为什么40

#include<iostream>
#include<cstdio>
using namespace std;
int n,s,t,z,q,x,y,a[200005];
long long b[200005],ans;
int main()
{
//    freopen("t3.in","r",stdin);
//    freopen("t3.out","w",stdout);
    cin>>n>>q>>s>>t;
    for (int i=0;i<=n;i++) scanf("%d",&a[i]);
    for (int i=1;i<=n;i++) b[i]=a[i]-a[i-1];
    for (int i=1;i<=n;i++) 
      if (b[i]>0) ans-=s*b[i];
      else ans-=t*b[i];  
    for (int i=1;i<=q;i++)
      {
          cin>>x>>y>>z;
          if (b[x]>0) ans+=s*b[x];
        else ans+=t*b[x];
        b[x]+=z;
        if (b[x]>0) ans-=s*b[x];
        else ans-=t*b[x];
        if (y<n) 
          {
            if (b[y+1]>0) ans+=s*b[y+1];
            else ans+=t*b[y+1];
            b[y+1]-=z;
            if (b[y+1]>0) ans-=s*b[y+1];
            else ans-=t*b[y+1];  
          }
          printf("%d\n",ans);
      //    for (int j=1;j<=n;j++) cout<<b[j]<<'#';cout<<endl;
      }  
    return 0;
}