This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
int x, y, n, q;
long long z, s, t, a[200001], f[800001], tg[200001], lazy[800001], ans;
long long cal(int i)
{
return t*max(0ll,a[i-1]-a[i])-s*max(0ll,a[i]-a[i-1]);
}
void init(int k, int l, int r)
{
if(l>r)return;
if(l==r)
{
f[k]=a[l];
return;
}
int mid=(l+r)/2;
init(2*k,l,mid);
init(2*k+1,mid+1,r);
f[k]=max(f[2*k],f[2*k+1]);
}
void dolazy(int k, int l, int r)
{
if(lazy[k]==0)return;
f[k]+=lazy[k];
if(l!=r)
{
lazy[2*k]+=lazy[k];
lazy[2*k+1]+=lazy[k];
}
lazy[k]=0;
}
void upd(int k, int l, int r, int L, int R, long long x)
{
dolazy(k,l,r);
if(l>r||L>R||R<l||L>r)return;
if(L<=l&&r<=R)
{
f[k]+=x;
if(l!=r)
{
lazy[2*k]+=x;
lazy[2*k+1]+=x;
}
return;
}
int mid=(l+r)/2;
upd(2*k,l,mid,L,R,x);
upd(2*k+1,mid+1,r,L,R,x);
f[k]=max(f[2*k],f[2*k+1]);
}
long long gets(int k, int l, int r, int vt)
{
dolazy(k,l,r);
if(l>r||vt>r||vt<l)return 0ll;
if(l==r)return f[k];
int mid=(l+r)/2;
return gets(2*k,l,mid,vt)+gets(2*k+1,mid+1,r,vt);
}
int main()
{
ios_base::sync_with_stdio(false);
cin>>n>>q>>s>>t;
for(int i=0;i<=n;++i)
{
cin>>a[i];
if(i>=1)
{
tg[i]=cal(i);
ans+=tg[i];
}
}
init(1,1,n);
while(q--)
{
cin>>x>>y>>z;
upd(1,1,n,x,y,z);
a[x]=gets(1,1,n,x);
a[x-1]=gets(1,1,n,x-1);
ans+=cal(x)-tg[x];
tg[x]=cal(x);
if(y!=n)
{
a[y]=gets(1,1,n,y);
a[y+1]=gets(1,1,n,y+1);
ans+=cal(y+1)-tg[y+1];
tg[y+1]=cal(y+1);
}
cout<<ans<<"\n";
}
}
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