Submission #1106340

#	Time	Username	Problem	Language	Result	Execution time	Memory
1106340		whoknow	Museum (CEOI17_museum)	C++17	0 / 100	56 ms	3912 KiB

museum

#include <bits/stdc++.h>
#define ll long long
#define F first
#define S second
#define MAXN 10005
#define ii pair<int,int>
#define bit(i,j) ((i>>j)&1)
#define sz(i) (int)i.size()
#define endl '\n'
using namespace std;
const int INF = 1e9;
int n, k, st;
vector<ii>g[MAXN];
namespace sub1
{
int res=INF;
int s[MAXN];
vector<ii> dp[MAXN];
vector<ii> combine(vector<ii>x, vector<ii>y)
{
    vector<ii>ans(sz(x) + sz(y) - 1, {INF,INF});
    ans[0]=x[0];
    ans[1]=x[1];
    for(int i = 1; i < sz(x); i++)
        for(int j = 0; j <= min(sz(y) - 1, n - i); j++)
            ans[i + j] =min(ans[i+j], {x[i].F + y[j].F,y[j].S});
    return ans;
}
void dfs(int u, int p, int w)
{
    s[u]=s[p]+w;
    dp[u] = {{0,0}, {w,s[u]}};
    for(ii i : g[u])
    {
        int v = i.F, w = i.S;
        if(v == p)
            continue;
        dfs(v, u, w);
        dp[u] = combine(dp[u], dp[v]);
    }
}
void solve()
{
    dfs(st, 0, 0);
    cout<<dp[st][k].F*2-dp[st][k].S;
}
}
main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n >> k >> st;
    for(int i = 1; i < n; i++)
    {
        int x, y, z;
        cin >> x >> y >> z;
        g[x].push_back({y, z});
        g[y].push_back({x, z});
    }
    sub1::solve();
}

Compilation message (stderr)

museum.cpp:48:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   48 | main()
      | ^~~~

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