@durga_7 @rishup_nitdgp @rahulkiller26 @everule1
this is my code
Blockquote
#include
using namespace std;
int main()
{
int t;
cin>>t;
while(t–)
{
int n,l=0;
cin>>n;
int a[n];
for(int i=0;i<n;i++)
cin>>a[i];
int vis[1001]={0},c=1;
vis[a[0]]=1;
for(int i=1;i<n;i++)
{
if(a[i]-a[i-1]==0)
continue;
else
if(vis[a[i]]==1)
c=0;
vis[a[i]]++;
}
int freq[1001]={0},unq[1001]={0};
for(int i=0;i<n;i++)
freq[a[i]]++;
for(int i=0;i<n;i++)
if(freq[i]>1)
unq[freq[i]]++;
int flag=1;
for(int i=0;i<n;i++)
if(unq[i]>1)
{
flag=0;
break;
}
for(int i=1;i<n;i++)
{
if(a[i]!=a[i-1])
l++;
}
if(l==n-1)
flag=0;
// cout<<"flag is "<<flag<<" c is "<<c<<endl;
if(flag==0||c==0)
cout<<"NO"<<endl;
else
if(flag==1&&c==1)
cout<<"YES"<<endl;
}
}