#include <bits/stdc++.h>
using namespace std;
#define all(ac) ac.begin(),ac.end()
#define task "tet"
#define fi first
#define se second
#define pii pair<int,int>
#define db long double
#define int long long
struct Event {
int x, y, z;
};
int32_t main() {
ios::sync_with_stdio(false);
cin.tie(0), cout.tie(0);
int n; cin >> n;
Event a[n + 1];
for(int i=1;i<=n;i++) cin >> a[i].z >> a[i].x >> a[i].y;
int q; cin >> q;
while(q--) {
int l, r; cin >> l >> r;
int res = -1;
for(int i=l;i<=r;i++) {
for(int j=l;j<i;j++) {
auto d = a[i], e = a[j];
int l1 = i - d.y, r1 = i - d.x;
int l2 = j + e.x, r2 = j + e.y;
if(j >= l1 && j <= r1 && i >= l2 && i <= r2) res = max(res, abs(d.z - e.z));
}
}
cout << res << '\n';
}
return 0;
}
