Submission #1095004

#	Time	Username	Problem	Language	Result	Execution time	Memory
1095004		blackslex	Museum (CEOI17_museum)	C++17	100 / 100	736 ms	784468 KiB

museum

#include<bits/stdc++.h>

using namespace std;
using pii = pair<int, int>;

const int N = 1e4 + 5;
int n, k, c, x, y, z, sz[N], dp[N][2][N];
vector<pii> v[N];

void dfs (int cur, int par) {
    sz[cur] = 1;
    for (auto &[x, y]: v[cur]) {
        if (par == x) continue;
        dfs(x, cur);
        for (int i = sz[cur]; ~i; i--) {
            for (int j = sz[x]; ~j; j--) {
                dp[cur][0][i + j] = min(dp[cur][0][i + j], dp[cur][1][i] + dp[x][0][j] + y);
                dp[cur][0][i + j] = min(dp[cur][0][i + j], dp[cur][0][i] + dp[x][1][j] + y * 2);
                dp[cur][1][i + j] = min(dp[cur][1][i + j], dp[cur][1][i] + dp[x][1][j] + y * 2);
            }
        }
        sz[cur] += sz[x];
    }
}

int main() {
    scanf("%d %d %d", &n, &k, &c);
    for (int i = 1; i < n; i++) {
        scanf("%d %d %d", &x, &y, &z);
        v[x].emplace_back(y, z); v[y].emplace_back(x, z);
    }
    for (int i = 1; i <= n; i++) {
        for (auto j: {0, 1}) {
            for (int k = 2; k <= n; k++) dp[i][j][k] = 1e9;
        }
    }
    dfs(c, 0);
    printf("%d", min(dp[c][0][k], dp[c][1][k]));
}

Compilation message (stderr)

museum.cpp: In function 'int main()':
museum.cpp:27:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |     scanf("%d %d %d", &n, &k, &c);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
museum.cpp:29:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |         scanf("%d %d %d", &x, &y, &z);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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