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- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- int t,n,sz,i=0,p;
- cin>>t;
- set<int>s;
- while(t--){
- cin>>n, p=2;
- while(n--)
- {
- cin>>sz;
- if(sz>p &&((sz-p)>=1&&(sz-p)<=5))
- s.insert(sz),p=sz;
- }
- printf("Case %d: %d\n",++i,s.size());
- s.clear();
- }
- return 0;
- }
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