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- #include<bits/stdc++.h>
- using namespace std;
- typedef long long ll;
- int main()
- {
- int te;
- cin>>te;
- for(int t=1;t<=te;t++)
- {
- int n;
- cin>>n;
- int ara[n+1];
- for(int i=0;i<n;i++)cin>>ara[i];
- double x=ara[0]-2;
- int cnt;
- cnt= ceil(x/5.0);
- for(int i=1;i<n;i++)
- {
- x=ara[i]-ara[i-1];
- cnt+=ceil(x/5.0);
- }
- printf("Case %d: %d\n",t,cnt);
- }
- }
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