	ll t=1;while(b){if(b&1)t=t*a%mod;b>>=1;a=a*a%mod;}return t;
}
struct DOT{ll x;ll y;};
inline void read(int &x){int k=0;char f=1;char c=getchar();for(;!isdigit(c);c=getchar())if(c=='-')f=-1;for(;isdigit(c);c=getchar())k=k*10+c-'0';x=k*f;} 
const int dx[4]={0,0,-1,1};
const int dy[4]={1,-1,0,0};
const int inf=0x3f3f3f3f; 
const ll Linf=0x3f3f3f3f3f3f3f3f;
const ll mod=1e9+7;;

const int maxn=1e5+34;

ll a[maxn],sum[maxn],add[maxn];
int L[maxn],R[maxn];	//块i的左右端点
int pos[maxn];			//块所属
int n,m,t;

void init(){
	t=sqrt(n);
	for(int i=1;i<=t;i++){
		L[i]=(i-1)*t+1;
		R[i]=i*t;
	}
	if(R[t]<n){t++;L[t]=R[t-1]+1,R[t]=n;}
	for(int i=1;i<=t;i++)
		for(int j=L[i];j<=R[i];j++){
			pos[j]=i;
			sum[i]+=a[j];
		}
}
void update(int l,int r,ll d){
	int p=pos[l],q=pos[r];
	if(p==q){
		for(int i=l;i<=r;i++)a[i]+=d;
		sum[p]+=d*(r-l+1);
	}else{
		for(int i=p+1;i<=q-1;i++)add[i]+=d;
		for(int i=l;i<=R[p];i++)a[i]+=d;
		sum[p]+=d*(R[p]-l+1);
		for(int i=L[q];i<=r;i++)a[i]+=d;
		sum[q]+=d*(r-L[q]+1);
	}
}
ll query(int l,int r){
	int p=pos[l],q=pos[r];
	ll ans=0;
	if(p==q){
		for(int i=l;i<=r;i++)ans+=a[i];
		ans+=add[p]*(r-l+1);
	}else{
		for(int i=p+1;i<=q-1;i++){
			ans+=sum[i]+add[i]*(R[i]-L[i]+1);
		}
		for(int i=l;i<=R[p];i++)ans+=a[i];
		ans+=add[p]*(R[p]-l+1);
		for(int i=L[q];i<=r;i++)ans+=a[i];
		ans+=add[q]*(r-L[q]+1);
	}
	return ans;
}

int main(){
	scanf("%d%d",&n,&m);
	for(int i=1;i<=n;i++)scanf("%lld",&a[i]);
	init();
	while(m--){
		char op[3];
		int l,r,d;
		scanf("%s%d%d",op,&l,&r);
		if(op[0]=='C'){
			scanf("%d",&d);
			update(l,r,d);
		}else{
			printf("%lld
",query(l,r));
		}
	}
}