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답안 #536849

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
536849 2022-03-14T05:59:53 Z phathnv Parkovi (COCI22_parkovi) C++11
50 / 110
 3000 ms 33356 KB 
#include <bits/stdc++.h>
using namespace std;

const int N = 2e5 + 10;

int n, k;
long long dist[N], maxRem[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 <= maxRem[u]) {
        return;
    }
    maxRem[u] = rem;
    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);
    fill(maxRem + 1, maxRem + 1 + n, -1);
    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:30:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   30 |     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 3 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 2 ms 4948 KB Output is correct
14 Correct 2 ms 4948 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 275 ms 31032 KB Output is correct
2 Correct 283 ms 31692 KB Output is correct
3 Correct 353 ms 18636 KB Output is correct
4 Correct 1671 ms 17488 KB Output is correct
5 Correct 1559 ms 17080 KB Output is correct
6 Correct 1145 ms 17080 KB Output is correct
7 Correct 1326 ms 17168 KB Output is correct
8 Correct 1348 ms 17880 KB Output is correct
9 Correct 1763 ms 17524 KB Output is correct
10 Correct 1503 ms 17768 KB Output is correct
11 Correct 985 ms 18656 KB Output is correct
12 Correct 931 ms 18636 KB Output is correct
13 Correct 1000 ms 19952 KB Output is correct
14 Correct 843 ms 18532 KB Output is correct
15 Correct 799 ms 18172 KB Output is correct
16 Correct 900 ms 18748 KB Output is correct
17 Correct 941 ms 18124 KB Output is correct

Subtask #3
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 210 ms 32264 KB Output is correct
2 Correct 201 ms 31472 KB Output is correct
3 Correct 212 ms 30132 KB Output is correct
4 Correct 248 ms 30016 KB Output is correct
5 Correct 208 ms 32108 KB Output is correct
6 Correct 224 ms 31852 KB Output is correct
7 Correct 232 ms 32808 KB Output is correct
8 Correct 212 ms 32440 KB Output is correct
9 Correct 194 ms 32124 KB Output is correct
10 Correct 235 ms 31568 KB Output is correct
11 Correct 243 ms 30564 KB Output is correct
12 Correct 237 ms 33116 KB Output is correct
13 Correct 225 ms 33356 KB Output is correct
14 Correct 261 ms 32592 KB Output is correct
15 Correct 246 ms 31624 KB Output is correct
16 Correct 254 ms 30448 KB Output is correct
17 Correct 248 ms 30372 KB Output is correct
18 Correct 307 ms 31772 KB Output is correct
19 Correct 253 ms 31420 KB Output is correct
20 Correct 265 ms 32064 KB Output is correct
21 Correct 271 ms 31436 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 3 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 2 ms 4948 KB Output is correct
14 Correct 2 ms 4948 KB Output is correct
15 Correct 275 ms 31032 KB Output is correct
16 Correct 283 ms 31692 KB Output is correct
17 Correct 353 ms 18636 KB Output is correct
18 Correct 1671 ms 17488 KB Output is correct
19 Correct 1559 ms 17080 KB Output is correct
20 Correct 1145 ms 17080 KB Output is correct
21 Correct 1326 ms 17168 KB Output is correct
22 Correct 1348 ms 17880 KB Output is correct
23 Correct 1763 ms 17524 KB Output is correct
24 Correct 1503 ms 17768 KB Output is correct
25 Correct 985 ms 18656 KB Output is correct
26 Correct 931 ms 18636 KB Output is correct
27 Correct 1000 ms 19952 KB Output is correct
28 Correct 843 ms 18532 KB Output is correct
29 Correct 799 ms 18172 KB Output is correct
30 Correct 900 ms 18748 KB Output is correct
31 Correct 941 ms 18124 KB Output is correct
32 Correct 210 ms 32264 KB Output is correct
33 Correct 201 ms 31472 KB Output is correct
34 Correct 212 ms 30132 KB Output is correct
35 Correct 248 ms 30016 KB Output is correct
36 Correct 208 ms 32108 KB Output is correct
37 Correct 224 ms 31852 KB Output is correct
38 Correct 232 ms 32808 KB Output is correct
39 Correct 212 ms 32440 KB Output is correct
40 Correct 194 ms 32124 KB Output is correct
41 Correct 235 ms 31568 KB Output is correct
42 Correct 243 ms 30564 KB Output is correct
43 Correct 237 ms 33116 KB Output is correct
44 Correct 225 ms 33356 KB Output is correct
45 Correct 261 ms 32592 KB Output is correct
46 Correct 246 ms 31624 KB Output is correct
47 Correct 254 ms 30448 KB Output is correct
48 Correct 248 ms 30372 KB Output is correct
49 Correct 307 ms 31772 KB Output is correct
50 Correct 253 ms 31420 KB Output is correct
51 Correct 265 ms 32064 KB Output is correct
52 Correct 271 ms 31436 KB Output is correct
53 Execution timed out 3083 ms 17400 KB Time limit exceeded
54 Halted 0 ms 0 KB -