oj.uz

Submission #930410

# Submission time Handle Problem Language Result Execution time Memory
930410 2024-02-19T14:54:34 Z boris_mihov Event Hopping 2 (JOI21_event2) C++17
1 / 100
 3000 ms 5580 KB 
#include <algorithm>
#include <iostream>
#include <numeric>
#include <cassert>
#include <cstring>
#include <vector>
#include <queue>
#include <stack>
#include <set>

typedef long long llong;
const int MAXN = 100000 + 10;
const int INF  = 2e9;

int n, k;
int l[MAXN];
int r[MAXN];
int perm[MAXN];

std::vector <int> sol;
std::vector <int> ans;
std::vector <int> remaining;

bool intersecting(int x, int y)
{
    return std::max(l[x], l[y]) < std::min(r[x], r[y]);
}

int canAdd(int idx)
{
    int cntLeft = sol.size();
    for (const int &i : ans)
    {
        if (intersecting(idx, i))
        {
            return -1;
        }
    }

    int maxPopped = 0;
    for (const int &i : sol)
    {
        if (intersecting(idx, i))
        {
            // std::cout << "intersects with: " << l[i] << ' ' << r[i] << '\n';
            maxPopped = std::max(maxPopped, r[i]);
            cntLeft--;
        }
    }

    int coolIdx = 0;
    for (const int &i : remaining)
    {
        if (l[i] >= r[idx] && r[i] <= maxPopped)
        {
            // std::cout << coolUIDx
            assert(coolIdx == 0);
            coolIdx = i;
        }
    }
    
    // std::cout << "cool idx is: " << coolIdx << '\n';
    if  ((coolIdx > 0) + cntLeft + ans.size() + 1 >= k)
    {
        return coolIdx;
    } else
    {
        return -1;
    }
}

void removeIntersecting(int idx)
{
    std::vector <int> sol2;
    for (const int &i : sol)
    {
        if (!intersecting(idx, i))
        {
            sol2.push_back(i);
        }
    }

    sol = sol2;

    std::vector <int> rem2;
    for (const int &i : remaining)
    {
        if (!intersecting(idx, i))
        {
            rem2.push_back(i);
        }
    }

    remaining = rem2;
}

void solve()
{
    std::vector <std::pair <int, std::pair <int,bool>>> v;
    for (int i = 1 ; i <= n ; ++i)
    {
        v.push_back({l[i], {i, false}});
        v.push_back({r[i], {i, true}});
    }
    
    int cnt = 0;
    int last = 0;
    std::sort(v.begin(), v.end());
    for (int i = 0 ; i < 2 * n ; ++i)
    {
        cnt += (v[i].first > last);
        last = v[i].first;

        if (v[i].second.second) r[v[i].second.first] = cnt;
        else l[v[i].second.first] = cnt;
    }

    // std::cout << n << ' ' << k << '\n';
    // for (int i = 1 ; i <= n ; ++i)
    // {
    //     std::cout << l[i] << ' ' << r[i] << '\n';
    // }

    std::iota(perm + 1, perm + 1 + n, 1);
    std::sort(perm + 1, perm + 1 + n, [&](int x, int y)
    {
        return r[x] < r[y] || (r[x] == r[y] && l[x] > l[y]);  
    });

    for (int i = 1 ; i <= n ; ++i)
    {
        if (sol.empty() || !intersecting(sol.back(), perm[i]))
        {
            sol.push_back(perm[i]);
        } else
        {
            remaining.push_back(perm[i]);
        }
    }

    if (sol.size() < k)
    {
        std::cout << -1 << '\n';
        return;
    }

    // std::cout << "sol is\n";
    // for (const int &idx : sol)
    // {
    //     std::cout << idx << ' ' << l[idx] << ' ' << r[idx] << '\n';
    // }

    for (int i = 1 ; i <= n && ans.size() < k ; ++i)
    {
        int res = canAdd(i);
        // std::cout << "res: " << res << 
        if (res != -1)
        {
            ans.push_back(i);
            removeIntersecting(i);
            if (res != 0)
            {
                // std::cout << "bonus: " << i << ' ' << res << '\n';
                sol.push_back(res);
                for (int &i : remaining)
                {
                    if (i == res)
                    {
                        std::swap(i, remaining.back());
                        remaining.pop_back();
                        break;
                    }
                }
            }
        }
    }

    for (const int &idx : ans)
    {
        std::cout << idx << '\n';
    }
}

void input()
{
    std::cin >> n >> k;
    for (int i = 1 ; i <= n ; ++i)
    {
        std::cin >> l[i] >> r[i];
        // l[i]++;
    }
}

void fastIOI()
{
    std::ios_base :: sync_with_stdio(0);
    std::cout.tie(nullptr);
    std::cin.tie(nullptr);
}   

int main()
{
    fastIOI();
    input();
    solve();

    return 0;
}

Compilation message

event2.cpp: In function 'int canAdd(int)':
event2.cpp:63:51: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   63 |     if  ((coolIdx > 0) + cntLeft + ans.size() + 1 >= k)
      |          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
event2.cpp: In function 'void solve()':
event2.cpp:141:20: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  141 |     if (sol.size() < k)
      |         ~~~~~~~~~~~^~~
event2.cpp:153:43: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  153 |     for (int i = 1 ; i <= n && ans.size() < k ; ++i)
      |                                ~~~~~~~~~~~^~~

Subtask #1
0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Execution timed out 3086 ms 5580 KB Time limit exceeded
5 Halted 0 ms 0 KB -

Subtask #2
1.0 / 1.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 544 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 344 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 0 ms 344 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 344 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct

Subtask #3
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 544 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 0 ms 344 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 344 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 344 KB Output is correct
12 Correct 0 ms 344 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 344 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 348 KB Output is correct
28 Incorrect 2 ms 604 KB Output isn't correct
29 Halted 0 ms 0 KB -

Subtask #4
0 / 61.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Execution timed out 3086 ms 5580 KB Time limit exceeded
5 Halted 0 ms 0 KB -