This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define int long long
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
using namespace std;
vector<int> zx(222222);
struct node {
int lz, val;
int st, en;
node *left, *right;
void build(int start, int end) {
st = start;
en = end;
if (st == en) {
val = zx[st];
return;
}
int md = (st + en)/2;
left = new node();
right = new node();
left->build(st, md);
right->build(md + 1, en);
}
void lazy() {
left->val += lz;
left->lz += lz;
right->val += lz;
right->lz += lz;
lz = 0;
}
int query(int idx) {
if (st > idx || en < idx) return 0ll;
if (st == en) return val;
lazy();
return left->query(idx) + right->query(idx);
}
void update(int lf, int rg, int x) {
if (st > rg || en < lf ) return;
if (lf <= st && en <= rg) {
lz += x;
val += x;
return;
}
lazy();
left->update(lf, rg, x);
right->update(lf, rg, x);
}
} sg;
int32_t main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int n, q, s, t;
cin >> n >> q >> s >> t;
for (int i = 0; i <= n; i++) cin >> zx[i];
sg.build(0, n);
int ans = 0;
for (int i = 0; i < n; i++) {
if (zx[i] < zx[i+1]) {
ans -= s*(zx[i+1] - zx[i]);
} else {
ans += t*(zx[i] - zx[i+1]);
}
}
while (q --> 0) {
int l, r, x;
cin >> l >> r >> x;
zx[l-1] = sg.query(l-1);
zx[l] = sg.query(l);
if (zx[l-1] < zx[l]) {
ans += s*(zx[l] - zx[l-1]);
} else {
ans -= t*(zx[l-1] - zx[l]);
}
if (r < n) {
zx[r] = sg.query(r);
zx[r+1] = sg.query(r+1);
if (zx[r] < zx[r+1]) {
ans += s*(zx[r+1] - zx[r]);
} else {
ans -= t*(zx[r] - zx[r+1]);
}
}
sg.update(l, r, x);
zx[l-1] = sg.query(l-1);
zx[l] = sg.query(l);
if (zx[l-1] < zx[l]) {
ans -= s*(zx[l] - zx[l-1]);
} else {
ans += t*(zx[l-1] - zx[l]);
}
if (r < n) {
zx[r] = sg.query(r);
zx[r+1] = sg.query(r+1);
if (zx[r] < zx[r+1]) {
ans -= s*(zx[r+1] - zx[r]);
} else {
ans += t*(zx[r] - zx[r+1]);
}
}
cout << ans << '\n';
}
return 0;
}
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