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답안 #536846

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
536846 2022-03-14T05:54:21 Z phathnv Parkovi (COCI22_parkovi) C++11
50 / 110
 3000 ms 33236 KB 
#include <bits/stdc++.h>
using namespace std;

const int N = 2e5 + 10;

int n, k;
long long dist[N];
array<int, 2> par[N];
vector<array<int, 2>> adj[N];
vector<int> ord;
bool mark[N];

void Dfs1(int u, int p) {
    for (auto [v, c] : adj[u]) {
        if (v == p) {
            continue;
        }
        dist[v] = dist[u] + c;
        par[v] = {u, c};
        Dfs1(v, u);
    }
}

void Dfs2(int u, int p, long long rem) {
    if (rem < 0) {
        return;
    }
    mark[u] = true;
    for (auto [v, c] : adj[u]) {
        if (v == p) {
            continue;
        }
        Dfs2(v, u, rem - c);
    }
}

vector<int> calc(long long r) {
    fill(mark + 1, mark + 1 + n, false);
    vector<int> res;
    for (auto u : ord) {
        if (mark[u]) {
            continue;
        }
        long long rem = r;
        while (par[u][0] && rem >= par[u][1]) {
            rem -= par[u][1];
            u = par[u][0];
        }
        res.push_back(u);
        Dfs2(u, -1, r);
    }
    return res;
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n >> k;
    for (int i = 1; i < n; ++i) {
        int u, v, c;
        cin >> u >> v >> c;
        adj[u].push_back({v, c});
        adj[v].push_back({u, c});
    }
    Dfs1(1, -1);
    ord.resize(n);
    iota(ord.begin(), ord.end(), 1);
    sort(ord.begin(), ord.end(), [&](int u, int v){
            return dist[u] > dist[v];
         });
    long long l = 0, r = 1e15, ans = -1;
    while (l <= r) {
        long long mid = (l + r) >> 1;
        int cnt = calc(mid).size();
        if (cnt <= k) {
            ans = mid;
            r = mid - 1;
        } else {
            l = mid + 1;
        }
    }
    cout << ans << '\n';
    vector<int> tmp = calc(ans);
    fill(mark + 1, mark + 1 + n, false);
    for (auto u : tmp) {
        mark[u] = true;
    }
    for (int i = 1; i <= n; ++i) {
        if (!mark[i] && (int)tmp.size() < k) {
            tmp.push_back(i);
        }
    }
    sort(tmp.begin(), tmp.end());
    for (int x : tmp) {
        cout << x << ' ';
    }
    cout << '\n';
    return 0;
}

Compilation message

Main.cpp: In function 'void Dfs1(int, int)':
Main.cpp:14:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   14 |     for (auto [v, c] : adj[u]) {
      |               ^
Main.cpp: In function 'void Dfs2(int, int, long long int)':
Main.cpp:29:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   29 |     for (auto [v, c] : adj[u]) {
      |               ^

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 2 ms 4948 KB Output is correct
7 Correct 3 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 3 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 4 ms 4948 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 228 ms 29304 KB Output is correct
2 Correct 252 ms 30028 KB Output is correct
3 Correct 267 ms 16936 KB Output is correct
4 Correct 2664 ms 15836 KB Output is correct
5 Correct 2670 ms 15488 KB Output is correct
6 Correct 1188 ms 15432 KB Output is correct
7 Correct 1249 ms 15692 KB Output is correct
8 Correct 1243 ms 16128 KB Output is correct
9 Correct 1243 ms 15820 KB Output is correct
10 Correct 1326 ms 16144 KB Output is correct
11 Correct 902 ms 16972 KB Output is correct
12 Correct 782 ms 17080 KB Output is correct
13 Correct 859 ms 18228 KB Output is correct
14 Correct 703 ms 16844 KB Output is correct
15 Correct 678 ms 19276 KB Output is correct
16 Correct 776 ms 20636 KB Output is correct
17 Correct 875 ms 20028 KB Output is correct

Subtask #3
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 205 ms 30532 KB Output is correct
2 Correct 194 ms 29788 KB Output is correct
3 Correct 204 ms 28488 KB Output is correct
4 Correct 212 ms 28412 KB Output is correct
5 Correct 234 ms 32240 KB Output is correct
6 Correct 248 ms 31156 KB Output is correct
7 Correct 241 ms 32124 KB Output is correct
8 Correct 197 ms 30668 KB Output is correct
9 Correct 200 ms 30496 KB Output is correct
10 Correct 205 ms 29884 KB Output is correct
11 Correct 218 ms 28944 KB Output is correct
12 Correct 258 ms 33236 KB Output is correct
13 Correct 259 ms 33056 KB Output is correct
14 Correct 248 ms 31684 KB Output is correct
15 Correct 217 ms 29832 KB Output is correct
16 Correct 204 ms 28820 KB Output is correct
17 Correct 214 ms 28816 KB Output is correct
18 Correct 231 ms 30192 KB Output is correct
19 Correct 240 ms 31568 KB Output is correct
20 Correct 231 ms 31980 KB Output is correct
21 Correct 232 ms 30792 KB Output is correct

Subtask #4
0 / 60.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 4948 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 2 ms 4948 KB Output is correct
7 Correct 3 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 3 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 4948 KB Output is correct
14 Correct 4 ms 4948 KB Output is correct
15 Correct 228 ms 29304 KB Output is correct
16 Correct 252 ms 30028 KB Output is correct
17 Correct 267 ms 16936 KB Output is correct
18 Correct 2664 ms 15836 KB Output is correct
19 Correct 2670 ms 15488 KB Output is correct
20 Correct 1188 ms 15432 KB Output is correct
21 Correct 1249 ms 15692 KB Output is correct
22 Correct 1243 ms 16128 KB Output is correct
23 Correct 1243 ms 15820 KB Output is correct
24 Correct 1326 ms 16144 KB Output is correct
25 Correct 902 ms 16972 KB Output is correct
26 Correct 782 ms 17080 KB Output is correct
27 Correct 859 ms 18228 KB Output is correct
28 Correct 703 ms 16844 KB Output is correct
29 Correct 678 ms 19276 KB Output is correct
30 Correct 776 ms 20636 KB Output is correct
31 Correct 875 ms 20028 KB Output is correct
32 Correct 205 ms 30532 KB Output is correct
33 Correct 194 ms 29788 KB Output is correct
34 Correct 204 ms 28488 KB Output is correct
35 Correct 212 ms 28412 KB Output is correct
36 Correct 234 ms 32240 KB Output is correct
37 Correct 248 ms 31156 KB Output is correct
38 Correct 241 ms 32124 KB Output is correct
39 Correct 197 ms 30668 KB Output is correct
40 Correct 200 ms 30496 KB Output is correct
41 Correct 205 ms 29884 KB Output is correct
42 Correct 218 ms 28944 KB Output is correct
43 Correct 258 ms 33236 KB Output is correct
44 Correct 259 ms 33056 KB Output is correct
45 Correct 248 ms 31684 KB Output is correct
46 Correct 217 ms 29832 KB Output is correct
47 Correct 204 ms 28820 KB Output is correct
48 Correct 214 ms 28816 KB Output is correct
49 Correct 231 ms 30192 KB Output is correct
50 Correct 240 ms 31568 KB Output is correct
51 Correct 231 ms 31980 KB Output is correct
52 Correct 232 ms 30792 KB Output is correct
53 Execution timed out 3065 ms 19888 KB Time limit exceeded
54 Halted 0 ms 0 KB -