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D.cpp
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D.cpp
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#include<bits/stdc++.h>
using namespace std;
#define fastio ios::sync_with_stdio(0);cin.tie(0)
int main()
{
fastio;
long long t,n,k,i,cnt[40],x;
string s;
cin>>t;
while(t--)
{
cin>>n>>k;
cin>>s;
for(i=0;i<26;i++)
cnt[i]=0;
x=0;
for(i=0;i<n;i++)
cnt[s[i]-'a']++;
for(i=0;i<26;i++)
{
x+=cnt[i]-cnt[i]%2;
}
for(i=1;i<=n;i++)
{
if(i%2==0)
{
if(k*i>x)
{
cout<<i-1<<"\n";
break;
}
}
else
{
if(n<k*i)
{
cout<<i-1<<"\n";
break;
}
}
if(i==n)
{
cout<<n<<"\n";
}
}
}
return 0;
}