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