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aug2.cpp
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aug2.cpp
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#include<iostream>
using namespace std;
bool in(int a[],int s,int n)
{
int i;
for(i=1;i<s;i++)
{
if(a[i]>a[i+1])
return 0;
}
return 1;
}
bool de(int a[],int s,int n)
{
int i;
for(i=n;i>s;i--)
{
if(a[i]>a[i-1])
return 0;
}
return 1;
}
bool eq(int a[],int s,int e)
{
int i;
for(i=s;i<=e;i++)
if(a[i]!=7)
return 0;
return 1;
}
int main()
{
int a[100],b[7];
int no,n,i,ind;
cin>>no;
while(no--)
{
cin>>n;
bool f=0;
for(i=1;i<=7;i++)
b[i]=0;
for(i=1;i<=n;i++)
{
cin>>a[i];
b[a[i]]=1;
if(a[i]>7)
f=1;
}
for(i=1;i<=7;i++)
if(b[i]==0)
f=1;
if(!f)
{
int s,e;
for(i=1;i<=n;i++)
{
if(a[i]==7){
s=i;
break;
}
}
for(i=n;i>=1;i--)
{
if(a[i]==7){
e=i;
break;
}
}
//cout<<s<<" "<<e<<" ";
if(in(a,s,n)&&de(a,e,n)&&eq(a,e,s))
{
for(i=1;i<=n/2;i++)
{
if(a[i]!=a[n-i+1])
{
f=1;break;
}
}
if(!f)
cout<<"yes"<<endl;
else
cout<<"no"<<endl;
}
else
cout<<"no"<<endl;
}
else
cout<<"no"<<endl;
}
return 0;
}