Submission #1056222

#	Time	Username	Problem	Language	Result	Execution time	Memory
1056222		manhlinh1501	Parkovi (COCI22_parkovi)	C++17	10 / 110	36 ms	15444 KiB

Main

#include <bits/stdc++.h>
using namespace std;
using pii = pair<int, int>;
using i64 = long long;
using pli = pair<i64, int>;
const int MAXN = 2e5 + 5;
const i64 oo64 = 1e18;
#define ALL(a) (a).begin(), (a).end()
int N, K;
vector<pii> adj[MAXN];

namespace subtask {
    const int MAXN = 25;

    bool is_subtask() {
        return N <= 20;
    }

    i64 dist[MAXN][MAXN];

    void DFS(int r, int u, int p) {
        for(auto [v, w] : adj[u]) {
            if(v == p) continue;
            dist[r][v] = dist[r][u] + w;
            DFS(r, v, u);
        }
    }

    void solution() {
        if(is_subtask() == false) return;
        for(int i = 1; i <= N; i++) {
            dist[i][i] = 0;
            DFS(i, i, 0);
        }

        i64 ans = oo64;
        int best = 0;
        for(int mask = 0; mask < (1 << N); mask++) {
            if(__builtin_popcount(mask) != K) continue;
            vector<int> b(N + 1, 0);
            for(int i = 0; i < N; i++) b[i + 1] = (mask >> i & 1);
            i64 res = 0;

            for(int i = 1; i <= N; i++) {
                i64 minn = oo64;
                for(int j = 1; j <= N; j++) {
                    if(b[j])
                        minn = min(minn, dist[i][j]);
                }
                res = max(res, minn);
            }
            if(ans > res) {
                ans = res;
                best = mask;
            }
        }
        cout << ans;
        cout << "\n";
        for(int i = 0; i < N; i++) {
            if(best >> i & 1) cout << i + 1 << " ";
        }
        exit(0);
    }
}

signed main() {
#define TASK "code"

    if (fopen(TASK ".inp", "r")) {
        freopen(TASK ".inp", "r", stdin);
        freopen(TASK ".out", "w", stdout);
    }

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin >> N >> K;
    for(int i = 1; i < N; i++) {
        int u, v, w;
        cin >> u >> v >> w;
        adj[u].emplace_back(v, w);
        adj[v].emplace_back(u, w);
    }
    subtask::solution();
    return (0 ^ 0);
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:70:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |         freopen(TASK ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:71:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |         freopen(TASK ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 30
• Subtask 4: 0 / 60