为什么J组T2爆弹了啊555

#include<bits/stdc++.h>
using namespace std;
int n,d;
long long now,fin;
int dis[100005];
int cost[100005];
int Read()
{
    int x=0,f=1;
    char ch=getchar();
    while(ch<'0'||ch>'9')
    {
        if(ch=='-')
        {
            f=-1;
        }
        ch=getchar();
    }
    while(ch>='0'&&ch<='9')
    {
        x=x*10+ch-'0';
        ch=getchar();
    }
    return x*f;
}
void Write(int x)
{
    if(x<0)
    {
        x=-x;
        putchar('-');
    }
    if(x>9)
    {
        Write(x/10);
    }
    putchar(x%10+'0');
}
int main()
{
    // freopen("road.in","r",stdin);
    // freopen("road.out","w",stdout);
    n=Read(),d=Read();
    for(int i=1;i<n;i++)//dis[i] means the distance from point i to point i+1
    {
        dis[i]=Read();
    }
    for(int i=1;i<n;i++)
    {
        cost[i]=Read();
    }
    int p=1,cz,jl=0;
    while(p<n)
    {
        cz=n;
        for(int i=p+1;i<n;i++)
        {
            if(cost[i]<cost[p])
            {
                cz=i;
                break;
            }
        }
        jl=0;
        for(int i=p;i<cz;i++)
        {
            jl=jl+dis[i];
        }
        if(now>=jl)//can get there
        {
            now=now-jl;
        }
        else
        {
            //cout<<now<<" ";
            now=jl+(d-(jl%d))-now;
            //cout<<now<<" ";
            fin=fin+now/d*cost[p];
            now=now-jl;
        }
        //cout<<now/d*cost[p]<<" "<<jl<<" "<<p<<"\n";
        p=cz;
    }
    cout<<fin;
    return 0;
}