Submission #1276725

#	Time	Username	Problem	Language	Result	Execution time	Memory
1276725		TIN	Museum (CEOI17_museum)	C++17	80 / 100	3123 ms	784396 KiB

museum

#include <bits/stdc++.h>

#define FNAME "RUNNING"

using namespace std;

const int N = 1e4 + 1;

int n, k, s;
vector<pair<int,int>> adj[N];
int sz[N];
int dp[N][N][2];

void Task() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    if (fopen(FNAME".INP","r")) {
        freopen(FNAME".INP","r",stdin);
        freopen(FNAME".OUT","w",stdout);
    }
}

void Input() {
    memset(dp, 0x3f, sizeof(dp));
    cin >> n >> k >> s;
    for (int i = 1; i < n; i++) {
        int u, v, w;
        cin >> u >> v >> w;
        adj[u].push_back({v, w});
        adj[v].push_back({u, w});
    }
}

int limu, limv;

void DFS(int u, int par) {
    dp[u][0][0] = 0;
    dp[u][1][0] = dp[u][1][1] = 0;
    sz[u] = 1;
    for (auto e : adj[u]) {
        int v, w;
        tie(v, w) = e;
        if (v ^ par) {
            DFS(v, u);
            sz[u] += sz[v];
            limu = min(sz[u], k);
            for (int x = limu; x >= 2; x--) {
                limv = min(sz[v], x);
                for (int y = 1; y <= limv; y++) {
                    dp[u][x][0] = min(dp[u][x][0], dp[u][x - y][0] + dp[v][y][0] + w * 2);
                    dp[u][x][1] = min(dp[u][x][1], dp[u][x - y][0] + w + dp[v][y][1]);
                    dp[u][x][1] = min(dp[u][x][1], dp[u][x - y][1] + dp[v][y][0] + w * 2);
                }
            }
        }
    }
}

void solve() {
    DFS(s, s);
    cout << min(dp[s][k][0], dp[s][k][1]) << '\n';
}

void Solve() {
    Input();
    solve();
}

int main() {
    Task();
    Solve();
    return 2231^2231;
}

Compilation message (stderr)

museum.cpp: In function 'void Task()':
museum.cpp:18:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |         freopen(FNAME".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
museum.cpp:19:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   19 |         freopen(FNAME".OUT","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 25 / 25
• Subtask 3: 35 / 35
• Subtask 4: 0 / 20