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답안 #536847

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
536847 2022-03-14T05:57:52 Z phathnv Parkovi (COCI22_parkovi) C++11
50 / 110
 3000 ms 31780 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], choose[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);
    }
}

int calc(long long r) {
    fill(mark + 1, mark + 1 + n, false);
    fill(choose + 1, choose + 1 + n, false);
    int res = 0;
    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;
        choose[u] = true;
        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);
        if (cnt <= k) {
            ans = mid;
            r = mid - 1;
        } else {
            l = mid + 1;
        }
    }
    cout << ans << '\n';
    int cnt = calc(ans);
    for (int i = 1; i <= n; ++i) {
        if (!choose[i] && cnt < k) {
            ++cnt;
            choose[i] = true;
        }
    }
    for (int i = 1; i <= n; ++i) {
        if (choose[i]) {
            cout << i << ' ';
        }
    }
    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 2 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 2 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 3 ms 4948 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 221 ms 29504 KB Output is correct
2 Correct 239 ms 30188 KB Output is correct
3 Correct 275 ms 17028 KB Output is correct
4 Correct 2436 ms 15948 KB Output is correct
5 Correct 2473 ms 15692 KB Output is correct
6 Correct 1079 ms 15680 KB Output is correct
7 Correct 1064 ms 15796 KB Output is correct
8 Correct 1169 ms 16384 KB Output is correct
9 Correct 1248 ms 16092 KB Output is correct
10 Correct 1290 ms 16216 KB Output is correct
11 Correct 906 ms 17100 KB Output is correct
12 Correct 781 ms 17272 KB Output is correct
13 Correct 847 ms 18380 KB Output is correct
14 Correct 701 ms 17140 KB Output is correct
15 Correct 669 ms 16704 KB Output is correct
16 Correct 783 ms 17296 KB Output is correct
17 Correct 867 ms 16716 KB Output is correct

Subtask #3
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 205 ms 30688 KB Output is correct
2 Correct 194 ms 29940 KB Output is correct
3 Correct 196 ms 28624 KB Output is correct
4 Correct 219 ms 28564 KB Output is correct
5 Correct 209 ms 30684 KB Output is correct
6 Correct 253 ms 30380 KB Output is correct
7 Correct 232 ms 31312 KB Output is correct
8 Correct 206 ms 30852 KB Output is correct
9 Correct 198 ms 30556 KB Output is correct
10 Correct 212 ms 30032 KB Output is correct
11 Correct 214 ms 29132 KB Output is correct
12 Correct 238 ms 31584 KB Output is correct
13 Correct 240 ms 31780 KB Output is correct
14 Correct 236 ms 31088 KB Output is correct
15 Correct 213 ms 30012 KB Output is correct
16 Correct 206 ms 29072 KB Output is correct
17 Correct 215 ms 28964 KB Output is correct
18 Correct 245 ms 30228 KB Output is correct
19 Correct 226 ms 29900 KB Output is correct
20 Correct 239 ms 30668 KB Output is correct
21 Correct 233 ms 30028 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 2 ms 4948 KB Output is correct
10 Correct 3 ms 4948 KB Output is correct
11 Correct 2 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 3 ms 4948 KB Output is correct
15 Correct 221 ms 29504 KB Output is correct
16 Correct 239 ms 30188 KB Output is correct
17 Correct 275 ms 17028 KB Output is correct
18 Correct 2436 ms 15948 KB Output is correct
19 Correct 2473 ms 15692 KB Output is correct
20 Correct 1079 ms 15680 KB Output is correct
21 Correct 1064 ms 15796 KB Output is correct
22 Correct 1169 ms 16384 KB Output is correct
23 Correct 1248 ms 16092 KB Output is correct
24 Correct 1290 ms 16216 KB Output is correct
25 Correct 906 ms 17100 KB Output is correct
26 Correct 781 ms 17272 KB Output is correct
27 Correct 847 ms 18380 KB Output is correct
28 Correct 701 ms 17140 KB Output is correct
29 Correct 669 ms 16704 KB Output is correct
30 Correct 783 ms 17296 KB Output is correct
31 Correct 867 ms 16716 KB Output is correct
32 Correct 205 ms 30688 KB Output is correct
33 Correct 194 ms 29940 KB Output is correct
34 Correct 196 ms 28624 KB Output is correct
35 Correct 219 ms 28564 KB Output is correct
36 Correct 209 ms 30684 KB Output is correct
37 Correct 253 ms 30380 KB Output is correct
38 Correct 232 ms 31312 KB Output is correct
39 Correct 206 ms 30852 KB Output is correct
40 Correct 198 ms 30556 KB Output is correct
41 Correct 212 ms 30032 KB Output is correct
42 Correct 214 ms 29132 KB Output is correct
43 Correct 238 ms 31584 KB Output is correct
44 Correct 240 ms 31780 KB Output is correct
45 Correct 236 ms 31088 KB Output is correct
46 Correct 213 ms 30012 KB Output is correct
47 Correct 206 ms 29072 KB Output is correct
48 Correct 215 ms 28964 KB Output is correct
49 Correct 245 ms 30228 KB Output is correct
50 Correct 226 ms 29900 KB Output is correct
51 Correct 239 ms 30668 KB Output is correct
52 Correct 233 ms 30028 KB Output is correct
53 Execution timed out 3076 ms 15964 KB Time limit exceeded
54 Halted 0 ms 0 KB -