#ifdef LOCAL
#include "local.h"
#else
#include <bits/stdc++.h>
#define debug(...)
#define DB(...)
#endif
using namespace std;
const bool __initialization = []() {
cin.tie(nullptr)->sync_with_stdio(false);
#define TASK "empty"
if (fopen(TASK".inp", "r")) {
(void)(!freopen(TASK".inp", "r", stdin));
(void)(!freopen(TASK".out", "w", stdout)); }
cout << setprecision(12) << fixed;
return true;
}();
using ll = long long;
using ld = long double;
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define For(i, l, r) for (int i = (l); i <= (r); ++i)
#define Ford(i, r, l) for (int i = (r); i >= (l); --i)
#define Rep(i, n) For (i, 0, (n) - 1)
#define Repd(i, n) Ford (i, (n) - 1, 0)
#define Fe(...) for (auto __VA_ARGS__)
template <class C> inline int isz(const C& c) { return static_cast<int>(c.size()); }
template <class T> inline bool chmin(T& a, const T& b) { return (a > b) ? a = b, true : false; }
template <class T> inline bool chmax(T& a, const T& b) { return (a < b) ? a = b, true : false; }
constexpr ld eps = 1e-9;
constexpr int inf = 1e9;
constexpr ll linf = 1e18;
// =============================================================================
constexpr int maxn = 2e5 + 5;
int n, nq, incr, decr;
int a[maxn];
ll diff[maxn];
ll change(ll x) {
if (x < 0) {
return x * incr;
} else {
return x * decr;
}
}
signed main() {
cin >> n >> nq >> incr >> decr;
For (i, 0, n) cin >> a[i];
ll sum = 0;
For (i, 1, n) {
diff[i] = a[i - 1] - a[i];
sum += change(diff[i]);
}
Rep (_, nq) {
int l, r, x; cin >> l >> r >> x;
{
sum -= change(diff[l]);
diff[l] -= x;
sum += change(diff[l]);
}
if (r < n) {
sum -= change(diff[r + 1]);
diff[r + 1] += x;
sum += change(diff[r + 1]);
}
cout << sum << '\n';
}
}
