https://codeforces.net/problemset/problem/1659/C

include <bits/stdc++.h>

/*.......................code by LegendARY...............................*/ using namespace std; using ll = long long; // my recusive solution ll Min_dist(ll capital,ll n,ll conq,ll a,ll b,vector&arr){ if(conq >= n-1){ // last wale to direct return b*(arr[n-1]-capital); } // c1 ko don't change, // c1 ko change kr do: take out the minimum; return min(b*abs(capital-arr[conq])+Min_dist(capital,n,conq+1,a,b,arr) ,a*abs(capital-arr[conq])+b*abs(arr[conq]-arr[conq+1])+Min_dist(arr[conq],n,conq+1,a,b,arr));
} //cout<<fixed<<setprecision(6) <<vv; void MYFUN(){ ll n,a,b; cin>>n>>a>>b; vectorarr(n); for(auto &it:arr) cin>>it; ll c1 =0; cout<<Min_dist(0,n,1,a,b,arr)+b*(arr[0])<<endl; } // u had to choose these three

int main(){ ll n; cin>>n; while(n--)MYFUN(); }