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Copy pathCodeforces1234C.cpp
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Codeforces1234C.cpp
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#include<bits/stdc++.h>
using namespace std;
int main()
{
int n,i,j,t,a;
bool flag;
cin>>t;
string x,y;
while(t--)
{
flag=1;
i=0;
cin>>n;
cin>>x>>y;
a=1;
while(1){
if(a==1){
if(x[i]<'3')
{
i++;
if(i==n)
{
flag=0;
break;
}
}
else
{
if(y[i]<'3')
{
flag=0;
break;
}
else {
a=2;
i++;
if(i==n)break;
}
}
}
else {
if(y[i]<'3')
{
i++;
if(i==n) break;
}
else {
if(x[i]<'3')
{
flag=0;
break;
}
else
{
a=1;
i++;
if(i==n){
flag=0;
break;
}
}
}
}
}
if(flag) cout<<"YES"<<endl;
else cout<<"NO"<<endl;
}
}