A. Vova and Train ( Codeforces Round #515 (Div. 3) )

#include <iostream>
#include <bits/stdc++.h>
using namespace std;

int main()
{
    int t,L,v,l,r,sum,num;
    while(~scanf("%d",&t))
    {
        while(t--)
        {
            scanf("%d%d%d%d",&L,&v,&l,&r);
            sum = 0;
            num = 0;
            sum = L / v;
            num = r / v - (l - 1) / v;
            printf("%d\n",sum - num);
        }
    }
    return 0;
}