#include <bits/stdc++.h>
#include <bits/extc++.h>
//#define double long double
#define IOS ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(nullptr);
#define pb push_back
#define UNIQUE(a) sort(ALL(a));a.resize(unique(ALL(a))-a.begin());
#define ALL(X) X.begin(),X.end()
#define F(i,n) FF(i,0,(n))
#define F1(i,n) FF(i,1,(n)+1)
#define FF(i,n,m) for(int i=(int)n;i<int(m);++i)
#define rF(i,a,b) for(int i=a;i>=(int)b;--i)
#define mkp(a,b) make_pair(a,b)
#define Fi first
#define Se second
#define int ll
//#pragma GCC optimize("O3")//,unroll-loops
//#pragma GCC target("popcnt")
using namespace std;
template<typename T> bool remax(T& a, const T& b) {return b>a?a=b,1:0;}
template<typename T> bool remin(T& a, const T& b) {return b<a?a=b,1:0;}
template<typename T> void clear(T& a){
T b;
swap(a,b);
return;
}
using ll=long long;
using ull=unsigned long long;
using int128= __int128_t;
using uint128= __uint128_t;
using pii =pair<int,int> ;
const double pi=acos(-1);
const int N=2E5+5;
const ll M=105;
const ll INF_64=0x3f3f3f3f3f3f3f3f;
const int INF_32=0x3f3f3f3f;
const int16_t INF_16=0x3f3f;
const int klog=20;
const int mod=1000000007;//1000000007;//998244353
const double eps=1E-3;
void gen(){
}
int bit[N];
int lowbit(int x){
return x&-x;
}
void add(int x,int v){
for(int i=x;i<N;i+=lowbit(i))
bit[i]+=v;
}
int ask(int x){
int re=0;
for(int i=x;i;i-=lowbit(i))
re+=bit[i];
return re;
}
void sol(){
int n,q,s,t;cin>>n>>q>>t>>s;
int cur=0,pre=0;
cin>>pre;
F1(i,n){
int x;cin>>x;
add(i,x-pre);
cur+=(x-pre)*((x-pre>0)?t:s);
pre=x;
//cout<<ask(i)<<" \n"[i==n];
}
//cerr<<cur<<"\n";
F(_,q){
int l,r,d;cin>>l>>r>>d;
int tmp=ask(l)-ask(l-1);
cur-=tmp*(tmp>0?t:s);
cur+=(d+tmp)*((d+tmp)>0?t:s);//cout<<"||"<<(d+tmp)*((d+tmp)>0?t:s)<<"\n";
add(l,d);
if(r!=n){
tmp=ask(r+1)-ask(r);
cur-=tmp*(tmp>0?t:s);
cur+=(tmp-d)*((tmp-d)>0?t:s);
add(r+1,-d);
}
cout<<-cur<<"\n";
//F1(i,n)
//cout<<ask(i)<<" \n"[i==n];
}
}
int32_t main(){
#ifdef LOCAL
//freopen(".in","r",stdin);
//freopen(".out","w",stdout);
#endif // LOCAL
IOS;
int t=1;
gen();
//cin>>t;
FF(i,1,t+1){
//cout<<"Case #"<<i<<": ";
sol();
}
}
