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63 lines (50 loc) · 800 Bytes
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RainowArray.java
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63 lines (50 loc) · 800 Bytes
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import java.util.Scanner;
public class RainowArray
{
public static void main(String[] args) {
Scanner in =new Scanner(System.in);
int T=in.nextInt();
for(int t=0;t<T;t++)
{
boolean ans=false;
int n=in.nextInt();
int a[]=new int[n];
for(int i=0;i<n;i++)
a[i]=in.nextInt();
int ai=1;
if(a[0]==1&&a[n-1]==1)
{
for(int i=1;i<=n/2;i++)
{
if(a[i]==a[n-i-1])
{
if(a[i]!=ai)
{
if(a[i]==ai+1)
{
if(a[i-1]==ai)
{
ai++;
ans=true;
}
}
else
{
ans=false;
break;
}
}
}
else
{ans=false;}
}
}
else
{ans=false;}
if(ans)
System.out.println("yes");
else
System.out.println("no");
}
}
}