#include <iostream>
#include <algorithm>
#include <vector>
#include <random>
#include <chrono>
#include <set>
#include <map>
#include <stack>
#include <functional>
#include <iomanip>
#include <queue>
#include <cassert>
#include <complex>
#include <cstring>
#include <memory>
#include <bitset>
#include <sstream>
#include <cmath>
#include <numeric>
#include <numbers>
#include <fstream>
using namespace std;
#ifndef template
#ifndef define
#define ll long long
#define ld long double
#define pl pair<ll, ll>
#define pi pair<int, int>
#define nl cout << '\n';
#define x first
#define y second
#define cbit(x) __builtin_popcountll(x)
#define uid(a, b) uniform_int_distribution<ll>(a, b)(rng)
#define siz(x) (int)x.size()
#endif
#ifndef print
void print(size_t x) {cout << x << ' ';}
void print(int x) {cout << x << ' ';}
void print(long long x) {cout << x << ' ';}
void print(float x) {cout << x << ' ';}
void print(long double x) {cout << x << ' ';}
void print(char x) {cout << x << ' ';}
void print(const char* x) {cout << x << ' ';}
void print(bool x) {cout << x << ' ';}
void print(string &x) {cout << x << ' ';}
template<typename T, typename V>
void print(pair<T, V> &p) {print(p.x); print(p.y);}
template<typename T>
void print(vector<T> v) {for (int i = 0; i < v.size(); i++) print(v[i]);}
template<typename T>
void print(vector<vector<T>> v) {
for (int i = 0; i < v.size(); i++){
for (int j = 0; j < v[i].size(); j++)
print(v[i][j]);
nl;
}
}
template <typename T, typename... V>
void print(T t, V&&... v) {print(t); print(v...);}
#endif
#ifndef read
void read(int &x) {cin >> x;}
void read(long long &x) {cin >> x;}
void read(unsigned &x) {cin >> x;}
void read(unsigned long long &x) {cin >> x;}
void read(float &x) {cin >> x;}
void read(long double &x) {cin >> x;}
void read(char &x) {cin >> x;}
void read(string &x) {cin >> x;}
void read(bool &x) {cin >> x;}
template<typename T>
void read(vector<T> &v) {
for (int i = 0; i < v.size(); i++)
read(v[i]);
}
template <typename T, typename... V>
void read(T &t, V&... v) {read(t); read(v...);}
#endif
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
template<class T> bool maxi(T& a, const T& b) {
return a < b ? a = b, 1 : 0;
}
template<class T> bool mini(T& a, const T& b) {
return a > b ? a = b, 1 : 0;
}
template<class... Args>
auto vec(size_t n, Args&&... args) {
if constexpr(sizeof...(args) == 1)
return vector(n, args...);
else
return vector(n, vec(args...));
}
#endif
using namespace std;
const ll inf = 1e15;
const ll def = 2e5+1;
const ll mod = 998244353;
void solve(){
ll n, q, s, t;
read(n, q, s, t);
auto a = vec(n + 1, 0);
read(a);
auto diff = vec(n, 0ll);
ll up = 0, down = 0;
for (int i = 0; i < n; i++){
diff[i] = a[i + 1] - a[i];
if (diff[i] > 0)
up += diff[i];
else
down += diff[i];
}
while (q--){
ll l, r, x;
read(l, r, x);
vector<pi> change;
l--; r--;
if (r + 1 < n)
change.push_back({r + 1, -x});
change.push_back({l, x});
for (auto [x, val] : change){
if (diff[x] > 0)
up -= diff[x];
else
down -= diff[x];
diff[x] += val;
}
for (auto [x, val] : change){
if (diff[x] > 0)
up += diff[x];
else
down += diff[x];
}
ll res = -up * s - down * t;
print(res); nl;
}
}
/*
*/
int32_t main(){
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
// if (ifstream("input.txt").good()){
// freopen("input.txt", "r", stdin);
// freopen("output.txt", "w", stdout);
// }
int t;
t = 1;
while (t--){
solve();
nl;
}
}
