Submission #681629

#	Time	Username	Problem	Language	Result	Execution time	Memory
681629		peijar	Two Antennas (JOI19_antennas)	C++17	100 / 100	645 ms	67564 KiB

antennas

#include <bits/stdc++.h>
#define int long long
using namespace std;

namespace std {
template <typename T> ostream &operator<<(ostream &out, const vector<T> &vec) {
  out << "[";
  for (int i = 0; i < (int)vec.size(); ++i) {
    out << vec[i];
    if (i + 1 < (int)vec.size())
      out << ", ";
  }
  return out << "]";
}
} // namespace std

void dbg_out() { cout << endl; }
template <typename Head, typename... Tail> void dbg_out(Head H, Tail... T) {
  cout << ' ' << H;
  dbg_out(T...);
}

#ifdef DEBUG
#define dbg(...) cout << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__)
#else
#define dbg(...)
#endif

const int MAXN = 1e6;
const int INF = 1e18;

int iDeb[MAXN], iFin[MAXN];
int rangeMin[MAXN], rangeMax[MAXN];
int lazyMax[MAXN], lazyMin[MAXN];
int rangeSol[MAXN];

void pull(int node) {
  rangeMin[node] = min(rangeMin[2 * node], rangeMin[2 * node + 1]);
  rangeMax[node] = max(rangeMax[2 * node], rangeMax[2 * node + 1]);

  rangeSol[node] = max(rangeSol[2 * node], rangeSol[2 * node + 1]);
}

void push(int node) {
  if (lazyMax[node] > -INF) {
    int h = lazyMax[node];
    lazyMax[node] = -INF;
    if (iDeb[node] != iFin[node]) {
      lazyMax[2 * node] = max(lazyMax[2 * node], h);
      lazyMax[2 * node + 1] = max(lazyMax[2 * node + 1], h);
    }
    rangeSol[node] = max(rangeSol[node], h - rangeMin[node]);
  }
  if (lazyMin[node] < INF) {
    int h = lazyMin[node];
    lazyMin[node] = INF;
    if (iDeb[node] < iFin[node]) {
      lazyMin[2 * node] = min(lazyMin[2 * node], h);
      lazyMin[2 * node + 1] = min(lazyMin[2 * node + 1], h);
    }
    rangeSol[node] = max(rangeSol[node], rangeMax[node] - h);
  }
}

void build(int node, int l, int r) {
  iDeb[node] = l, iFin[node] = r;
  rangeMin[node] = lazyMin[node] = INF, rangeMax[node] = lazyMax[node] = -INF;
  rangeSol[node] = -INF;

  if (l == r)
    return;
  build(2 * node, l, (l + r) / 2);
  build(2 * node + 1, (l + r) / 2 + 1, r);
}

void update(int node, int pos, int x) {
  push(node);

  if (iDeb[node] > pos or iFin[node] < pos)
    return;
  if (iDeb[node] == iFin[node]) {
    if (x == INF)
      rangeMin[node] = x, rangeMax[node] = -x;
    else
      rangeMin[node] = rangeMax[node] = x;
    return;
  }
  update(2 * node, pos, x);
  update(2 * node + 1, pos, x);
  pull(node);
}

void insert(int node, int l, int r, int x) {
  push(node);
  if (iDeb[node] > r or iFin[node] < l)
    return;
  if (iDeb[node] >= l and iFin[node] <= r) {
    lazyMax[node] = lazyMin[node] = x;
    push(node);
    return;
  }

  insert(2 * node, l, r, x);
  insert(2 * node + 1, l, r, x);
  pull(node);
}

int query(int node, int l, int r) {
  push(node);
  if (iDeb[node] > r or iFin[node] < l)
    return -INF;
  if (iDeb[node] >= l and iFin[node] <= r)
    return rangeSol[node];
  return max(query(2 * node, l, r), query(2 * node + 1, l, r));
}

signed main(void) {
  ios_base::sync_with_stdio(false);
  cin.tie(0);

  int N;
  cin >> N;
  vector<int> H(N), A(N), B(N);
  for (int i = 0; i < N; ++i)
    cin >> H[i] >> A[i] >> B[i];

  vector<vector<int>> toInsert(N), toDel(N);
  for (int i = 0; i < N; ++i) {
    if (i - A[i] >= 0)
      toInsert[i - A[i]].push_back(i);
    if (i - B[i] > 0)
      toDel[i - B[i] - 1].push_back(i);
  }

  build(1, 0, N - 1);

  int Q;
  cin >> Q;

  vector<int> sol(Q);
  vector<vector<pair<int, int>>> queries(N);
  for (int i = 0; i < Q; ++i) {
    int l, r;
    cin >> l >> r;
    --l, --r;
    queries[l].emplace_back(r, i);
  }

  for (int i = N - 1; i >= 0; --i) {
    dbg(i);
    for (int j : toInsert[i]) {
      dbg("insert", j);
      update(1, j, H[j]);
    }
    for (int j : toDel[i]) {
      dbg("del", j);
      update(1, j, INF);
    }

    int lo = i + A[i], up = i + B[i];
    if (lo < N) {
      up = min(up, N - 1);
      insert(1, lo, up, H[i]);
    }
    for (auto [r, j] : queries[i])
      sol[j] = query(1, i, r);
    dbg(rangeSol[1], rangeMax[1], rangeMin[1]);
  }
  for (int x : sol) {
    x = max(-1LL, x);
    cout << x << '\n';
  }
}

• Subtask 1: 2 / 2
• Subtask 2: 11 / 11
• Subtask 3: 22 / 22
• Subtask 4: 65 / 65