题目还不能看，先贴代码过来
code

#include <iostream>
#include<algorithm>
#include<cstdio>
#include<cstring>
#include<cstdlib>
using namespace std;

int main()
{
    int t;
    cin>>t;
    int c[2000],d[2000];
    while(t--)
    {
        int n,b;
        cin>>n>>b;
        for(int i=1;i<=n;i++)
        {
            scanf("%d",&c[i]);
        }
        for(int j=1;j<=n-1;j++)
        {
            scanf("%d",&d[j]);
        }
        int f = 0;
        int i = 1;
        int sum = 0;
        while(1)
        {
            sum+=c[i];
            sum-=d[i]*b;
            if(sum<0)
            {
                f = 1;
                break;
            }
            i++;
            if(i>n)
                break;

        }
        if(f==0)
            printf("Yes\n");
        else
            printf("No\n");
    }
    return 0;
}