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- #include <bits/stdc++.h>
- using namespace std;
- #define ll long long
- #define test int t; cin>>t; for(int cs=1;cs<=t;cs++)
- int main()
- {
- ios_base::sync_with_stdio(0);
- cin.tie(0);
- cout.tie(0);
- test
- {
- ll a[1000],c,d,e=1,f,i,j,k=0,l;
- cin>>c>>k;
- for(i=0; i<c; i++)
- {
- cin>>a[i];
- }
- for(i=1; i<c; i++)
- {
- if(a[i]!=a[i-1])
- {
- e++;
- }
- }
- if(k==1 && e>1)
- {
- cout<<-1<<endl;
- }
- else
- {
- d=1;
- e-=k;
- while(e>0)
- {
- e-=k-1;
- d++;
- }
- cout<<d<<endl;
- }
- }
- return 0;
- }
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