oj.uz

답안 #764474

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
764474 2023-06-23T12:37:08 Z boris_mihov 코끼리 (Dancing Elephants) (IOI11_elephants) C++17
50 / 100
 3643 ms 5932 KB 
#include "elephants.h"
#include <algorithm>
#include <iostream>
#include <numeric>
#include <cassert>
#include <random>
#include <cmath>
#include <vector>
#include <set>
 
typedef long long llong;
const int MAXNUM = 1000000000;
const int BUCKET_SIZE = 20000;
const int MAXN = 150000 + 10;
const int INF  = 2e9;
 
int n, len;
int a[MAXN];
int x[MAXN];
int cycleTo;
int bucketSize;
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;
    bucketSize = 7 * sqrt(n);
    cycleTo = n / bucketSize;

    for (int i = 1 ; i <= n ; ++i)
    {
        x[i] = a[i] = X[i - 1];
    }
 
    for (int i = 1 ; i <= n ; ++i)
    {
        if (!ms.count(a[i])) nums[i / bucketSize].push_back(a[i]);
        ms.insert(a[i]);
    }
 
    for (int i = 0 ; i <= n / bucketSize ; ++i)
    {
        std::sort(nums[i].begin(), nums[i].end());
        fix(i);
    }
}
 
void rebuild()
{
    for (int i = 1 ; i <= n ; ++i)
    {
        a[i] = x[i];
    }
    
    ms.clear();
    for (int i = 0 ; i <= cycleTo ; ++i)
    {   
        nums[i].clear();
    }
 
    std::sort(a + 1, a + 1 + n);
    for (int i = 1 ; i <= n ; ++i)
    {
        if (!ms.count(a[i])) nums[i / bucketSize].push_back(a[i]);
        ms.insert(a[i]);
    }
 
    for (int i = 0 ; i <= cycleTo ; ++i)
    {
        std::sort(nums[i].begin(), nums[i].end());
        fix(i);
    }
}
 
int update(int idx, int y)
{
    for (int i = 0 ; i <= cycleTo ; ++i)
    {
        if (nums[i].size() > n / 4)
        {
            rebuild();
            break;
        }
    }
 
    idx++;
    ms.erase(ms.find(x[idx]));
    if (!ms.count(x[idx]))
    {
        for (int i = 0 ; i <= cycleTo ; ++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;
    if (!ms.count(y))
    {
        bool inserted = false;
        int lastBucket = -1;
    
        for (int i = 0 ; i <= cycleTo ; ++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]);
        }
    }

    ms.insert(y);

    int res = 0;
    int coveredTo = -1;
    for (int bucket = 0 ; bucket <= cycleTo ; ++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:37:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |         if (ptr == nums[idx].size())
      |             ~~~~^~~~~~~~~~~~~~~~~~~
elephants.cpp: In function 'void erase(int, int)':
elephants.cpp:50:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |     for (int i = 0 ; i < nums[idx].size() ; ++i)
      |                      ~~^~~~~~~~~~~~~~~~~~
elephants.cpp: In function 'void insert(int, int)':
elephants.cpp:65:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   65 |     for (int i = 0 ; i < nums[idx].size() ; ++i)
      |                      ~~^~~~~~~~~~~~~~~~~~
elephants.cpp: In function 'int update(int, int)':
elephants.cpp:140:28: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  140 |         if (nums[i].size() > n / 4)
      |             ~~~~~~~~~~~~~~~^~~~~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 1236 KB Output is correct
2 Correct 1 ms 1236 KB Output is correct
3 Correct 1 ms 1236 KB Output is correct

Subtask #2
16.0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 1236 KB Output is correct
2 Correct 1 ms 1236 KB Output is correct
3 Correct 1 ms 1236 KB Output is correct
4 Correct 2 ms 1236 KB Output is correct
5 Correct 2 ms 1236 KB Output is correct
6 Correct 1 ms 1236 KB Output is correct

Subtask #3
24.0 / 24.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 1236 KB Output is correct
2 Correct 1 ms 1236 KB Output is correct
3 Correct 1 ms 1236 KB Output is correct
4 Correct 2 ms 1236 KB Output is correct
5 Correct 2 ms 1236 KB Output is correct
6 Correct 1 ms 1236 KB Output is correct
7 Correct 2542 ms 3276 KB Output is correct
8 Correct 3643 ms 4176 KB Output is correct
9 Correct 516 ms 5628 KB Output is correct
10 Correct 1065 ms 5696 KB Output is correct
11 Correct 1125 ms 5836 KB Output is correct
12 Correct 1334 ms 5932 KB Output is correct
13 Correct 1136 ms 5708 KB Output is correct

Subtask #4
0 / 47.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 1236 KB Output is correct
2 Correct 1 ms 1236 KB Output is correct
3 Correct 1 ms 1236 KB Output is correct
4 Correct 2 ms 1236 KB Output is correct
5 Correct 2 ms 1236 KB Output is correct
6 Correct 1 ms 1236 KB Output is correct
7 Correct 2542 ms 3276 KB Output is correct
8 Correct 3643 ms 4176 KB Output is correct
9 Correct 516 ms 5628 KB Output is correct
10 Correct 1065 ms 5696 KB Output is correct
11 Correct 1125 ms 5836 KB Output is correct
12 Correct 1334 ms 5932 KB Output is correct
13 Correct 1136 ms 5708 KB Output is correct
14 Incorrect 2851 ms 3716 KB Output isn't correct
15 Halted 0 ms 0 KB -

Subtask #5
0 / 3.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 1236 KB Output is correct
2 Correct 1 ms 1236 KB Output is correct
3 Correct 1 ms 1236 KB Output is correct
4 Correct 2 ms 1236 KB Output is correct
5 Correct 2 ms 1236 KB Output is correct
6 Correct 1 ms 1236 KB Output is correct
7 Correct 2542 ms 3276 KB Output is correct
8 Correct 3643 ms 4176 KB Output is correct
9 Correct 516 ms 5628 KB Output is correct
10 Correct 1065 ms 5696 KB Output is correct
11 Correct 1125 ms 5836 KB Output is correct
12 Correct 1334 ms 5932 KB Output is correct
13 Correct 1136 ms 5708 KB Output is correct
14 Incorrect 2851 ms 3716 KB Output isn't correct
15 Halted 0 ms 0 KB -