AC

#include<bits/stdc++.h>
using namespace std;
int main()
{
int n,q;
cin>>n>>q;
while(q--)
{
int c=0;
string s;
cin>>s;
if(s[0]'0'&&s[1]'0'||s[n-1]'0'&&s[n-2]'0')//排除特殊
{
cout<<"No\n";
}
else
{
for(int i=0;i<n;i++)
{
if(s[i]-'0'==0)
{
if(s[i+1]-'0'==0&&s[i+2]-'0'==0)//排除三个0
{
cout<<"No\n";
c=1;
break;
}
}
if(s[i]-'0'==1)
{
if(s[i+1]-'0'1)//排除两个1
{
cout<<"No\n";
c=1;
break;
}
}
}
if(c0)
cout<<"Yes\n";
}

}    
return 0;

}