#define _USE_MATH_DEFINES #include<iostream> #include<vector> #include<algorithm> #include<cmath> #include<string> #include<iomanip> #include<numeric> #include<queue> #include<deque> #include<stack> #include<set> #include<map> #include<random> using namespace std; typedef long long ll; const int mod=1e9+7; int tmp[2][200000]; int main(){ static int t,n,a[200001]; cin>>t; while(cin>>n>>a[0]){ for(int i=1;i<=n;i++) cin>>a[i]; if(a[n]!=a[0]){ cout<<"No"<<endl; continue; } tmp[0][0]=a[1]; bool ok=1; for(int i=0;i<n-1;i++){ tmp[1][i]=a[i]-tmp[0][i]; if(tmp[1][i]<0) ok=0; tmp[0][i+1]=a[i+2]-tmp[1][i]; if(tmp[0][i+1]<0) ok=0; } if(tmp[0][n-1]!=a[n-1]){ cout<<"No"<<endl; continue; } cout<<(ok?"Yes":"No")<<endl; } }