#include<bits/stdc++.h>
#define int long long
#define I128 //||is_same<T,__int128_t>::value||is_same<T,__uint128_t>::value
using namespace std;
/*template<typename T>enable_if_t<is_integral<T>::value I128,void> readmain(T &x)
{
bool neg=false;int c=getchar();
for(;!isdigit(c);c=getchar())if(c=='-')neg=true;
for(x=0;isdigit(c);c=getchar())x=(T)(10*x+(c-'0'));
if(neg)x=-x;
}
template<typename T>T& read(T &x){readmain(x);return x;}
template<typename T,typename ...Tr>void read(T &x,Tr&... r){readmain(x);read(r...);}*/
constexpr int maxn = 2e5 + 9, mod = 1e9 + 7, P = 257, MOD = 1e9 + 9;
int t[maxn * 4], f[maxn * 4], a[maxn];
void build(int v, int tl, int tr) {
if(tl == tr) {
t[v] = a[tl];
return;
}
int tm = (tl + tr) >> 1;
build(v * 2, tl, tm);
build(v * 2 + 1, tm + 1, tr);
t[v] = t[v * 2] + t[v * 2 + 1];
}
void push(int v, int tl, int tr) {
if(f[v]) {
t[v] += f[v] * (tr - tl + 1);
if(tr > tl) {
f[v * 2] += f[v];
f[v * 2 + 1] += f[v];
}
f[v] = 0;
}
}
void upd(int v, int tl, int tr, int l, int r, int x) {
if(l > tr || tl > r || l > r) return;
push(v, tl, tr);
if(l <= tl && tr <= r) {
f[v] += x;
push(v, tl, tr);
return;
}
int tm = (tl + tr) >> 1;
upd(v * 2, tl, tm, l, r, x);
upd(v * 2 + 1, tm + 1, tr, l, r, x);
t[v] = t[v * 2] + t[v * 2 + 1];
}
int get(int v, int tl, int tr, int i) {
if(i == 0) return 0;
if(i < tl || tr < i) return 0;
push(v, tl, tr);
if(tl == tr) return t[v];
int tm = (tl + tr) >> 1;
if(i <= tm) return get(v * 2, tl, tm, i);
return get(v * 2 + 1, tm + 1, tr, i);
}
int n, q, s, T;
inline int ff(int x, int y) {
if(x >= y) {
return (x - y) * T;
}
return -((y - x) * s);
}
void solve(){
cin >> n >> q >> s >> T;
cin >> a[0];
int res = 0;
for(int i = 1; i <= n; ++i) {
cin >> a[i];
if(a[i] <= a[i - 1]) {
res += (a[i - 1] - a[i]) * T;
}
else{
res -= (a[i] - a[i - 1]) * s;
}
}
build(1, 1, n);
while(q--) {
int l, r, x;
cin >> l >> r >> x;
int xl = get(1, 1, n, l - 1), yl = get(1, 1, n, l);
int xr, yr;
res -= ff(xl, yl);
if(r != n) {
xr = get(1, 1, n, r), yr = get(1, 1, n, r + 1);
res -= ff(xr, yr);
}
upd(1, 1, n, l, r, x);
yl += x;
res += ff(xl, yl);
if(r != n) {
xr += x;
res += ff(xr, yr);
}
cout << res << '\n';
}
}
int32_t main(){
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
int tt = 1;
//cin >> tt;
while(tt--) {
solve();
}
}
