A_Dora_s_Set.cpp

// Neepan Biswas
// neepanb ~ codeforces
#include<bits/stdc++.h>
using namespace std;
 
#define fr(i,n) for (lli i=0;i<n;i++)
#define fr1(i,n) for (lli i=1;i<n;i++)
#define fr3(i, n) for (lli i = 0; i <=n; i++)
#define pb push_back
#define eb emplace_back
#define sz(x) (lli)x.size()
#define ff first
#define ss second
#define all(v) v.begin(), v.end()
#define debug(x) cout << '>' << #x << ':' << x << endl;
#define cd(condition, value_if_true, value_if_false) ((condition) ? (value_if_true) : (value_if_false))
 
using lli = long long int;
using ld = long double;
using pi = pair<lli,lli>;
using vp = vector<pi>;
using vi = vector<lli>;
using bl =bool;
using mp=map<lli,lli>;
using ump=unordered_map<lli,lli>;
using str=string;
using ch = char;
 
#pragma GCC optimize("unroll-loops,O3,Ofast")
#pragma GCC target("avx2,avx,fma,bmi,bmi2,lzcnt,popcnt")
 
int main(){
ios::sync_with_stdio(false);
cin.tie(nullptr);
 
lli t;
cin>>t;
 
while(t--){
    lli l,r;
    cin>>l>>r;
    if(l%2){
        l--;
    }
    lli ans=(r-l+1)/4;
    cout<<ans<<endl;

}
return 0;
}