oj.uz

답안 #533553

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
533553 2022-03-06T09:22:55 Z Slavita Parkovi (COCI22_parkovi) C++14
0 / 110
 3000 ms 26968 KB 
#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;
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;
    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});
    }

    ve ansv;
    int ans = llbig;
    if (k == 1){
        for (int i = 1; i <= n; i++) d[i] = llbig;
        for (int i = 1; i <= n; i++){
            longest = 0;
            dfs2(i, 0, -1);
            if (longest < ans){
                ans = longest;
                ansv.resize(0);
                ansv.pb(i);
            }
        }
    }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
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 239 ms 4996 KB Output is correct
2 Correct 222 ms 4996 KB Output is correct
3 Correct 267 ms 4940 KB Output is correct
4 Incorrect 3 ms 4940 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 3091 ms 26968 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #3
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 3029 ms 15924 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0 / 60.0

# 결과 실행 시간 메모리 Grader output
1 Correct 239 ms 4996 KB Output is correct
2 Correct 222 ms 4996 KB Output is correct
3 Correct 267 ms 4940 KB Output is correct
4 Incorrect 3 ms 4940 KB Output isn't correct
5 Halted 0 ms 0 KB -