oj.uz

답안 #859430

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
859430 2023-10-10T07:03:37 Z mgl_diamond 3단 점프 (JOI19_jumps) C++17
100 / 100
 608 ms 39384 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ii = pair<int, int>;
 
#define foru(i, l, r) for(int i=(l); i<=(r); ++i)
#define ford(i, l, r) for(int i=(l); i>=(r); --i)
#define fore(x, v) for(auto &x : v)
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()

void setIO() {
  ios::sync_with_stdio(0);
  cin.tie(0); cout.tie(0);

  if (fopen("input.inp", "r")) {
    freopen("input.inp", "r", stdin);
    freopen("input.out", "w", stdout);
  }
}

const int N = 5e5+5;
int n, q, a[N], ans[N];

// segment tree
int nax[N << 2], cand[N << 2], lazy[N << 2];

void apply(int id) { 
  if (lazy[id] == 0) return;
  int k = id << 1;
  
  lazy[k] = max(lazy[k], lazy[id]);
  cand[k] = max(cand[k], nax[k] + lazy[k]);

  lazy[k+1] = max(lazy[k+1], lazy[id]);
  cand[k+1] = max(cand[k+1], nax[k+1] + lazy[k+1]);

  lazy[id] = 0;
}

void build(int id = 1, int lb = 1, int rb = n) {
  if (lb ^ rb) {
    int k = id << 1, mb = (lb + rb) >> 1;
    build(k, lb, mb);
    build(k+1, mb+1, rb);
    nax[id] = max(nax[k], nax[k+1]);
  }
  else {
    nax[id] = a[lb];
  }
}

void update(int l, int v, int id = 1, int lb = 1, int rb = n) {
  if (l <= lb) {
    lazy[id] = max(lazy[id], v);
    cand[id] = max(cand[id], v + nax[id]);
    return;
  }
  else if (rb < l) {
    return;
  }
  int k = id << 1, mb = (lb + rb) >> 1;
  apply(id);
  update(l, v, k, lb, mb);
  update(l, v, k+1, mb+1, rb);
  cand[id] = max(cand[k], cand[k+1]);
}

int question(int l, int r, int id = 1, int lb = 1, int rb = n) {
  if (l <= lb && rb <= r) {
    return cand[id];
  }
  else if (rb < l || lb > r) {
    return 0;
  }
  int k = id << 1, mb = (lb + rb) >> 1;
  apply(id);
  return max(question(l, r, k, lb, mb), question(l, r, k+1, mb+1, rb));
}

// querys
vector<pair<ii, int>> querys;

int main() {
  setIO();

  cin >> n;
  foru(i, 1, n) cin >> a[i];
  build();

  cin >> q;
  foru(i, 1, q) {
    int l, r;
    cin >> l >> r;
    querys.push_back({{l, r}, i});
  }

  sort(all(querys), greater<pair<ii, int>>());

  stack<int> st;
  int j = 0;
  ford(i, n, 1) {
    while (!st.empty()) {
      int j = st.top();
      if (2*j-i <= n) {
        // cout << "upd " << i << " " << j << " at " << 2*j-i << " value "  << a[i] + a[j] << "\n";
        update(2*j-i, a[i] + a[j]);
      }

      if (a[j] <= a[i]) st.pop();
      else break;
    }
    st.push(i);

    while (j < q && querys[j].first.first == i) {
      auto ask = querys[j];
      int l = ask.first.first, r = ask.first.second, id = ask.second;
      ans[id] = question(l, r);
      // cout << "ques " << l << " " << r << " " << ans[id] << "\n";
      ++j;
    }
  }

  foru(i, 1, q) {
    cout << ans[i] << "\n";
  }
}

Compilation message

jumps.cpp: In function 'void setIO()':
jumps.cpp:17:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |     freopen("input.inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
jumps.cpp:18:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |     freopen("input.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 6488 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6612 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6604 KB Output is correct
7 Correct 1 ms 6492 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct
10 Correct 1 ms 6492 KB Output is correct

Subtask #2
14.0 / 14.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 6488 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6612 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6604 KB Output is correct
7 Correct 1 ms 6492 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct
10 Correct 1 ms 6492 KB Output is correct
11 Correct 252 ms 20408 KB Output is correct
12 Correct 243 ms 20736 KB Output is correct
13 Correct 236 ms 20532 KB Output is correct
14 Correct 245 ms 20560 KB Output is correct
15 Correct 237 ms 20404 KB Output is correct
16 Correct 241 ms 19888 KB Output is correct
17 Correct 239 ms 19896 KB Output is correct
18 Correct 246 ms 19776 KB Output is correct
19 Correct 270 ms 20404 KB Output is correct

Subtask #3
27.0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 86 ms 14164 KB Output is correct
2 Correct 55 ms 15016 KB Output is correct
3 Correct 47 ms 14232 KB Output is correct
4 Correct 83 ms 14164 KB Output is correct
5 Correct 83 ms 14160 KB Output is correct
6 Correct 80 ms 14160 KB Output is correct
7 Correct 89 ms 14056 KB Output is correct
8 Correct 94 ms 14168 KB Output is correct
9 Correct 81 ms 14020 KB Output is correct

Subtask #4
54.0 / 54.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 6488 KB Output is correct
2 Correct 1 ms 6492 KB Output is correct
3 Correct 1 ms 6612 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Correct 1 ms 6604 KB Output is correct
7 Correct 1 ms 6492 KB Output is correct
8 Correct 1 ms 6492 KB Output is correct
9 Correct 1 ms 6492 KB Output is correct
10 Correct 1 ms 6492 KB Output is correct
11 Correct 252 ms 20408 KB Output is correct
12 Correct 243 ms 20736 KB Output is correct
13 Correct 236 ms 20532 KB Output is correct
14 Correct 245 ms 20560 KB Output is correct
15 Correct 237 ms 20404 KB Output is correct
16 Correct 241 ms 19888 KB Output is correct
17 Correct 239 ms 19896 KB Output is correct
18 Correct 246 ms 19776 KB Output is correct
19 Correct 270 ms 20404 KB Output is correct
20 Correct 86 ms 14164 KB Output is correct
21 Correct 55 ms 15016 KB Output is correct
22 Correct 47 ms 14232 KB Output is correct
23 Correct 83 ms 14164 KB Output is correct
24 Correct 83 ms 14160 KB Output is correct
25 Correct 80 ms 14160 KB Output is correct
26 Correct 89 ms 14056 KB Output is correct
27 Correct 94 ms 14168 KB Output is correct
28 Correct 81 ms 14020 KB Output is correct
29 Correct 590 ms 38132 KB Output is correct
30 Correct 461 ms 39384 KB Output is correct
31 Correct 502 ms 37480 KB Output is correct
32 Correct 577 ms 37472 KB Output is correct
33 Correct 580 ms 37496 KB Output is correct
34 Correct 590 ms 36120 KB Output is correct
35 Correct 569 ms 35996 KB Output is correct
36 Correct 608 ms 36244 KB Output is correct
37 Correct 555 ms 36920 KB Output is correct
38 Correct 468 ms 37544 KB Output is correct
39 Correct 480 ms 37424 KB Output is correct
40 Correct 494 ms 35128 KB Output is correct
41 Correct 493 ms 34900 KB Output is correct
42 Correct 466 ms 34692 KB Output is correct
43 Correct 468 ms 35912 KB Output is correct
44 Correct 482 ms 37608 KB Output is correct
45 Correct 480 ms 37688 KB Output is correct
46 Correct 480 ms 35292 KB Output is correct
47 Correct 475 ms 34972 KB Output is correct
48 Correct 495 ms 35196 KB Output is correct
49 Correct 492 ms 36600 KB Output is correct
50 Correct 507 ms 37840 KB Output is correct
51 Correct 528 ms 37952 KB Output is correct
52 Correct 513 ms 35828 KB Output is correct
53 Correct 511 ms 35984 KB Output is correct
54 Correct 519 ms 35824 KB Output is correct
55 Correct 509 ms 36904 KB Output is correct