oj.uz

답안 #783094

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
783094 2023-07-14T15:21:26 Z tvladm2009 3단 점프 (JOI19_jumps) C++17
100 / 100
 882 ms 127944 KB 
#include <bits/stdc++.h>

using namespace std;
const int N = (int) 5e5 + 7;
const int INF = (int) 2e9;
int n, a[N], nextBigger[N], q;

struct rmq {
  const int K = 20;
  vector<vector<int>> tab;
  vector<int> lg2;
  int n;

  void init(int nn) {
    n = nn;
    lg2.resize(n + 1);
    for (int i = 2; i <= n; i++) {
      lg2[i] = 1 + lg2[i / 2];
    }
    tab.resize(K);
    for (int i = 0; i < K; i++) {
      tab[i].resize(n + 1);
    }
  }

  void build(int a[]) {
    for (int i = 1; i <= n; i++) {
      tab[0][i] = a[i];
    }
    for (int k = 1; k < K; k++) {
      for (int i = 1; i + (1 << k) - 1 <= n; i++) {
        tab[k][i] = max(tab[k - 1][i], tab[k - 1][i + (1 << (k - 1))]);
      }
    }
  }

  int query(int x, int y) {
    if (x > y) {
      return -INF;
    }
    assert(1 <= x && x <= y && y <= n);
    int p = lg2[y - x + 1];
    return max(tab[p][x], tab[p][y - (1 << p) + 1]);
  }
};

struct Offer {
  int value;
  int lft;
  int rgh;
};

struct Question {
  int l;
  int r;
  int ind;
};

bool operator < (Offer a, Offer b) {
  return a.lft > b.lft;
}

vector<Question> questionsAt[N];
int best[N];

struct node {
  int maxA;
  int maxAB;
};

node operator + (node a, node b) {
  return {max(a.maxA, b.maxA), max(a.maxAB, b.maxAB)};
}

node t[4 * N];
int applyToAll[4 * N];

void push(int v, int tl, int tr) {
  if (applyToAll[v] == -INF) {
    return;
  }
  t[v].maxAB = max(t[v].maxAB, t[v].maxA + applyToAll[v]);
  if (tl < tr) {
    applyToAll[2 * v] = max(applyToAll[2 * v], applyToAll[v]);
    applyToAll[2 * v + 1] = max(applyToAll[2 * v + 1], applyToAll[v]);
  }
  applyToAll[v] = -INF;
}
 
void build(int v, int tl, int tr) {
  if (tl == tr) {
    t[v].maxA = a[tl];
  } else {
    int tm = (tl + tr) / 2;
    build(2 * v, tl, tm);
    build(2 * v + 1, tm + 1, tr);
    t[v] = t[2 * v] + t[2 * v + 1];
  }
}
 
void apply(int v, int tl, int tr, int l, int r, int x) {
  push(v, tl, tr);
  if (tr < l || r < tl) {
    return;
  }
  if (l <= tl && tr <= r) {
    applyToAll[v] = x;
    push(v, tl, tr);
    return;
  }
  int tm = (tl + tr) / 2;
  apply(2 * v, tl, tm, l, r, x);
  apply(2 * v + 1, tm + 1, tr, l, r, x);
  t[v] = t[2 * v] + t[2 * v + 1];
}
 
node get(int v, int tl, int tr, int l, int r) {
  push(v, tl, tr);
  if (tr < l || r < tl) {
    return {-INF, -INF};
  }
  if (l <= tl && tr <= r) {
    return t[v];
  }
  int tm = (tl + tr) / 2;
  return get(2 * v, tl, tm, l, r) + get(2 * v + 1, tm + 1, tr, l, r);
}

signed main() {
  ios::sync_with_stdio(0); cin.tie(0);

  //freopen("input", "r", stdin);

  for (int i = 0; i < 4 * N; i++) {
    applyToAll[i] = -INF;
    t[i].maxA = -INF;
    t[i].maxAB = -INF;
  }

  cin >> n;
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
  }
  build(1, 1, n);
  rmq rmq;
  rmq.init(n);
  rmq.build(a);

  {
    vector<int> st;
    for (int i = n; i >= 1; i--) {
      while (!st.empty() && a[i] >= a[st.back()]) {
        st.pop_back();
      }
      if (st.empty()) {
        nextBigger[i] = n + 1;
      } else {
        nextBigger[i] = st.back();
      }
      st.push_back(i);
    }
  }

  vector<Offer> offers;
  for (int i = 1; i <= n; i++) {
    for (int j = i + 1; j <= min(n, nextBigger[i]); j = nextBigger[j]) {
      if (2 * j - i <= n) {
        offers.push_back({a[i] + a[j], i, 2 * j - i});
      }
    }
  }
  sort(offers.begin(), offers.end());

  cin >> q;
  vector<int> sol(q, -1);
  for (int i = 0; i < q; i++) {
    int l, r;
    cin >> l >> r;
    questionsAt[l].push_back({l, r, i});
  }

  for (int i = 1; i <= n; i++) {
    best[i] = -INF;
  }

  int last = -1;

  for (int l = n; l >= 1; l--) {
    while (last + 1 < (int) offers.size() && l <= offers[last + 1].lft) {
      last++;
      apply(1, 1, n, offers[last].rgh, n, offers[last].value);
    }
    for (auto &it : questionsAt[l]) {
      sol[it.ind] = get(1, 1, n, l, it.r).maxAB;
    }
  }
  for (auto &x : sol) {
    assert(x != -1);
    cout << x << "\n";
  }
  return 0;
}

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 18 ms 35540 KB Output is correct
2 Correct 20 ms 35540 KB Output is correct
3 Correct 19 ms 35560 KB Output is correct
4 Correct 19 ms 35516 KB Output is correct
5 Correct 18 ms 35560 KB Output is correct
6 Correct 19 ms 35460 KB Output is correct
7 Correct 19 ms 35576 KB Output is correct
8 Correct 18 ms 35572 KB Output is correct
9 Correct 18 ms 35540 KB Output is correct
10 Correct 19 ms 35564 KB Output is correct

Subtask #2
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 18 ms 35540 KB Output is correct
2 Correct 20 ms 35540 KB Output is correct
3 Correct 19 ms 35560 KB Output is correct
4 Correct 19 ms 35516 KB Output is correct
5 Correct 18 ms 35560 KB Output is correct
6 Correct 19 ms 35460 KB Output is correct
7 Correct 19 ms 35576 KB Output is correct
8 Correct 18 ms 35572 KB Output is correct
9 Correct 18 ms 35540 KB Output is correct
10 Correct 19 ms 35564 KB Output is correct
11 Correct 293 ms 54680 KB Output is correct
12 Correct 302 ms 54604 KB Output is correct
13 Correct 253 ms 54628 KB Output is correct
14 Correct 248 ms 54676 KB Output is correct
15 Correct 258 ms 54804 KB Output is correct
16 Correct 257 ms 54020 KB Output is correct
17 Correct 268 ms 54204 KB Output is correct
18 Correct 256 ms 54012 KB Output is correct
19 Correct 257 ms 54620 KB Output is correct

Subtask #3
27.0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 148 ms 59836 KB Output is correct
2 Correct 89 ms 58304 KB Output is correct
3 Correct 98 ms 56828 KB Output is correct
4 Correct 145 ms 59840 KB Output is correct
5 Correct 151 ms 59852 KB Output is correct
6 Correct 165 ms 59840 KB Output is correct
7 Correct 156 ms 59840 KB Output is correct
8 Correct 142 ms 59860 KB Output is correct
9 Correct 146 ms 59800 KB Output is correct

Subtask #4
54.0 / 54.0

# 결과 실행 시간 메모리 Grader output
1 Correct 18 ms 35540 KB Output is correct
2 Correct 20 ms 35540 KB Output is correct
3 Correct 19 ms 35560 KB Output is correct
4 Correct 19 ms 35516 KB Output is correct
5 Correct 18 ms 35560 KB Output is correct
6 Correct 19 ms 35460 KB Output is correct
7 Correct 19 ms 35576 KB Output is correct
8 Correct 18 ms 35572 KB Output is correct
9 Correct 18 ms 35540 KB Output is correct
10 Correct 19 ms 35564 KB Output is correct
11 Correct 293 ms 54680 KB Output is correct
12 Correct 302 ms 54604 KB Output is correct
13 Correct 253 ms 54628 KB Output is correct
14 Correct 248 ms 54676 KB Output is correct
15 Correct 258 ms 54804 KB Output is correct
16 Correct 257 ms 54020 KB Output is correct
17 Correct 268 ms 54204 KB Output is correct
18 Correct 256 ms 54012 KB Output is correct
19 Correct 257 ms 54620 KB Output is correct
20 Correct 148 ms 59836 KB Output is correct
21 Correct 89 ms 58304 KB Output is correct
22 Correct 98 ms 56828 KB Output is correct
23 Correct 145 ms 59840 KB Output is correct
24 Correct 151 ms 59852 KB Output is correct
25 Correct 165 ms 59840 KB Output is correct
26 Correct 156 ms 59840 KB Output is correct
27 Correct 142 ms 59860 KB Output is correct
28 Correct 146 ms 59800 KB Output is correct
29 Correct 868 ms 120016 KB Output is correct
30 Correct 747 ms 117132 KB Output is correct
31 Correct 706 ms 117096 KB Output is correct
32 Correct 868 ms 123136 KB Output is correct
33 Correct 833 ms 123028 KB Output is correct
34 Correct 859 ms 120836 KB Output is correct
35 Correct 867 ms 120468 KB Output is correct
36 Correct 846 ms 120492 KB Output is correct
37 Correct 882 ms 121920 KB Output is correct
38 Correct 649 ms 127944 KB Output is correct
39 Correct 642 ms 127828 KB Output is correct
40 Correct 642 ms 124528 KB Output is correct
41 Correct 626 ms 124040 KB Output is correct
42 Correct 648 ms 124020 KB Output is correct
43 Correct 629 ms 125764 KB Output is correct
44 Correct 669 ms 127240 KB Output is correct
45 Correct 677 ms 127256 KB Output is correct
46 Correct 660 ms 124100 KB Output is correct
47 Correct 659 ms 123692 KB Output is correct
48 Correct 656 ms 123676 KB Output is correct
49 Correct 673 ms 125728 KB Output is correct
50 Correct 750 ms 125520 KB Output is correct
51 Correct 742 ms 125536 KB Output is correct
52 Correct 754 ms 122988 KB Output is correct
53 Correct 710 ms 122744 KB Output is correct
54 Correct 731 ms 122732 KB Output is correct
55 Correct 743 ms 124404 KB Output is correct