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답안 #528552

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
528552 2022-02-20T14:07:53 Z couplefire Parkovi (COCI22_parkovi) C++17
110 / 110
 1014 ms 34980 KB 
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int, int>
#define f first
#define s second

const int N = 200005;

int n, k;
vector<pii> adj[N];
bool vis[N], park[N];

ll dfs(int v, int p, ll mid){
    if(v!=0 && (int)adj[v].size()==1)
        return 0;
    ll mn = 1e16, mx = -1e16;
    for(auto [u, w] : adj[v]){
        if(u==p) continue;
        ll val = dfs(u, v, mid);
        if(val==0ll && vis[u]){
            mn = min(mn, 0ll);
            mx = max(mx, 0ll);
            continue;
        }
        if(val+w<=0ll) vis[v] = 1, val += w;
        else if(val<0ll) val = 0;
        else val += w;
        if(val>mid){
            park[u] = 1;
            val = min(-mid+w, 0ll);
            if(-mid+w<=0ll) vis[v] = 1;
            vis[u] = 1;
        }
        mn = min(mn, val);
        mx = max(mx, val);
    }
    if(-mn>=mx) return mn;
    return mx;
}

int check(ll mid){
    memset(vis, 0, sizeof vis);
    memset(park, 0, sizeof park);
    if(dfs(0, 0, mid)>0) park[0] = 1;
    else if(!vis[0]) park[0] = 1;
    int cnt = 0;
    for(int i = 0; i<n; ++i)
        cnt += park[i];
    return cnt;
}

int main(){
    // freopen("a.in", "r", stdin);
    cin.tie(0)->sync_with_stdio(0);
    cin >> n >> k;
    for(int i = 0; i<n-1; ++i){
        int a, b, w;
        cin >> a >> b >> w;
        --a; --b;
        adj[a].push_back({b, w});
        adj[b].push_back({a, w});
    }
    ll lo = 0, hi = 1e16;
    while(lo<hi){
        ll mid = lo+(hi-lo)/2;
        if(check(mid)<=k) hi = mid;
        else lo = mid+1;
    }
    cout << lo << '\n';
    check(lo);
    vector<int> res;
    for(int i = 0; i<n; ++i)
        if(park[i]) res.push_back(i);
    for(int i = 0; i<n; ++i)
        if(!park[i] && (int)res.size()<k)
            res.push_back(i);
    for(auto x : res)
        cout << x+1 << ' ';
    cout << '\n';
}

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5324 KB Output is correct
2 Correct 4 ms 5308 KB Output is correct
3 Correct 3 ms 5316 KB Output is correct
4 Correct 3 ms 5324 KB Output is correct
5 Correct 3 ms 5324 KB Output is correct
6 Correct 3 ms 5396 KB Output is correct
7 Correct 3 ms 5324 KB Output is correct
8 Correct 3 ms 5400 KB Output is correct
9 Correct 3 ms 5324 KB Output is correct
10 Correct 3 ms 5324 KB Output is correct
11 Correct 3 ms 5324 KB Output is correct
12 Correct 3 ms 5400 KB Output is correct
13 Correct 4 ms 5400 KB Output is correct
14 Correct 4 ms 5308 KB Output is correct

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 353 ms 31476 KB Output is correct
2 Correct 366 ms 31604 KB Output is correct
3 Correct 200 ms 17332 KB Output is correct
4 Correct 829 ms 16324 KB Output is correct
5 Correct 794 ms 15960 KB Output is correct
6 Correct 811 ms 15980 KB Output is correct
7 Correct 748 ms 14792 KB Output is correct
8 Correct 853 ms 13912 KB Output is correct
9 Correct 823 ms 12396 KB Output is correct
10 Correct 868 ms 15932 KB Output is correct
11 Correct 656 ms 17112 KB Output is correct
12 Correct 642 ms 17580 KB Output is correct
13 Correct 706 ms 18872 KB Output is correct
14 Correct 670 ms 16484 KB Output is correct
15 Correct 611 ms 15940 KB Output is correct
16 Correct 639 ms 17348 KB Output is correct
17 Correct 674 ms 16628 KB Output is correct

Subtask #3
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 378 ms 33564 KB Output is correct
2 Correct 420 ms 33260 KB Output is correct
3 Correct 340 ms 31708 KB Output is correct
4 Correct 370 ms 31620 KB Output is correct
5 Correct 389 ms 34832 KB Output is correct
6 Correct 440 ms 34096 KB Output is correct
7 Correct 432 ms 34980 KB Output is correct
8 Correct 416 ms 33476 KB Output is correct
9 Correct 474 ms 33316 KB Output is correct
10 Correct 363 ms 30720 KB Output is correct
11 Correct 372 ms 28496 KB Output is correct
12 Correct 455 ms 31704 KB Output is correct
13 Correct 426 ms 31616 KB Output is correct
14 Correct 450 ms 30800 KB Output is correct
15 Correct 388 ms 29324 KB Output is correct
16 Correct 395 ms 28336 KB Output is correct
17 Correct 327 ms 28284 KB Output is correct
18 Correct 419 ms 29636 KB Output is correct
19 Correct 368 ms 30068 KB Output is correct
20 Correct 369 ms 30516 KB Output is correct
21 Correct 383 ms 29800 KB Output is correct

Subtask #4
60.0 / 60.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5324 KB Output is correct
2 Correct 4 ms 5308 KB Output is correct
3 Correct 3 ms 5316 KB Output is correct
4 Correct 3 ms 5324 KB Output is correct
5 Correct 3 ms 5324 KB Output is correct
6 Correct 3 ms 5396 KB Output is correct
7 Correct 3 ms 5324 KB Output is correct
8 Correct 3 ms 5400 KB Output is correct
9 Correct 3 ms 5324 KB Output is correct
10 Correct 3 ms 5324 KB Output is correct
11 Correct 3 ms 5324 KB Output is correct
12 Correct 3 ms 5400 KB Output is correct
13 Correct 4 ms 5400 KB Output is correct
14 Correct 4 ms 5308 KB Output is correct
15 Correct 353 ms 31476 KB Output is correct
16 Correct 366 ms 31604 KB Output is correct
17 Correct 200 ms 17332 KB Output is correct
18 Correct 829 ms 16324 KB Output is correct
19 Correct 794 ms 15960 KB Output is correct
20 Correct 811 ms 15980 KB Output is correct
21 Correct 748 ms 14792 KB Output is correct
22 Correct 853 ms 13912 KB Output is correct
23 Correct 823 ms 12396 KB Output is correct
24 Correct 868 ms 15932 KB Output is correct
25 Correct 656 ms 17112 KB Output is correct
26 Correct 642 ms 17580 KB Output is correct
27 Correct 706 ms 18872 KB Output is correct
28 Correct 670 ms 16484 KB Output is correct
29 Correct 611 ms 15940 KB Output is correct
30 Correct 639 ms 17348 KB Output is correct
31 Correct 674 ms 16628 KB Output is correct
32 Correct 378 ms 33564 KB Output is correct
33 Correct 420 ms 33260 KB Output is correct
34 Correct 340 ms 31708 KB Output is correct
35 Correct 370 ms 31620 KB Output is correct
36 Correct 389 ms 34832 KB Output is correct
37 Correct 440 ms 34096 KB Output is correct
38 Correct 432 ms 34980 KB Output is correct
39 Correct 416 ms 33476 KB Output is correct
40 Correct 474 ms 33316 KB Output is correct
41 Correct 363 ms 30720 KB Output is correct
42 Correct 372 ms 28496 KB Output is correct
43 Correct 455 ms 31704 KB Output is correct
44 Correct 426 ms 31616 KB Output is correct
45 Correct 450 ms 30800 KB Output is correct
46 Correct 388 ms 29324 KB Output is correct
47 Correct 395 ms 28336 KB Output is correct
48 Correct 327 ms 28284 KB Output is correct
49 Correct 419 ms 29636 KB Output is correct
50 Correct 368 ms 30068 KB Output is correct
51 Correct 369 ms 30516 KB Output is correct
52 Correct 383 ms 29800 KB Output is correct
53 Correct 858 ms 12408 KB Output is correct
54 Correct 848 ms 12468 KB Output is correct
55 Correct 936 ms 12800 KB Output is correct
56 Correct 860 ms 12768 KB Output is correct
57 Correct 948 ms 13592 KB Output is correct
58 Correct 798 ms 12388 KB Output is correct
59 Correct 971 ms 14748 KB Output is correct
60 Correct 1014 ms 12820 KB Output is correct
61 Correct 788 ms 12160 KB Output is correct
62 Correct 829 ms 13168 KB Output is correct
63 Correct 945 ms 12852 KB Output is correct
64 Correct 801 ms 14416 KB Output is correct
65 Correct 895 ms 12744 KB Output is correct
66 Correct 931 ms 13348 KB Output is correct
67 Correct 741 ms 12200 KB Output is correct
68 Correct 939 ms 14888 KB Output is correct
69 Correct 379 ms 29440 KB Output is correct
70 Correct 376 ms 28200 KB Output is correct
71 Correct 436 ms 31128 KB Output is correct
72 Correct 176 ms 12628 KB Output is correct
73 Correct 222 ms 13004 KB Output is correct
74 Correct 194 ms 14564 KB Output is correct
75 Correct 598 ms 14292 KB Output is correct
76 Correct 638 ms 14616 KB Output is correct
77 Correct 633 ms 14276 KB Output is correct
78 Correct 675 ms 14716 KB Output is correct