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- #include<bits/stdc++.h>
- using namespace std;
- #define ll long long
- int main()
- {
- ll t,a[100000],y[100000],c,d,e,f,i,j,k,l;
- cin>>t;
- for(c=1;c<=t;c++)
- {
- f=0;
- cin>>d>>e;
- for(i=0;i<d;i++)
- {
- cin>>a[i]>>y[i];
- }
- sort(y,y+d);
- f=y[0]+e;
- l=1;
- for(j=0;j<d;j++)
- {
- if(f<y[j])
- {
- l++;
- f=y[j]+e;
- }
- }
- printf("Case %lld: %lld\n",c,l);
- }
- return 0;
- }
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