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Submission #343016

# Submission time Handle Problem Language Result Execution time Memory
343016 2021-01-03T11:04:41 Z mjhmjh1104 Village (BOI20_village) C++14
50 / 100
 128 ms 24348 KB 
#include <cstdio>
#include <vector>
#include <algorithm>
using namespace std;

const int MAX = 100006;

int n, maxDepth[MAX], depth[MAX], childs[MAX];
vector<int> adj[MAX], c[MAX];
int nextShort[MAX], e[MAX], resShort;
int nextLong[MAX];
long long resLong;
bool visited[MAX];

void dfs(int x, int prev = -1) {
    for (auto &i: adj[x]) if (i != prev) {
        c[x].push_back(i);
        dfs(i, x);
    }
}

void dfsShort(int x) {
    e[x] = x;
    vector<int> zero;
    for (auto &i: c[x]) {
        if (!childs[i]) zero.push_back(i), e[x] = i;
        else {
            dfsShort(i);
            if (childs[i]) childs[x]--;
            else zero.push_back(i), e[x] = i;
        }
    }
    if (!childs[x]) return;
    if (zero.empty()) return;
    nextShort[x] = zero[0];
    for (int i = 0; i < (int)zero.size(); i++) {
        if (i != (int)zero.size() - 1) nextShort[zero[i]] = zero[i + 1];
        else nextShort[zero[i]] = x;
        resShort += 2;
    }
}

void depthFrom(int x, int prev = -1) {
    maxDepth[x] = depth[x];
    for (auto &i: adj[x]) if (i != prev && !visited[i]) {
        depth[i] = depth[x] + 1;
        depthFrom(i, x);
        maxDepth[x] = max(maxDepth[x], maxDepth[i]);
    }
}

pair<int, int> farthest(int x, int prev = -1) {
    for (auto &i: adj[x]) if (i != prev && !visited[i]) {
        if (maxDepth[i] == maxDepth[x]) {
            pair<int, int> t = farthest(i, x);
            return { t.first, t.second + 1 };
        }
    }
    return { x, 0 };
}

pair<pair<int, int>, int> d() {
    depth[0] = 0;
    depthFrom(0);
    int t = farthest(0).first;
    depth[t] = 0;
    depthFrom(t);
    pair<int, int> u = farthest(t);
    return { make_pair(u.first, t), u.second };
}

int main() {
    scanf("%d", &n);
    fill(nextShort, nextShort + n, -1);
    for (int i = 0; i < n - 1; i++) {
        int u, v;
        scanf("%d%d", &u, &v);
        u--, v--;
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    dfs(0);
    for (int i = 0; i < n; i++) childs[i] = (int)c[i].size();
    dfsShort(0);
    if (nextShort[0] == -1) {
        nextShort[0] = c[0][0];
        nextShort[e[c[0][0]]] = 0;
        resShort += 2;
    }
    if (n > 1000) {
        printf("%d 0\n", resShort);
        for (int i = 0; i < n; i++) printf("%d ", nextShort[i] + 1);
        puts("");
        for (int i = 0; i < n - 1; i++) printf("%d ", i + 2);
        printf("1");
        return 0;
    }
    for (int i = 0; i < n / 2 - n % 2; i++) {
        auto it = d();
        resLong += 2 * it.second;
        visited[it.first.first] = visited[it.first.second] = true;
        nextLong[it.first.first] = it.first.second;
        nextLong[it.first.second] = it.first.first;
    }
    if (n % 2) {
        vector<int> v;
        for (int i = 0; i < n; i++) if (!visited[i]) v.push_back(i);
        nextLong[v[0]] = v[1];
        nextLong[v[1]] = v[2];
        nextLong[v[2]] = v[0];
        resLong += 4;
    }
    printf("%d %lld\n", resShort, resLong);
    for (int i = 0; i < n; i++) printf("%d ", nextShort[i] + 1);
    puts("");
    for (int i = 0; i < n; i++) printf("%d ", nextLong[i] + 1);
}

Compilation message

Village.cpp: In function 'int main()':
Village.cpp:73:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   73 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
Village.cpp:77:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   77 |         scanf("%d%d", &u, &v);
      |         ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
6.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4972 KB Output is correct
2 Correct 3 ms 4972 KB Output is correct
3 Correct 3 ms 4972 KB Output is correct
4 Correct 3 ms 4972 KB Output is correct
5 Correct 3 ms 4972 KB Output is correct
6 Correct 3 ms 4972 KB Output is correct
7 Correct 3 ms 4972 KB Output is correct
8 Correct 4 ms 4972 KB Output is correct
9 Correct 3 ms 4972 KB Output is correct
10 Correct 3 ms 4972 KB Output is correct
11 Partially correct 3 ms 4972 KB Partially correct
12 Partially correct 3 ms 4972 KB Partially correct
13 Correct 3 ms 4972 KB Output is correct
14 Correct 4 ms 4972 KB Output is correct
15 Correct 3 ms 4972 KB Output is correct
16 Correct 4 ms 4972 KB Output is correct
17 Correct 3 ms 4972 KB Output is correct

Subtask #2
19.0 / 38.0

# Verdict Execution time Memory Grader output
1 Partially correct 5 ms 5100 KB Partially correct
2 Partially correct 5 ms 5100 KB Partially correct
3 Partially correct 5 ms 5100 KB Partially correct
4 Partially correct 10 ms 5100 KB Partially correct
5 Partially correct 14 ms 5100 KB Partially correct
6 Partially correct 15 ms 5100 KB Partially correct
7 Partially correct 22 ms 5228 KB Partially correct
8 Partially correct 18 ms 5100 KB Partially correct
9 Partially correct 12 ms 5100 KB Partially correct
10 Partially correct 17 ms 5100 KB Partially correct
11 Partially correct 8 ms 5100 KB Partially correct
12 Correct 11 ms 5100 KB Output is correct
13 Correct 11 ms 5100 KB Output is correct
14 Partially correct 11 ms 5100 KB Partially correct
15 Partially correct 6 ms 5100 KB Partially correct
16 Correct 13 ms 5100 KB Output is correct
17 Partially correct 12 ms 5100 KB Partially correct
18 Partially correct 10 ms 5100 KB Partially correct
19 Partially correct 11 ms 5100 KB Partially correct
20 Correct 11 ms 5100 KB Output is correct
21 Partially correct 10 ms 5100 KB Partially correct
22 Partially correct 11 ms 5100 KB Partially correct
23 Partially correct 12 ms 5100 KB Partially correct
24 Partially correct 12 ms 5100 KB Partially correct
25 Partially correct 6 ms 5100 KB Partially correct
26 Partially correct 14 ms 5228 KB Partially correct
27 Partially correct 6 ms 5228 KB Partially correct
28 Partially correct 14 ms 5228 KB Partially correct
29 Partially correct 12 ms 5100 KB Partially correct
30 Correct 10 ms 5100 KB Output is correct

Subtask #3
25.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4972 KB Output is correct
2 Correct 3 ms 4972 KB Output is correct
3 Correct 3 ms 4972 KB Output is correct
4 Correct 3 ms 4972 KB Output is correct
5 Correct 3 ms 4972 KB Output is correct
6 Correct 3 ms 4972 KB Output is correct
7 Correct 3 ms 4972 KB Output is correct
8 Correct 4 ms 4972 KB Output is correct
9 Correct 3 ms 4972 KB Output is correct
10 Correct 3 ms 4972 KB Output is correct
11 Partially correct 3 ms 4972 KB Partially correct
12 Partially correct 3 ms 4972 KB Partially correct
13 Correct 3 ms 4972 KB Output is correct
14 Correct 4 ms 4972 KB Output is correct
15 Correct 3 ms 4972 KB Output is correct
16 Correct 4 ms 4972 KB Output is correct
17 Correct 3 ms 4972 KB Output is correct
18 Partially correct 5 ms 5100 KB Partially correct
19 Partially correct 5 ms 5100 KB Partially correct
20 Partially correct 5 ms 5100 KB Partially correct
21 Partially correct 10 ms 5100 KB Partially correct
22 Partially correct 14 ms 5100 KB Partially correct
23 Partially correct 15 ms 5100 KB Partially correct
24 Partially correct 22 ms 5228 KB Partially correct
25 Partially correct 18 ms 5100 KB Partially correct
26 Partially correct 12 ms 5100 KB Partially correct
27 Partially correct 17 ms 5100 KB Partially correct
28 Partially correct 8 ms 5100 KB Partially correct
29 Correct 11 ms 5100 KB Output is correct
30 Correct 11 ms 5100 KB Output is correct
31 Partially correct 11 ms 5100 KB Partially correct
32 Partially correct 6 ms 5100 KB Partially correct
33 Correct 13 ms 5100 KB Output is correct
34 Partially correct 12 ms 5100 KB Partially correct
35 Partially correct 10 ms 5100 KB Partially correct
36 Partially correct 11 ms 5100 KB Partially correct
37 Correct 11 ms 5100 KB Output is correct
38 Partially correct 10 ms 5100 KB Partially correct
39 Partially correct 11 ms 5100 KB Partially correct
40 Partially correct 12 ms 5100 KB Partially correct
41 Partially correct 12 ms 5100 KB Partially correct
42 Partially correct 6 ms 5100 KB Partially correct
43 Partially correct 14 ms 5228 KB Partially correct
44 Partially correct 6 ms 5228 KB Partially correct
45 Partially correct 14 ms 5228 KB Partially correct
46 Partially correct 12 ms 5100 KB Partially correct
47 Correct 10 ms 5100 KB Output is correct
48 Partially correct 90 ms 11628 KB Partially correct
49 Partially correct 99 ms 12140 KB Partially correct
50 Partially correct 97 ms 12160 KB Partially correct
51 Partially correct 91 ms 10604 KB Partially correct
52 Partially correct 101 ms 12140 KB Partially correct
53 Partially correct 92 ms 11444 KB Partially correct
54 Partially correct 48 ms 14188 KB Partially correct
55 Partially correct 128 ms 24348 KB Partially correct
56 Partially correct 109 ms 18028 KB Partially correct
57 Partially correct 122 ms 16108 KB Partially correct
58 Partially correct 104 ms 14444 KB Partially correct
59 Partially correct 96 ms 12140 KB Partially correct
60 Partially correct 62 ms 11108 KB Partially correct
61 Partially correct 71 ms 11340 KB Partially correct
62 Partially correct 74 ms 11372 KB Partially correct
63 Partially correct 70 ms 11116 KB Partially correct
64 Partially correct 80 ms 11756 KB Partially correct
65 Partially correct 69 ms 11628 KB Partially correct
66 Partially correct 64 ms 11116 KB Partially correct
67 Partially correct 50 ms 9720 KB Partially correct
68 Partially correct 79 ms 10604 KB Partially correct
69 Partially correct 70 ms 11756 KB Partially correct
70 Partially correct 63 ms 11244 KB Partially correct
71 Partially correct 51 ms 9708 KB Partially correct
72 Partially correct 58 ms 10220 KB Partially correct
73 Partially correct 68 ms 11756 KB Partially correct
74 Partially correct 63 ms 11116 KB Partially correct
75 Partially correct 107 ms 12140 KB Partially correct
76 Partially correct 98 ms 11500 KB Partially correct
77 Partially correct 79 ms 11628 KB Partially correct
78 Partially correct 60 ms 9452 KB Partially correct
79 Partially correct 81 ms 10092 KB Partially correct
80 Partially correct 95 ms 12140 KB Partially correct
81 Partially correct 76 ms 11756 KB Partially correct
82 Partially correct 69 ms 11372 KB Partially correct