#include<bits/stdc++.h> #define int long long using namespace std; int a[200005]; signed main() { ios_base::sync_with_stdio(false); cin.tie(0); int n, q, s, t; cin>>n>>q>>s>>t; for(int i = 0; i <= n; i++) cin>>a[i]; for(int i = n; i >= 1; i--) a[i] -= a[i-1]; int ans = 0; for(int i = 1; i <= n; i++){ if(a[i] > 0) ans -= s*a[i]; else ans -= t*a[i]; } for(int test = 0; test < q; test++){ int l, r, x; cin>>l>>r>>x; r++; if(a[l] > 0) ans += s*a[l]; else ans += t*a[l]; a[l] += x; if(a[l] > 0) ans -= s*a[l]; else ans -= t*a[l]; if(r <= n){ if(a[r] > 0) ans += s*a[r]; else ans += t*a[r]; a[r] -= x; if(a[r] > 0) ans -= s*a[r]; else ans -= t*a[r]; } cout<<ans<<'\n'; /*for(int i = 1; i <= n; i++) cerr<<a[i]<<" "; cerr<<endl;*/ } }