oj.uz

Submission #764454

# Submission time Handle Problem Language Result Execution time Memory
764454 2023-06-23T12:18:49 Z boris_mihov Dancing Elephants (IOI11_elephants) C++17
50 / 100
 9000 ms 10896 KB 
#include "elephants.h"
#include <algorithm>
#include <iostream>
#include <numeric>
#include <cassert>
#include <random>
#include <vector>
#include <set>

typedef long long llong;
const int MAXNUM = 1000000000;
const int BUCKET_SIZE = 2000;
const int MAXN = 150000 + 10;
const int INF  = 2e9;

int n, len;
int a[MAXN];
int x[MAXN];
std::vector <int> nums[BUCKET_SIZE];
std::vector <std::pair <int,int>> dp[BUCKET_SIZE];

void fix(int idx)
{
    dp[idx].resize(nums[idx].size());
    int ptr = nums[idx].size();

    for (int i = (int)nums[idx].size() - 1 ; i >= 0 ; --i)
    {
        while (ptr > 0 && nums[idx][i] + len < nums[idx][ptr - 1])
        {
            ptr--;
        }

        if (ptr == nums[idx].size())
        {
            dp[idx][i] = {1, nums[idx][i] + len};
        } else
        {
            dp[idx][i] = dp[idx][ptr];
            dp[idx][i].first++;
        }
    }
}

void erase(int idx, int val)
{
    for (int i = 0 ; i < nums[idx].size() ; ++i)
    {
        if (nums[idx][i] == val)
        {
            nums[idx].erase(nums[idx].begin() + i);
            break;
        }
    }

    fix(idx);
}

void insert(int idx, int val)
{
    bool inserted = false;
    for (int i = 0 ; i < nums[idx].size() ; ++i)
    {   
        if (val < nums[idx][i])
        {
            nums[idx].insert(nums[idx].begin() + i, val);
            inserted = true;
            break;
        }
    }   

    if (!inserted)
    {
        nums[idx].push_back(val);
    }

    fix(idx);
}

std::multiset <int> ms;
void init(int N, int L, int X[])
{
    n = N;
    len = L;

    for (int i = 1 ; i <= n ; ++i)
    {
        x[i] = a[i] = X[i - 1];
    }

    for (int i = 1 ; i <= n ; ++i)
    {
        nums[i / BUCKET_SIZE].push_back(a[i]);
    }

    for (int i = 0 ; i < BUCKET_SIZE ; ++i)
    {
        std::sort(nums[i].begin(), nums[i].end());
        fix(i);
    }
}

void rebuild()
{
    for (int i = 1 ; i <= n ; ++i)
    {
        a[i] = x[i];
    }

    for (int i = 0 ; i < BUCKET_SIZE ; ++i)
    {   
        nums[i].clear();
    }

    std::sort(a + 1, a + 1 + n);
    for (int i = 1 ; i <= n ; ++i)
    {
        nums[i / BUCKET_SIZE].push_back(a[i]);
    }

    for (int i = 0 ; i < BUCKET_SIZE ; ++i)
    {
        std::sort(nums[i].begin(), nums[i].end());
        fix(i);
    }
}

int update(int idx, int y)
{
    for (int i = 0 ; i < BUCKET_SIZE ; ++i)
    {
        if (nums[i].size() > n / 3)
        {
            rebuild();
            break;
        }
    }

    idx++;
    for (int i = 0 ; i < BUCKET_SIZE ; ++i)
    {
        if (nums[i].empty())
        {
            continue;
        }

        if (nums[i][0] <= x[idx] && x[idx] <= nums[i].back())
        {
            erase(i, x[idx]);
            break;
        }
    }

    x[idx] = y;
    bool inserted = false;
    int lastBucket = -1;

    for (int i = 0 ; i < BUCKET_SIZE ; ++i)
    {
        if (nums[i].empty())
        {
            continue;
        }

        lastBucket = i;
        if (nums[i][0] <= x[idx] && x[idx] <= nums[i].back())
        {
            inserted = true;
            insert(i, x[idx]);
            break;
        }

        if (nums[i][0] > x[idx])
        {
            inserted = true;
            insert(i, x[idx]);
        }
    }

    if (!inserted)
    {
        insert(lastBucket, x[idx]);
    }

    int res = 0;
    int coveredTo = -1;
    for (int bucket = 0 ; bucket <= 100 ; ++bucket)
    {
        if (nums[bucket].empty())
        {
            continue;
        }

        if (coveredTo >= nums[bucket].back())
        {
            continue;
        }
        
        int l = -1, r = nums[bucket].size() - 1, mid;
        while (l < r - 1)
        {
            mid = (l + r) / 2;
            if (nums[bucket][mid] <= coveredTo) l = mid;
            else r = mid;
        }

        res += dp[bucket][r].first;
        coveredTo = dp[bucket][r].second;
    }

    return res;
}

Compilation message

elephants.cpp: In function 'void fix(int)':
elephants.cpp:34:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |         if (ptr == nums[idx].size())
      |             ~~~~^~~~~~~~~~~~~~~~~~~
elephants.cpp: In function 'void erase(int, int)':
elephants.cpp:47:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |     for (int i = 0 ; i < nums[idx].size() ; ++i)
      |                      ~~^~~~~~~~~~~~~~~~~~
elephants.cpp: In function 'void insert(int, int)':
elephants.cpp:62:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |     for (int i = 0 ; i < nums[idx].size() ; ++i)
      |                      ~~^~~~~~~~~~~~~~~~~~
elephants.cpp: In function 'int update(int, int)':
elephants.cpp:132:28: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  132 |         if (nums[i].size() > n / 3)
      |             ~~~~~~~~~~~~~~~^~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 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 2 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 2 ms 340 KB Output is correct
5 Correct 2 ms 340 KB Output is correct
6 Correct 1 ms 436 KB Output is correct

Subtask #3
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 2 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 2 ms 340 KB Output is correct
5 Correct 2 ms 340 KB Output is correct
6 Correct 1 ms 436 KB Output is correct
7 Correct 1351 ms 1740 KB Output is correct
8 Correct 3036 ms 2072 KB Output is correct
9 Correct 573 ms 2388 KB Output is correct
10 Correct 1238 ms 2600 KB Output is correct
11 Correct 1210 ms 2612 KB Output is correct
12 Correct 1678 ms 2764 KB Output is correct
13 Correct 1271 ms 2612 KB Output is correct

Subtask #4
0 / 47.0

# Verdict Execution time Memory Grader output
1 Correct 2 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 2 ms 340 KB Output is correct
5 Correct 2 ms 340 KB Output is correct
6 Correct 1 ms 436 KB Output is correct
7 Correct 1351 ms 1740 KB Output is correct
8 Correct 3036 ms 2072 KB Output is correct
9 Correct 573 ms 2388 KB Output is correct
10 Correct 1238 ms 2600 KB Output is correct
11 Correct 1210 ms 2612 KB Output is correct
12 Correct 1678 ms 2764 KB Output is correct
13 Correct 1271 ms 2612 KB Output is correct
14 Correct 967 ms 2132 KB Output is correct
15 Correct 938 ms 1852 KB Output is correct
16 Correct 2371 ms 2832 KB Output is correct
17 Correct 2609 ms 3732 KB Output is correct
18 Correct 3869 ms 3532 KB Output is correct
19 Execution timed out 9067 ms 10896 KB Time limit exceeded
20 Halted 0 ms 0 KB -

Subtask #5
0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 2 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 2 ms 340 KB Output is correct
5 Correct 2 ms 340 KB Output is correct
6 Correct 1 ms 436 KB Output is correct
7 Correct 1351 ms 1740 KB Output is correct
8 Correct 3036 ms 2072 KB Output is correct
9 Correct 573 ms 2388 KB Output is correct
10 Correct 1238 ms 2600 KB Output is correct
11 Correct 1210 ms 2612 KB Output is correct
12 Correct 1678 ms 2764 KB Output is correct
13 Correct 1271 ms 2612 KB Output is correct
14 Correct 967 ms 2132 KB Output is correct
15 Correct 938 ms 1852 KB Output is correct
16 Correct 2371 ms 2832 KB Output is correct
17 Correct 2609 ms 3732 KB Output is correct
18 Correct 3869 ms 3532 KB Output is correct
19 Execution timed out 9067 ms 10896 KB Time limit exceeded
20 Halted 0 ms 0 KB -