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답안 #483566

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
483566 2021-10-30T19:42:40 Z SorahISA Village (BOI20_village) C++17
100 / 100
 101 ms 18836 KB 
#pragma GCC optimize("Ofast", "unroll-loops")

#include <bits/stdc++.h>
using namespace std;

#define int long long
#define double long double
using pii = pair<int, int>;
template<typename T>
using prior = priority_queue<T, vector<T>, greater<T>>;
template<typename T>
using Prior = priority_queue<T>;

#define X first
#define Y second
#define ALL(x) (x).begin(), (x).end()
#define eb emplace_back
#define pb push_back
#define fastIO() ios_base::sync_with_stdio(false), cin.tie(0)

const int maxn = 1E5 + 5;

int n, cnt1 = 0, cnt2 = 0;
vector<int> ans1, ans2;
vector<int> adj[maxn], par(maxn), sz(maxn), pl(maxn);
deque<int> deq;

void dfs(int now, int lst) {
    par[now] = lst;
    for (auto x : adj[now]) {
        if (x != lst) dfs(x, now);
    }
    if (now != 1 and pl[now] == now) ++cnt1, swap(pl[now], pl[par[now]]);
}

void dfs_sz(int now, int lst) {
    sz[now] = 1, par[now] = lst;
    for (auto x : adj[now]) {
        if (x != lst) dfs_sz(x, now), sz[now] += sz[x];
    }
}

void dfs_get(int now, int lst) {
    deq.push_back(now);
    for (auto x : adj[now]) {
        if (x != lst) dfs_get(x, now);
    }
}

void dfs_put(int now, int lst) {
    pl[now] = deq.front(), deq.pop_front();
    for (auto x : adj[now]) {
        if (x != lst) dfs_put(x, now);
    }
}

void solve1() {
    iota(ALL(pl), 0);
    
    dfs(1, -1);
    
    if (pl[1] == 1) ++cnt1, swap(pl[1], pl[adj[1][0]]);
    
    cnt1 *= 2, ans1 = vector<int>(pl.begin()+1, pl.begin()+n+1);
}

void solve2() {
    iota(ALL(pl), 0);
    
    dfs_sz(1, -1);
    
    int rt = 0;
    for (int i = 1; i <= n; ++i) {
        int maxCh = 0;
        for (auto x : adj[i]) {
            if (x != par[i]) maxCh = max(maxCh, sz[x]);
            else             maxCh = max(maxCh, n - sz[i]);
        }
        if (maxCh <= n/2) {rt = i; break;}
    }
    
    dfs_sz(rt, -1);
    sort(ALL(adj[rt]), [](auto a, auto b) {return sz[a] > sz[b];});
    
    int rt_ch = adj[rt].size();
    for (int i = 0; i < rt_ch; ++i) dfs_get(adj[rt][i], rt);
    for (int i = 1; i < rt_ch; ++i) dfs_put(adj[rt][i], rt);
    pl[rt] = deq.front(), deq.pop_front();
    deq.push_back(rt), dfs_put(adj[rt][0], rt);
    
    for (int i = 1; i <= n; ++i) cnt2 += min(sz[i], n - sz[i]);
    
    cnt2 *= 2, ans2 = vector<int>(pl.begin()+1, pl.begin()+n+1);
}

int32_t main() {
    fastIO();
    
    cin >> n;
    
    for (int i = 0; i < n-1; ++i) {
        int u, v; cin >> u >> v;
        adj[u].eb(v), adj[v].eb(u);
    }
    
    solve1(), solve2();
    
    cout << cnt1 << " " << cnt2 << "\n";
    for (auto x : ans1) cout << x << " "; cout << "\n";
    for (auto x : ans2) cout << x << " "; cout << "\n";
    
    return 0;
}

Compilation message

Village.cpp: In function 'int32_t main()':
Village.cpp:109:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  109 |     for (auto x : ans1) cout << x << " "; cout << "\n";
      |     ^~~
Village.cpp:109:43: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  109 |     for (auto x : ans1) cout << x << " "; cout << "\n";
      |                                           ^~~~
Village.cpp:110:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  110 |     for (auto x : ans2) cout << x << " "; cout << "\n";
      |     ^~~
Village.cpp:110:43: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  110 |     for (auto x : ans2) cout << x << " "; cout << "\n";
      |                                           ^~~~

Subtask #1
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 4940 KB Output is correct
2 Correct 3 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 2 ms 4940 KB Output is correct
5 Correct 2 ms 4940 KB Output is correct
6 Correct 2 ms 4940 KB Output is correct
7 Correct 2 ms 5032 KB Output is correct
8 Correct 2 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 3 ms 4940 KB Output is correct
11 Correct 2 ms 4940 KB Output is correct
12 Correct 2 ms 4940 KB Output is correct
13 Correct 2 ms 4940 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 2 ms 4940 KB Output is correct
16 Correct 2 ms 4940 KB Output is correct
17 Correct 2 ms 4940 KB Output is correct

Subtask #2
38.0 / 38.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5024 KB Output is correct
2 Correct 3 ms 5068 KB Output is correct
3 Correct 3 ms 5032 KB Output is correct
4 Correct 3 ms 5068 KB Output is correct
5 Correct 4 ms 5068 KB Output is correct
6 Correct 3 ms 5068 KB Output is correct
7 Correct 3 ms 5068 KB Output is correct
8 Correct 3 ms 5068 KB Output is correct
9 Correct 3 ms 5068 KB Output is correct
10 Correct 3 ms 5040 KB Output is correct
11 Correct 3 ms 5068 KB Output is correct
12 Correct 3 ms 5068 KB Output is correct
13 Correct 3 ms 5068 KB Output is correct
14 Correct 3 ms 5068 KB Output is correct
15 Correct 3 ms 5068 KB Output is correct
16 Correct 3 ms 5068 KB Output is correct
17 Correct 3 ms 5036 KB Output is correct
18 Correct 3 ms 5040 KB Output is correct
19 Correct 3 ms 5068 KB Output is correct
20 Correct 3 ms 5068 KB Output is correct
21 Correct 3 ms 5068 KB Output is correct
22 Correct 3 ms 5068 KB Output is correct
23 Correct 3 ms 5068 KB Output is correct
24 Correct 3 ms 5068 KB Output is correct
25 Correct 3 ms 5068 KB Output is correct
26 Correct 3 ms 5068 KB Output is correct
27 Correct 3 ms 5068 KB Output is correct
28 Correct 3 ms 5068 KB Output is correct
29 Correct 3 ms 5068 KB Output is correct
30 Correct 3 ms 5068 KB Output is correct

Subtask #3
50.0 / 50.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 4940 KB Output is correct
2 Correct 3 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 2 ms 4940 KB Output is correct
5 Correct 2 ms 4940 KB Output is correct
6 Correct 2 ms 4940 KB Output is correct
7 Correct 2 ms 5032 KB Output is correct
8 Correct 2 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 3 ms 4940 KB Output is correct
11 Correct 2 ms 4940 KB Output is correct
12 Correct 2 ms 4940 KB Output is correct
13 Correct 2 ms 4940 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 2 ms 4940 KB Output is correct
16 Correct 2 ms 4940 KB Output is correct
17 Correct 2 ms 4940 KB Output is correct
18 Correct 3 ms 5024 KB Output is correct
19 Correct 3 ms 5068 KB Output is correct
20 Correct 3 ms 5032 KB Output is correct
21 Correct 3 ms 5068 KB Output is correct
22 Correct 4 ms 5068 KB Output is correct
23 Correct 3 ms 5068 KB Output is correct
24 Correct 3 ms 5068 KB Output is correct
25 Correct 3 ms 5068 KB Output is correct
26 Correct 3 ms 5068 KB Output is correct
27 Correct 3 ms 5040 KB Output is correct
28 Correct 3 ms 5068 KB Output is correct
29 Correct 3 ms 5068 KB Output is correct
30 Correct 3 ms 5068 KB Output is correct
31 Correct 3 ms 5068 KB Output is correct
32 Correct 3 ms 5068 KB Output is correct
33 Correct 3 ms 5068 KB Output is correct
34 Correct 3 ms 5036 KB Output is correct
35 Correct 3 ms 5040 KB Output is correct
36 Correct 3 ms 5068 KB Output is correct
37 Correct 3 ms 5068 KB Output is correct
38 Correct 3 ms 5068 KB Output is correct
39 Correct 3 ms 5068 KB Output is correct
40 Correct 3 ms 5068 KB Output is correct
41 Correct 3 ms 5068 KB Output is correct
42 Correct 3 ms 5068 KB Output is correct
43 Correct 3 ms 5068 KB Output is correct
44 Correct 3 ms 5068 KB Output is correct
45 Correct 3 ms 5068 KB Output is correct
46 Correct 3 ms 5068 KB Output is correct
47 Correct 3 ms 5068 KB Output is correct
48 Correct 65 ms 12672 KB Output is correct
49 Correct 74 ms 13504 KB Output is correct
50 Correct 74 ms 13536 KB Output is correct
51 Correct 54 ms 11588 KB Output is correct
52 Correct 74 ms 13316 KB Output is correct
53 Correct 62 ms 12536 KB Output is correct
54 Correct 37 ms 11716 KB Output is correct
55 Correct 101 ms 18836 KB Output is correct
56 Correct 100 ms 16160 KB Output is correct
57 Correct 88 ms 15116 KB Output is correct
58 Correct 94 ms 14300 KB Output is correct
59 Correct 81 ms 13552 KB Output is correct
60 Correct 54 ms 13580 KB Output is correct
61 Correct 58 ms 13620 KB Output is correct
62 Correct 59 ms 13712 KB Output is correct
63 Correct 56 ms 13252 KB Output is correct
64 Correct 63 ms 13884 KB Output is correct
65 Correct 59 ms 14008 KB Output is correct
66 Correct 56 ms 13236 KB Output is correct
67 Correct 40 ms 11328 KB Output is correct
68 Correct 49 ms 12516 KB Output is correct
69 Correct 60 ms 13960 KB Output is correct
70 Correct 61 ms 13400 KB Output is correct
71 Correct 39 ms 11204 KB Output is correct
72 Correct 43 ms 12084 KB Output is correct
73 Correct 62 ms 14020 KB Output is correct
74 Correct 51 ms 13124 KB Output is correct
75 Correct 79 ms 13888 KB Output is correct
76 Correct 79 ms 13380 KB Output is correct
77 Correct 66 ms 13740 KB Output is correct
78 Correct 39 ms 10820 KB Output is correct
79 Correct 49 ms 11712 KB Output is correct
80 Correct 77 ms 13932 KB Output is correct
81 Correct 61 ms 13868 KB Output is correct
82 Correct 63 ms 13636 KB Output is correct