Description You have N integers, A1, A2, … , AN. You need to deal with two kinds of operations. One type of operation is to add some given number to each number in a given interval. The other is to ask for the sum of numbers in a given interval. Input The first line contains two numbers N and Q. 1 ≤ N,Q ≤ 100000. The second line contains N numbers, the initial values of A1, A2, … , AN. -1000000000 ≤ Ai ≤ 1000000000. Each of the next Q lines represents an operation. “C a b c” means adding c to each of Aa, Aa+1, … , Ab. -10000 ≤ c ≤ 10000. “Q a b” means querying the sum of Aa, Aa+1, … , Ab. Output You need to answer all Q commands in order. One answer in a line. Sample Input 10 5 1 2 3 4 5 6 7 8 9 10 Q 4 4 Q 1 10 Q 2 4 C 3 6 3 Q 2 4 Sample Output 4 55 9 15 Hint The sums may exceed the range of 32-bit integers.

• 成段增減，區間求和，線段樹+懶惰標記。

public class Main {
    public static Scanner cin;
    public static long[] sum;
    public static long[] cnt;
    public static void pushUp(int rt){
        sum[rt]=sum[rt<<1]+sum[rt<<1|1];
    }
    public static void build(int l,int r,int rt){
        if(l==r){
            sum[rt]=cin.nextLong();
            return
 
;
        }
        int mid=(l+r)>>1;
        build(l,mid,rt<<1);
        build(mid+1,r,rt<<1|1);
        pushUp(rt);
    }
    public static void pushDown(int rt,int d){
        if(cnt[rt]!=0){
            cnt[rt<<1]+=cnt[rt];
            cnt[rt<<1|1]+=cnt[rt];
            sum[rt<<1
 
|1]+=cnt[rt]*(d>>1);
            sum[rt<<1]+=cnt[rt]*(d-(d>>1));
            cnt[rt]=0;
        }
    }
    public static void update(int L,int R,int p,int l,int r,int rt){
        if(L<=l&&r<=R){
            sum[rt]+=(long)p*(r-l+1);
            cnt[rt]+=p;
            return;
        }
        pushDown(rt,r-l+1);
        int mid=(l+r)>>1;
        if(L<=mid){
            update(L,R,p,l,mid,rt<<1);
        }
        if(R>mid){
            update(L,R,p,mid+1,r,rt<<1|1);
        }
        pushUp(rt);
    }
    public static long query(int L,int R,int l,int r,int rt){
        if(L<=l&&r<=R){
            return sum[rt];
        }
        pushDown(rt,r-l+1);
        long ans=0;
        int mid=(l+r)>>1;
        if(L<=mid){
            ans+=query(L,R,l,mid,rt<<1);
        }
        if(R>mid){
            ans+=query(L,R,mid+1,r,rt<<1|1);
        }
        return ans;
    }

    public static void main(String[] args) throws FileNotFoundException, UnsupportedEncodingException {
        cin=new Scanner(new InputStreamReader(System.in));
        //cin=new Scanner(InputUtil.cin());
        int n,q;
        n=cin.nextInt();
        q=cin.nextInt();
        sum=new long[n<<2];
        cnt=new long[n<<2];
        build(1,n,1);
        for(int i=0;i<q;++i){
            String op=cin.next();
            if(op.charAt(0)=='Q'){
                int a=cin.nextInt();
                int b=cin.nextInt();
                System.out.println(query(a,b,1,n,1));
            }else{
                int a=cin.nextInt();
                int b=cin.nextInt();
                int c=cin.nextInt();
                update(a,b,c,1,n,1);
            }
        }
    }

}