#include <bits/stdc++.h>
#ifdef local
#define safe std::cerr<<__PRETTY_FUNCTION__<<" line "<<__LINE__<<" safe\n"
#define debug(a...) qqbx(#a, a)
template <typename ...T> void qqbx(const char *s, T ...a) {
int cnt = sizeof...(T);
((std::cerr << "(" << s << ") = (") , ... , (std::cerr << a << (--cnt ? ", " : ")\n")));
}
#else
#define debug(...) ((void)0)
#define safe ((void)0)
#endif // local
using namespace std;
const int maxn = 200025;
int H[maxn], A[maxn], B[maxn];
int ans[2001][2001];
signed main() {
ios_base::sync_with_stdio(0), cin.tie(0);
int n;
cin >> n;
for (int i = 1; i <= n; i++) cin >> H[i] >> A[i] >> B[i];
memset(ans, -1, sizeof ans);
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= i; j++) {
if (max(A[i], A[j]) <= (i-j) && (i-j) <= min(B[i], B[j]))
ans[j][i] = abs(H[i] - H[j]);
}
}
for (int l = n; l >= 1; l--) {
for (int r = 1; r <= n; r++)
ans[l][r] = max({ ans[l][r], ans[l+1][r], ans[l][r-1] });
}
int q;
cin >> q;
while (q--) {
int l, r;
cin >> l >> r;
cout << ans[l][r] << '\n';
}
}
