#include <bits/stdc++.h>
#define ll long long
using namespace std;
int N, Q, S, T, L, R, X;
ll A[200001], diff[200002];
int main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
cin >> N >> Q >> S >> T >> A[0];
ll TEMP = 0;
for (int i = 1; i <= N; i++) {
cin >> A[i];
diff[i] = A[i] - A[i - 1];
if (diff[i] < 0) TEMP -= diff[i] * T;
else TEMP -= diff[i] * S;
}
while (Q--) {
cin >> L >> R >> X;
if (diff[L] < 0) TEMP += diff[L] * T;
else TEMP += diff[L] * S;
diff[L] += X;
if (diff[L] < 0) TEMP -= diff[L] * T;
else TEMP -= diff[L] * S;
if (R < N) {
if (diff[R + 1] < 0) TEMP += diff[R + 1] * T;
else TEMP += diff[R + 1] * S;
diff[R + 1] -= X;
if (diff[R + 1] < 0) TEMP -= diff[R + 1] * T;
else TEMP -= diff[R + 1] * S;
}
cout << TEMP << '\n';
}
}
