oj.uz

Submission #556756

# Submission time Handle Problem Language Result Execution time Memory
556756 2022-05-03T21:40:08 Z jeroenodb Teleporters (IOI08_teleporters) C++17
100 / 100
 942 ms 48292 KB 
#pragma GCC optimize("O3")
#include <iostream>
#include <vector>
#include <algorithm>
#include <deque>
#include <set>
#include <string>
#include <numeric>
#include <cmath>
#include <cassert>
#include <array>
#include <numeric>
 
using namespace std;
 
using ll = long long;
 
const ll INF = 1e18;
 
int main()
{
    cin.tie(0)->sync_with_stdio(0);
    int n, m;
    cin >> n >> m;
    vector<pair<int, int>> we(n);
    vector<pair<int, int>> closest;
  	closest.reserve(2*n);
    for (int i = 0; i < n; ++i)
    {
        cin >> we[i].first >> we[i].second;
        closest.push_back({we[i].first, i * 2});
        closest.push_back({we[i].second, i * 2 + 1});
    }
    sort(closest.begin(), closest.end());
    vector<int> adj(2 * n, -1);
    for (int i = 0; i < n; ++i)
    {
        auto it = upper_bound(closest.begin(), closest.end(), pair(we[i].second, (int)1e9));
        if (it != closest.end()) adj[2 * i] = it->second;
        it = upper_bound(closest.begin(), closest.end(), pair(we[i].first, (int)1e9));
        if (it != closest.end()) adj[2 * i + 1] = it->second;
    }
    int start = closest.front().second;
    vector<bool> used(2 * n);
    auto dfs = [&adj, &used](auto self, int v) -> int
    {
      	int res=0;
      	while(v!=-1 and !used[v]) {
          	used[v]=true;
          	v = adj[v];
          	res+=1;
        }
        return res;
    };
    int res = dfs(dfs, start);
    vector<int> comps;
  	comps.reserve(n*2);
    for (int i = 0; i < 2 * n; ++i) if (!used[i]) comps.push_back(dfs(dfs, i));
    sort(comps.rbegin(), comps.rend());
    for (int i = 0; i < min(m, (int)comps.size()); ++i) res += comps[i] + 2;
    m -= (int)comps.size();
    m = max(m, 0);
    res += 2 * (m - m % 2);
    res += m % 2;
    cout << res;
    return 0;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct

Subtask #3
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct

Subtask #4
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct

Subtask #5
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct

Subtask #6
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 316 KB Output is correct

Subtask #7
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct

Subtask #8
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct

Subtask #9
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 316 KB Output is correct

Subtask #10
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct

Subtask #11
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct

Subtask #12
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 340 KB Output is correct
2 Correct 7 ms 724 KB Output is correct

Subtask #13
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 412 KB Output is correct
2 Correct 7 ms 840 KB Output is correct
3 Correct 17 ms 1404 KB Output is correct

Subtask #14
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 852 KB Output is correct

Subtask #15
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 976 KB Output is correct

Subtask #16
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 84 ms 4724 KB Output is correct
2 Correct 222 ms 10360 KB Output is correct

Subtask #17
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 139 ms 7500 KB Output is correct
2 Correct 333 ms 15004 KB Output is correct

Subtask #18
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 510 ms 21704 KB Output is correct
2 Correct 627 ms 26060 KB Output is correct
3 Correct 704 ms 29424 KB Output is correct

Subtask #19
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 790 ms 29448 KB Output is correct
2 Correct 871 ms 32472 KB Output is correct
3 Correct 865 ms 31604 KB Output is correct
4 Correct 852 ms 31924 KB Output is correct

Subtask #20
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 942 ms 34420 KB Output is correct
2 Correct 882 ms 34836 KB Output is correct
3 Correct 421 ms 48292 KB Output is correct
4 Correct 852 ms 48028 KB Output is correct