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Submission #736089

# Submission time Handle Problem Language Result Execution time Memory
736089 2023-05-05T08:16:08 Z math_rabbit_1028 Radio Towers (IOI22_towers) C++17
17 / 100
 1008 ms 6980 KB 
#include "towers.h"
#include <bits/stdc++.h>
using namespace std;
ofstream fout("output.txt");

int n;
vector<int> arr;
vector<int> upidx, downidx;

struct localmax {
  int idx, d, l, r;
  bool operator<(const localmax &other) const {
    if (d == other.d) return idx < other.idx;
    return d < other.d;
  }
  void update() {
    d = arr[upidx[idx]] - max(arr[l], arr[r]);
  } 
} local_value[101010];
int adj[101010][2];
set<localmax> local;

vector< pair<int, int> > Dlist;

void init(int N, vector<int> H) {
  n = N;
  for (int i = 0; i < N; i++) arr.push_back(H[i]);
  
  if (arr[0] < arr[1]) downidx.push_back(0);
  for (int i = 1; i < N - 1; i++) {
    if (arr[i] > arr[i - 1] && arr[i] > arr[i + 1]) upidx.push_back(i);
    if (arr[i] < arr[i - 1] && arr[i] < arr[i + 1]) downidx.push_back(i);
  }
  if (arr[N - 1] < arr[N - 2]) downidx.push_back(N - 1);

  for (int i = 0; i < upidx.size(); i++) {
    local_value[i] = {i, 0, downidx[i], downidx[i + 1]};
    local_value[i].update();
    local.insert(local_value[i]);
    adj[i][0] = i - 1;
    adj[i][1] = i + 1;
  }

  while (!local.empty()) {
    localmax now = *local.begin();
    Dlist.push_back({now.d, upidx[now.idx]});
    int next = (arr[now.l] < arr[now.r] ? now.l : now.r);
    local.erase(local.begin());
    if (adj[now.idx][0] >= 0) {
      set<localmax>::iterator iter = local.find(local_value[adj[now.idx][0]]);
      if (iter != local.end()) {
        local.erase(iter);
        local_value[adj[now.idx][0]].r = next;
        local_value[adj[now.idx][0]].update();
        local.insert(local_value[adj[now.idx][0]]);
        adj[adj[now.idx][0]][1] = adj[now.idx][1];
      }
    }
    if (adj[now.idx][1] < upidx.size()) {
      set<localmax>::iterator iter = local.find(local_value[adj[now.idx][1]]);
      if (iter != local.end()) {
        local.erase(iter);
        local_value[adj[now.idx][1]].l = next;
        local_value[adj[now.idx][1]].update();
        local.insert(local_value[adj[now.idx][1]]);
        adj[adj[now.idx][1]][0] = adj[now.idx][0];
      }
    }
  }

  // for (int i = 0; i < Dlist.size(); i++) cout << Dlist[i].first << " " << Dlist[i].second << "\n";

}
 
int max_towers(int L, int R, int D) {
  int ans = Dlist.end() - lower_bound(Dlist.begin(), Dlist.end(), make_pair(D, 0)) + 1;
  return ans;
}

Compilation message

towers.cpp: In function 'void init(int, std::vector<int>)':
towers.cpp:36:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |   for (int i = 0; i < upidx.size(); i++) {
      |                   ~~^~~~~~~~~~~~~~
towers.cpp:59:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |     if (adj[now.idx][1] < upidx.size()) {
      |         ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 241 ms 1076 KB 1st lines differ - on the 1st token, expected: '1', found: '2'
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 336 KB 1st lines differ - on the 1st token, expected: '13', found: '131'
2 Halted 0 ms 0 KB -

Subtask #3
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 336 KB 1st lines differ - on the 1st token, expected: '13', found: '131'
2 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Incorrect 739 ms 5284 KB 1st lines differ - on the 1st token, expected: '11903', found: '33010'
2 Halted 0 ms 0 KB -

Subtask #5
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 292 ms 1560 KB Output is correct
2 Correct 934 ms 5284 KB Output is correct
3 Correct 944 ms 5428 KB Output is correct
4 Correct 830 ms 6960 KB Output is correct
5 Correct 1008 ms 6980 KB Output is correct
6 Correct 758 ms 6960 KB Output is correct
7 Correct 909 ms 6976 KB Output is correct
8 Correct 706 ms 1692 KB Output is correct
9 Correct 683 ms 1704 KB Output is correct
10 Correct 784 ms 1604 KB Output is correct
11 Correct 719 ms 1720 KB Output is correct
12 Correct 48 ms 5312 KB Output is correct
13 Correct 77 ms 6896 KB Output is correct
14 Correct 70 ms 6952 KB Output is correct
15 Correct 17 ms 1712 KB Output is correct
16 Correct 12 ms 1688 KB Output is correct
17 Correct 41 ms 4924 KB Output is correct
18 Correct 46 ms 5360 KB Output is correct
19 Correct 52 ms 5312 KB Output is correct
20 Correct 70 ms 6928 KB Output is correct
21 Correct 63 ms 6844 KB Output is correct
22 Correct 65 ms 6940 KB Output is correct
23 Correct 71 ms 6928 KB Output is correct
24 Correct 12 ms 1712 KB Output is correct
25 Correct 12 ms 1704 KB Output is correct
26 Correct 11 ms 1716 KB Output is correct
27 Correct 11 ms 1708 KB Output is correct
28 Correct 1 ms 336 KB Output is correct
29 Correct 1 ms 336 KB Output is correct
30 Correct 1 ms 336 KB Output is correct
31 Correct 1 ms 336 KB Output is correct
32 Correct 1 ms 336 KB Output is correct
33 Correct 1 ms 336 KB Output is correct
34 Correct 1 ms 336 KB Output is correct
35 Correct 1 ms 336 KB Output is correct
36 Correct 1 ms 336 KB Output is correct
37 Correct 1 ms 336 KB Output is correct
38 Correct 1 ms 336 KB Output is correct
39 Correct 1 ms 336 KB Output is correct
40 Correct 1 ms 336 KB Output is correct
41 Correct 1 ms 336 KB Output is correct
42 Correct 1 ms 336 KB Output is correct
43 Correct 1 ms 336 KB Output is correct

Subtask #6
0 / 19.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 336 KB 1st lines differ - on the 1st token, expected: '13', found: '131'
2 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 241 ms 1076 KB 1st lines differ - on the 1st token, expected: '1', found: '2'
2 Halted 0 ms 0 KB -