Chiku

#include <iostream>
#include <algorithm>
using namespace std;

int main() {
    int t;
    cin>>t;
    while(t--) {
        int m,x,y,h=0;
        cin>>m>>x>>y;
        int a[m];
        for(int i=0;i<m;i++) {
            cin>>a[i];
        }
        sort(a,a+m);
        int s = x*y;
        for(int i=0;i<m;i++) {
            if(i==0) {
             if(a[i]-s > 1) {
                h += a[i]-s-1;
            }
            }
            
            if(i==m-1) {
                if(a[i]+s < 100) {
                h += 100 - (a[i]+s);
            }    
            }
            else {
                if(a[i]+s < (a[i+1]-s)) {
                h += (a[i+1]-s) - (a[i]+s+1);
            }
            }
            
        }
        
        cout<<h<<endl;
    }
	// your code goes here
	return 0;
}