Submission #533580

#	Time	Username	Problem	Language	Result	Execution time	Memory
533580		Slavita	Parkovi (COCI22_parkovi)	C++14	10 / 110	268 ms	20464 KiB

Main

#include <bits/stdc++.h>
/*#pragma optimize("O3")
#pragma GCC optimize("-O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("fast-math")*/
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
#define ve vector<int>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define pi pair<int,int>
#define all(v) v.begin(),v.end()
#define si(v) (int)v.size()
#define en '\n'
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define ordered_muiltiset tree<int, null_type,less_equal<>, rb_tree_tag,tree_order_statistics_node_update>
#define int long long
using namespace std;
//using namespace __gnu_pbds;
typedef long long ll;
typedef unsigned long long ull;

const int N = 2e5 + 228;
const int big = 1e9 + 228;
const ll llbig = 1e18 + 228;
//ordered_set os; // os.order_of_key(4), (*os.find_by_order(5))
int n, m, ans, k, q, d[N], longest, allsm, pr[N];
ve ansv;
vector<pair<int, int>> g[N];

void dfs(int v, int dist, int pr){
    if (dist <= d[v]){
        d[v] = dist;
    }else return;

    for (int i = 0; i < si(g[v]); i++){
        int u = g[v][i].fi;
        int cost = g[v][i].se;
        if (u == pr) continue;

        dfs(u, dist + cost, v);
    }
}

void dfs2(int v, int dist, int pr){
    longest = max(longest, dist);
    for (int i = 0; i < si(g[v]); i++){
        int u = g[v][i].fi;
        int cost = g[v][i].se;
        if (u == pr) continue;

        dfs(u, dist + cost, v);
    }
}

bool getbit(int mask, int bit){
    bit--;
    return (mask & (1 << bit)) == (1 << bit);
}

#undef int
int main(){
    #define int long long
    iostream::sync_with_stdio(false); cin.tie(0); ios_base::sync_with_stdio(false); cout.tie(0);
    //freopen("input.txt","r",stdin);
    //freopen("output.txt","w",stdout);
    cin >> n >> k;
    vector<pair<int, pair<int, int>>> reb;
    for (int i = 1; i <= n - 1; i++){
        int a, b, d;
        cin >> a >> b >> d;
        g[a].pb({b, d});
        g[b].pb({a, d});
        if (a > b) swap(a, b);
        reb.pb({a, {b, d}});
        allsm += d;
    }

    ans = llbig;
    if (n > 20){
        sort(all(reb));
        for (int i = 1; i <= n; i++){
            pr[i] = pr[i - 1] + reb[i - 1].se.se;
        }
        int ans = llbig, ani;
        for (int i = 1; i <= n - 1; i++){
            int what = max(pr[n - 1] - pr[i - 1], pr[i - 1]);
            if (ans > what){
                ans = what;
                ani = i;
            }
        }
        cout << ans << en << ani;
        return 0;
    }else{
        for (int mask = 1; mask <= (1 << n); mask++){
            ve v;
            for (int i = 1; i <= n; i++){
                if (getbit(mask, i)){
                    v.pb(i);
                }
            }
            if (si(v) != k) continue;

            for (int i = 1; i <= n; i++) d[i] = llbig;
            for (int i = 0; i < si(v); i++){
                dfs(v[i], 0, -1);
            }

            int mx = -llbig;
            for (int i = 1; i <= n; i++){
                mx = max(mx, d[i]);
            }

            if (mx < ans){
                ans = mx;
                ansv = v;
            }
        }
    }

    cout << ans << en;
    for (int i = 0; i < si(ansv); i++){
        cout << ansv[i] << ' ';
    }
    return 0;
}

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