| # | Time | Username | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 1297833 | khoile08 | Two Antennas (JOI19_antennas) | C++20 | 0 ms | 0 KiB |
#include <bits/stdc++.h>
using namespace std;
#define FOR(i, a, b) for(int i = a; i <= b; i++)
#define FOD(i, a, b) for(int i = a; i >= b; i--)
//#define int long long
#define fi first
#define se second
#define ll long long
#define db double
#define pb push_back
#define ii pair<int,int>
#define sq(i) (1LL * (i) * (i))
#define MASK(i) (1LL << i)
#define task "task"
const int inf = 1e9 + 4;
const ll INF = 1e18;
const int N = 2e5 + 4;
int n, q;
vector<ii> qu[N];
int a[N], b[N], h[N], ans[N];
vector<int> open[N], close[N];
struct Smt {
int mxl[4 * N], mxr[4 * N], mnl[4 * N], mnr[4 * N], res[4 * N];
void init() {
FOR(i, 1, 4 * n) {
mxl[i] = mxr[i] = res[i] = -inf;
mnl[i] = mnr[i] = inf;
}
}
void apply(int id, ii d) { /// max, min
if(d.fi != -inf) {
if(mnl[id] != inf) res[id] = max(res[id], abs(d.fi - mnl[id]));
mxr[id] = max(mxr[id], d.fi);
}
if(d.se != inf) {
if(mxl[id] != -inf) res[id] = max(res[id], abs(d.se - mxl[id]));
mnr[id] = min(mnr[id], d.se);
}
}
void pushdown(int id, int l, int r) {
if(l == r) return;
apply(id << 1, {mxr[id], mnr[id]});
apply(id << 1 | 1, {mxr[id], mnr[id]});
mxr[id] = -inf;
mnr[id] = inf;
}
void pullup(int id, int l, int r) {
res[id] = max(res[id << 1], res[id << 1 | 1]);
mxl[id] = max(mxl[id << 1], mxl[id << 1 | 1]);
mnl[id] = min(mnl[id << 1], mnl[id << 1 | 1]);
}
void posupd(int id, int l, int r, int pos, ii d) {
if(pos < l || pos > r) return;
if(l == r) {
mxl[id] = max(mxl[id], d.fi);
mnl[id] = min(mnl[id], d.se);
return;
}
int mid = l + r >> 1;
pushdown(id, l, r);
posupd(id << 1, l, mid, pos, d);
posupd(id << 1 | 1, mid + 1, r, pos, d);
pullup(id, l, r);
}
void ranupd(int id, int l, int r, int u, int v, ii d) {
if(l > v || r < u) return;
if(l >= u && r <= v) {
apply(id, d);
return;
}
int mid = l + r >> 1;
pushdown(id, l, r);
ranupd(id << 1, l, mid, u, v, d);
ranupd(id << 1 | 1, mid + 1, r, u, v, d);
pullup(id, l, r);
}
int get(int id, int l, int r, int u, int v) {
if(l > v || r < u) return -inf;
if(l >= u && r <= v) return res[id];
int mid = l + r >> 1;
pushdown(id, l, r);
return max(get(id << 1, l, mid, u, v), get(id << 1 | 1, mid + 1, r, u, v));
}
} smt;
signed main() {
if(fopen(task".inp", "r")) {
freopen(task".inp", "r", stdin);
freopen(task".out", "w", stdout);
}
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
cin >> n;
FOR(i, 1, n) {
cin >> h[i] >> a[i] >> b[i];
if(i + a[i] <= n) {
open[i + a[i]].pb(i);
close[min(n, i + b[i])].pb(i);
}
}
cin >> q;
FOR(i, 1, q) {
int l, r;
cin >> l >> r;
qu[r].pb({l, i});
}
smt.init();
FOR(i, 1, n) {
for(int id : open[i]) {
smt.posupd(1, 1, n, id, {h[id], h[id]});
}
if(i - a[i] >= 1) {
smt.ranupd(1, 1, n, max(1, i - b[i]), i - a[i], {h[i], h[i]});
}
for(ii x : qu[i]) {
ans[x.se] = smt.get(1, 1, n, x.fi, i - 1);
}
for(int id : close[i]) {
smt.posupd(1, 1, n, id, {-inf, inf});
}
}
FOR(i, 1, q) cout << (ans[i] == -inf ? -1 : ans[i]) << '\n';
}