oj.uz

Submission #424895

# Submission time Handle Problem Language Result Execution time Memory
424895 2021-06-12T11:18:00 Z Mamnoon_Siam Two Antennas (JOI19_antennas) C++17
13 / 100
 3000 ms 16620 KB 
// https://codeforces.com/blog/entry/66022?#comment-500622

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

using ll = long long;
using ii = pair<int, int>;
using vi = vector<int>;
#define all(v) begin(v), end(v)
#define sz(v) (int)(v).size()
#define fi first
#define se second

const int inf = 1e9 + 9;

struct Node {
  vector<int> c, d;
  Node(int _, int n) {
    c.assign(n, -inf);
    d.assign(n, -inf);
  }
  void update_ci(int pos, int val) {
    c[pos-1] = val;
  }
  void update_di(int L, int R, int val) {
    for(int i = L-1; i < R; ++i) {
      d[i] = max(d[i], c[i] + val);
    }
  }
  int get_max_di(int L, int R) {
    int ret = -inf;
    for(int i = L-1; i < R; ++i) {
      ret = max(ret, d[i]);
    } return ret;
  }
};

/*struct Node {
  Node *l = 0, *r = 0;
  int mx_di = -inf, mx_ci = -inf;
  int lo, hi;
  int lz = -inf;
  Node(int _lo, int _hi) : lo(_lo), hi(_hi) {
    if(lo < hi) {
      int mid = (lo + hi) >> 1;
      l = new Node(lo, mid);
      r = new Node(mid+1, hi);
    }
  }
  void upd(int val) {
    lz = max(lz, val);
    mx_di = max(mx_di, mx_ci + lz);
  }
  void push() {
    if(lo < hi) {
      l -> upd(lz);
      r -> upd(lz);
    }
    lz = -inf;
  }
  void update_ci(int pos, int ci) {
    if(lo == hi) {
      mx_ci = ci;
    } else {
      push();
      if(pos <= l -> hi)
        l -> update_ci(pos, ci);
      else
        r -> update_ci(pos, ci);
      mx_ci = max(l -> mx_ci, r -> mx_ci);
    }
  }
  void update_di(int L, int R, int val) { // do d[i] max= c[i] + val, val negative in this problem
    if(hi < L or lo > R) return;
    if(L <= lo and hi <= R) {
      upd(val);
    } else {
      push();
      l -> update_di(L, R, val);
      r -> update_di(L, R, val);
      mx_di = max(l -> mx_di, r -> mx_di);
    }
  }
  int get_max_di(int L, int R) { // max{ d[i] | i \in [L, R] }
    if(hi < L or lo > R) return -inf;
    if(L <= lo and hi <= R) return mx_di;
    push();
    return max(l->get_max_di(L,R), r->get_max_di(L,R));
  }
};*/

const int N = 2e5 + 5;

int n, q;
int H[N], A[N], B[N];
int ans[N];
int L[N], R[N];

void solve() {
  vector<vi> offline(n+2), queries_w_R_at(n+1);
  for(int i = 1; i <= q; ++i) {
    queries_w_R_at[R[i]].emplace_back(i);
  }
  for(int i = 1; i <= n; ++i) {
    offline[min(n+1, i + A[i])].emplace_back(i);
    offline[min(n+1, i + B[i] + 1)].emplace_back(-i);
  }
  Node *tr = new Node(1, n);
  for(int i = 1; i <= n; ++i) {
    for(int j : offline[i]) {
      if(j < 0) { // del
        tr -> update_ci(-j, -inf);
      } else { // ins
        tr -> update_ci(j, H[j]);
      }
    }
    if(i - A[i] >= 1) {
      tr -> update_di(max(1, i - B[i]), i - A[i], -H[i]);
    }
    for(int j : queries_w_R_at[i]) {
      ans[j] = max(ans[j], tr -> get_max_di(L[j], R[j]));
    }
  }
}

int main(int argc, char const *argv[])
{
#ifdef LOCAL
  freopen("in", "r", stdin);
#endif
  fill(ans, ans+N, -inf);
  scanf("%d", &n);
  for(int i = 1; i <= n; ++i) {
    scanf("%d %d %d", &H[i], &A[i], &B[i]);
  }
  scanf("%d", &q);
  for(int i = 1; i <= q; ++i) {
    scanf("%d %d", &L[i], &R[i]);
  }
  solve();
  for(int i = 1, j = n; i < j; ++i, --j) {
    swap(H[i], H[j]);
    swap(A[i], A[j]);
    swap(B[i], B[j]);
  }
  for(int i = 1; i <= q; ++i) {
    L[i] = n - L[i] + 1;
    R[i] = n - R[i] + 1;
    swap(L[i], R[i]);
  }
  solve();
  for(int i = 1; i <= q; ++i) {
    printf("%d\n", ans[i] < 0 ? -1 : ans[i]);
  }
  return 0;
}
/*
* use std::array instead of std::vector, if u can
* overflow?
* array bounds
*/

Compilation message

antennas.cpp: In function 'int main(int, const char**)':
antennas.cpp:132:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  132 |   scanf("%d", &n);
      |   ~~~~~^~~~~~~~~~
antennas.cpp:134:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  134 |     scanf("%d %d %d", &H[i], &A[i], &B[i]);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
antennas.cpp:136:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  136 |   scanf("%d", &q);
      |   ~~~~~^~~~~~~~~~
antennas.cpp:138:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  138 |     scanf("%d %d", &L[i], &R[i]);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
2.0 / 2.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1100 KB Output is correct
2 Correct 1 ms 1100 KB Output is correct
3 Correct 1 ms 1096 KB Output is correct
4 Correct 1 ms 1100 KB Output is correct
5 Correct 1 ms 1100 KB Output is correct
6 Correct 1 ms 1100 KB Output is correct
7 Correct 1 ms 1100 KB Output is correct
8 Correct 1 ms 1076 KB Output is correct
9 Correct 1 ms 1100 KB Output is correct
10 Correct 1 ms 1100 KB Output is correct
11 Correct 1 ms 1092 KB Output is correct
12 Correct 1 ms 1100 KB Output is correct
13 Correct 2 ms 1092 KB Output is correct
14 Correct 1 ms 1100 KB Output is correct
15 Correct 1 ms 1100 KB Output is correct
16 Correct 1 ms 1100 KB Output is correct
17 Correct 1 ms 1100 KB Output is correct
18 Correct 1 ms 1100 KB Output is correct
19 Correct 1 ms 1100 KB Output is correct
20 Correct 1 ms 1100 KB Output is correct
21 Correct 1 ms 1100 KB Output is correct
22 Correct 1 ms 1100 KB Output is correct
23 Correct 1 ms 1100 KB Output is correct
24 Correct 1 ms 1100 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1100 KB Output is correct
2 Correct 1 ms 1100 KB Output is correct
3 Correct 1 ms 1096 KB Output is correct
4 Correct 1 ms 1100 KB Output is correct
5 Correct 1 ms 1100 KB Output is correct
6 Correct 1 ms 1100 KB Output is correct
7 Correct 1 ms 1100 KB Output is correct
8 Correct 1 ms 1076 KB Output is correct
9 Correct 1 ms 1100 KB Output is correct
10 Correct 1 ms 1100 KB Output is correct
11 Correct 1 ms 1092 KB Output is correct
12 Correct 1 ms 1100 KB Output is correct
13 Correct 2 ms 1092 KB Output is correct
14 Correct 1 ms 1100 KB Output is correct
15 Correct 1 ms 1100 KB Output is correct
16 Correct 1 ms 1100 KB Output is correct
17 Correct 1 ms 1100 KB Output is correct
18 Correct 1 ms 1100 KB Output is correct
19 Correct 1 ms 1100 KB Output is correct
20 Correct 1 ms 1100 KB Output is correct
21 Correct 1 ms 1100 KB Output is correct
22 Correct 1 ms 1100 KB Output is correct
23 Correct 1 ms 1100 KB Output is correct
24 Correct 1 ms 1100 KB Output is correct
25 Correct 134 ms 5704 KB Output is correct
26 Correct 26 ms 1740 KB Output is correct
27 Correct 301 ms 7528 KB Output is correct
28 Correct 318 ms 7620 KB Output is correct
29 Correct 143 ms 5828 KB Output is correct
30 Correct 212 ms 5616 KB Output is correct
31 Correct 111 ms 6060 KB Output is correct
32 Correct 325 ms 7552 KB Output is correct
33 Correct 256 ms 7364 KB Output is correct
34 Correct 155 ms 4428 KB Output is correct
35 Correct 251 ms 7748 KB Output is correct
36 Correct 318 ms 7584 KB Output is correct
37 Correct 174 ms 4360 KB Output is correct
38 Correct 318 ms 6796 KB Output is correct
39 Correct 44 ms 2116 KB Output is correct
40 Correct 306 ms 6700 KB Output is correct
41 Correct 228 ms 5428 KB Output is correct
42 Correct 321 ms 6692 KB Output is correct
43 Correct 104 ms 3056 KB Output is correct
44 Correct 315 ms 6652 KB Output is correct
45 Correct 53 ms 2348 KB Output is correct
46 Correct 314 ms 6668 KB Output is correct
47 Correct 79 ms 2636 KB Output is correct
48 Correct 311 ms 6700 KB Output is correct

Subtask #3
0 / 22.0

# Verdict Execution time Memory Grader output
1 Execution timed out 3080 ms 16620 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1100 KB Output is correct
2 Correct 1 ms 1100 KB Output is correct
3 Correct 1 ms 1096 KB Output is correct
4 Correct 1 ms 1100 KB Output is correct
5 Correct 1 ms 1100 KB Output is correct
6 Correct 1 ms 1100 KB Output is correct
7 Correct 1 ms 1100 KB Output is correct
8 Correct 1 ms 1076 KB Output is correct
9 Correct 1 ms 1100 KB Output is correct
10 Correct 1 ms 1100 KB Output is correct
11 Correct 1 ms 1092 KB Output is correct
12 Correct 1 ms 1100 KB Output is correct
13 Correct 2 ms 1092 KB Output is correct
14 Correct 1 ms 1100 KB Output is correct
15 Correct 1 ms 1100 KB Output is correct
16 Correct 1 ms 1100 KB Output is correct
17 Correct 1 ms 1100 KB Output is correct
18 Correct 1 ms 1100 KB Output is correct
19 Correct 1 ms 1100 KB Output is correct
20 Correct 1 ms 1100 KB Output is correct
21 Correct 1 ms 1100 KB Output is correct
22 Correct 1 ms 1100 KB Output is correct
23 Correct 1 ms 1100 KB Output is correct
24 Correct 1 ms 1100 KB Output is correct
25 Correct 134 ms 5704 KB Output is correct
26 Correct 26 ms 1740 KB Output is correct
27 Correct 301 ms 7528 KB Output is correct
28 Correct 318 ms 7620 KB Output is correct
29 Correct 143 ms 5828 KB Output is correct
30 Correct 212 ms 5616 KB Output is correct
31 Correct 111 ms 6060 KB Output is correct
32 Correct 325 ms 7552 KB Output is correct
33 Correct 256 ms 7364 KB Output is correct
34 Correct 155 ms 4428 KB Output is correct
35 Correct 251 ms 7748 KB Output is correct
36 Correct 318 ms 7584 KB Output is correct
37 Correct 174 ms 4360 KB Output is correct
38 Correct 318 ms 6796 KB Output is correct
39 Correct 44 ms 2116 KB Output is correct
40 Correct 306 ms 6700 KB Output is correct
41 Correct 228 ms 5428 KB Output is correct
42 Correct 321 ms 6692 KB Output is correct
43 Correct 104 ms 3056 KB Output is correct
44 Correct 315 ms 6652 KB Output is correct
45 Correct 53 ms 2348 KB Output is correct
46 Correct 314 ms 6668 KB Output is correct
47 Correct 79 ms 2636 KB Output is correct
48 Correct 311 ms 6700 KB Output is correct
49 Execution timed out 3080 ms 16620 KB Time limit exceeded
50 Halted 0 ms 0 KB -