1 #include<bits/stdc++.h>
 2 #define F(i,a,b) for(int i=a;i<=b;i++)
 3 #define ls l,m,rt<<1
 4 #define rs m+1,r,rt<<1|1
 5 using namespace std;
 6 typedef long long ll;
 7 const int N=4e6+7;
 8 
 9 int t,n,m,mx[N],se[N],num[N];
10 ll sum[N];
11 
12 inline void dec_tag(int rt,int val)
13 {
14     if(val>=mx[rt])return;
15     sum[rt]-=1ll*(mx[rt]-val)*num[rt],mx[rt]=val;
16 }
17 
18 inline void PD(int rt){dec_tag(rt<<1,mx[rt]),dec_tag(rt<<1|1,mx[rt]);}
19 
20 inline void PU(int rt)
21 {
22     int l=rt<<1,r=rt<<1|1;
23     sum[rt]=sum[l]+sum[r],num[rt]=0;
24     mx[rt]=max(mx[l],mx[r]);
25     se[rt]=max(max(se[l],se[r]),mx[l]==mx[r]?0:min(mx[l],mx[r]));
26     if(mx[rt]==mx[l])num[rt]+=num[l];
27     if(mx[rt]==mx[r])num[rt]+=num[r];
28 }
29 
30 void build(int l=1,int r=n,int rt=1)
31 {
32     se[rt]=-1;
33     if(l==r)
34     {
35         int x;
36         scanf("%d",&x);
37         sum[rt]=mx[rt]=x,num[rt]=1;
38         return;
39     }
40     int m=l+r>>1;
41     build(ls),build(rs);
42     PU(rt);
43 }
44 
45 void update(int L,int R,int val,int l=1,int r=n,int rt=1)
46 {
47     if(val>=mx[rt])return;
48     if(L<=l&&r<=R&&val>se[rt]){dec_tag(rt,val);return;}
49     PD(rt);
50     int m=l+r>>1;
51     if(L<=m)update(L,R,val,ls);
52     if(R>m)update(L,R,val,rs);
53     PU(rt);
54 }
55 
56 ll query(int type,int L,int R,int l=1,int r=n,int rt=1)
57 {
58     if(L<=l&&r<=R){return type==1?mx[rt]:sum[rt];}
59     PD(rt);
60     int m=l+r>>1;ll ans=0;
61     if(L<=m)ans=(type==1?max(ans,query(type,L,R,ls)):ans+query(type,L,R,ls));
62     if(R>m)ans=(type==1?max(ans,query(type,L,R,rs)):ans+query(type,L,R,rs));
63     return ans;    
64 }
65 
66 int main()
67 {
68     scanf("%d",&t);
69     while(t--)
70     {
71         scanf("%d%d",&n,&m);
72         build();
73         int a,b,c,d;
74         F(i,1,m)
75         {
76             scanf("%d",&a);
77             if(!a)scanf("%d%d%d",&b,&c,&d),update(b,c,d);
78             else scanf("%d%d",&b,&c),printf("%lld\n",query(a,b,c));
79         }
80     }
81     return 0;
82 }