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B.cpp
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B.cpp
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#include<bits/stdc++.h>
#include<string>
using namespace std;
#define fastio ios_base::sync_with_stdio(false);cin.tie(NULL)
int main()
{
fastio;
int t,n,i,j,l,r,p;
string s;
cin>>t;
while(t--)
{
p=0;
int ara[30]={0};
cin>>s;
n=s.size();
for(i=0;i<n;i++)
ara[s[i]-'a']++;
for(i=0;i<n;i++)
{
if(ara[i]!=1)
{
p=1;
break;
}
}
if(p==1)
{
cout<<"NO"<<"\n";
continue;
}
for(i=0;i<n;i++)
{
if(i==0)
{
for(j=0;j<n;j++)
{
if(s[j]=='a')
{
l=j;
r=j;
break;
}
}
}
else
{
if(s[max(0,l-1)]==(char)('a'+i))
l=max(0,l-1);
else if(s[min(n-1,r+1)]==(char)('a'+i))
r=min(n-1,r+1);
else
{
p=1;
break;
}
}
//cout<<l<<" "<<r<<"\n";
}
if(p==0)
cout<<"YES"<<"\n";
else
cout<<"NO"<<"\n";
}
return 0;
}