oj.uz

Submission #600179

# Submission time Handle Problem Language Result Execution time Memory
600179 2022-07-20T13:55:59 Z MilosMilutinovic Dancing Elephants (IOI11_elephants) C++14
100 / 100
 6494 ms 11540 KB 
/**
 *    author:  wxhtzdy
 *    created: 20.07.2022 11:59:55
**/
#include "elephants.h"
#include <bits/stdc++.h>
 
using namespace std;
 
const int MAX = 150005;
const int BLOCK = sqrt(MAX);
 
int n, l, x[MAX], cnt[MAX], pos[MAX];
int id[MAX], order[MAX];
 
vector<int> idx[MAX / BLOCK + 5];
 
void BuildBlock(int i) {
  int sz = (int) idx[i].size();
  int ptr = sz - 1;    
  for (int j = sz - 1; j >= 0; j--) {
    if (x[idx[i][sz - 1]] - x[idx[i][j]] <= l) {
      cnt[idx[i][j]] = 1;
      pos[idx[i][j]] = x[idx[i][j]] + l;
    } else { 
      while (x[idx[i][ptr]] - x[idx[i][j]] > l) {
        ptr -= 1;
      }
      cnt[idx[i][j]] = cnt[idx[i][ptr + 1]] + 1;
      pos[idx[i][j]] = pos[idx[i][ptr + 1]];
    }                              
  }
}
 
void Build() {     
  for (int i = 0; i < n; i++) {
    order[i] = i;
  }
  sort(order, order + n, [&](int i, int j) {
    return x[i] < x[j];
  });
  for (int i = 0; i <= n / BLOCK; i++) {
    idx[i].clear();
  }
  for (int i = 0; i < n; i++) {
    id[order[i]] = i / BLOCK;
    idx[id[order[i]]].push_back(order[i]);
  }
  for (int i = 0; i <= n / BLOCK; i++) {
    BuildBlock(i);
  }
}
 
int Q;
 
int update(int i, int y) {
  ++Q;
  x[i] = y;
  if (Q == 2 * BLOCK) {
    Build();
    Q = 0;
  } else {
    vector<int> b;
    for (int j = 0; j < (int) idx[id[i]].size(); j++) {
      if (idx[id[i]][j] != i) {      
        b.push_back(idx[id[i]][j]);
      }
    }
    idx[id[i]] = b;
    BuildBlock(id[i]);
    b.clear();
    id[i] = 0;
    for (int j = n / BLOCK; j >= 0; j--) {
      if (!idx[j].empty() && x[idx[j][0]] <= x[i]) {
        id[i] = j;
        break;
      } 
    }        
    if (idx[id[i]].empty() || x[idx[id[i]].back()] < y) {
      idx[id[i]].push_back(i);
    } else {
      vector<int> b;    
      for (int j = 0; j < (int) idx[id[i]].size(); j++) {
        if (y <= x[idx[id[i]][j]]) {
          b.push_back(i);
          y = (int) 1.01e9;
          j -= 1;
        } else {
          b.push_back(idx[id[i]][j]);
        }
      }
      idx[id[i]] = b;
    }
    BuildBlock(id[i]);
  } 
  int ans = 0, R = -1;
  for (int j = 0; j <= n / BLOCK; j++) {
    if (idx[j].empty() || x[idx[j].back()] <= R) {
      continue;
    }                                          
    int low = 0, high = (int) idx[j].size() - 1, at = 0;
    while (low <= high) {
      int mid = low + high >> 1;
      if (x[idx[j][mid]] > R) {
        at = mid;
        high = mid - 1;
      } else {
        low = mid + 1;
      }
    }
    ans += cnt[idx[j][at]];
    R = pos[idx[j][at]];
  }
  return ans; 
}
 
void init(int N, int L, int* X) {
  n = N;
  l = L;
  for (int i = 0; i < n; i++) {
    x[i] = X[i];
  }
  Build();
}

Compilation message

elephants.cpp: In function 'int update(int, int)':
elephants.cpp:103:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  103 |       int mid = low + high >> 1;
      |                 ~~~~^~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 264 KB Output is correct
6 Correct 1 ms 340 KB Output is correct

Subtask #3
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 264 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 505 ms 2196 KB Output is correct
8 Correct 532 ms 2336 KB Output is correct
9 Correct 645 ms 3924 KB Output is correct
10 Correct 524 ms 3704 KB Output is correct
11 Correct 520 ms 3644 KB Output is correct
12 Correct 1014 ms 3812 KB Output is correct
13 Correct 522 ms 3496 KB Output is correct

Subtask #4
47.0 / 47.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 264 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 505 ms 2196 KB Output is correct
8 Correct 532 ms 2336 KB Output is correct
9 Correct 645 ms 3924 KB Output is correct
10 Correct 524 ms 3704 KB Output is correct
11 Correct 520 ms 3644 KB Output is correct
12 Correct 1014 ms 3812 KB Output is correct
13 Correct 522 ms 3496 KB Output is correct
14 Correct 761 ms 3372 KB Output is correct
15 Correct 795 ms 3248 KB Output is correct
16 Correct 1576 ms 4408 KB Output is correct
17 Correct 1717 ms 5228 KB Output is correct
18 Correct 1821 ms 5172 KB Output is correct
19 Correct 1369 ms 5368 KB Output is correct
20 Correct 1742 ms 5228 KB Output is correct
21 Correct 1721 ms 5200 KB Output is correct
22 Correct 965 ms 4788 KB Output is correct

Subtask #5
3.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 264 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 505 ms 2196 KB Output is correct
8 Correct 532 ms 2336 KB Output is correct
9 Correct 645 ms 3924 KB Output is correct
10 Correct 524 ms 3704 KB Output is correct
11 Correct 520 ms 3644 KB Output is correct
12 Correct 1014 ms 3812 KB Output is correct
13 Correct 522 ms 3496 KB Output is correct
14 Correct 761 ms 3372 KB Output is correct
15 Correct 795 ms 3248 KB Output is correct
16 Correct 1576 ms 4408 KB Output is correct
17 Correct 1717 ms 5228 KB Output is correct
18 Correct 1821 ms 5172 KB Output is correct
19 Correct 1369 ms 5368 KB Output is correct
20 Correct 1742 ms 5228 KB Output is correct
21 Correct 1721 ms 5200 KB Output is correct
22 Correct 965 ms 4788 KB Output is correct
23 Correct 3645 ms 11404 KB Output is correct
24 Correct 3952 ms 11408 KB Output is correct
25 Correct 3195 ms 11328 KB Output is correct
26 Correct 4070 ms 11420 KB Output is correct
27 Correct 4988 ms 11284 KB Output is correct
28 Correct 1914 ms 5172 KB Output is correct
29 Correct 1854 ms 5052 KB Output is correct
30 Correct 1824 ms 5264 KB Output is correct
31 Correct 1815 ms 5180 KB Output is correct
32 Correct 3137 ms 10868 KB Output is correct
33 Correct 2977 ms 10188 KB Output is correct
34 Correct 3545 ms 11056 KB Output is correct
35 Correct 2965 ms 11356 KB Output is correct
36 Correct 2436 ms 10840 KB Output is correct
37 Correct 6494 ms 11540 KB Output is correct
38 Correct 3905 ms 10060 KB Output is correct
39 Correct 4944 ms 11112 KB Output is correct
40 Correct 3818 ms 10084 KB Output is correct
41 Correct 6004 ms 11000 KB Output is correct
42 Correct 6143 ms 11092 KB Output is correct