oj.uz

Submission #723535

# Submission time Handle Problem Language Result Execution time Memory
723535 2023-04-14T04:30:50 Z t6twotwo Village (BOI20_village) C++17
31 / 100
 700 ms 11192 KB 
#include <bits/stdc++.h>
using namespace std;
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n;
    cin >> n;
    vector<vector<int>> adj(n);
    for (int i = 1; i < n; i++) {
        int x; cin >> x; x--;
        int y; cin >> y; y--;
        adj[x].push_back(y);
        adj[y].push_back(x);
    }
    vector<int> amin(n);
    iota(amin.begin(), amin.end(), 0);
    int ansmin = 0;
    auto dfs = [&](auto dfs, int x, int p) -> bool {
        vector<int> b;
        for (int y : adj[x]) {
            if (y != p) {
                if (dfs(dfs, y, x)) {
                    b.push_back(y);
                }
            }
        }
        if (b.empty()) {
            return 1;
        }
        ansmin += b.size() * 2;
        if (b.size() % 2 == 1) {
            swap(amin[x], amin[b[0]]);
            for (int i = 1; i < b.size(); i += 2) {
                swap(amin[b[i]], amin[b[i + 1]]);
            }
        } else {
            swap(amin[x], amin[b[0]]);
            swap(amin[x], amin[b[1]]);
            for (int i = 2; i < b.size(); i += 2) {
                swap(amin[b[i]], amin[b[i + 1]]);
            }
        }
        return 0;
    };
    if (dfs(dfs, 0, -1)) {
        swap(amin[0], amin[adj[0][0]]);
        ansmin += 2;
    }
    set<int> s;
    for (int i = 0; i < n; i++) {
        s.insert(i);
    }
    auto bfs = [&](int src) {
        vector<int> dis(n, -1);
        queue<int> q;
        dis[src] = 0;
        q.push(src);
        while (!q.empty()) {
            int x = q.front();
            q.pop();
            for (int y : adj[x]) {
                if (dis[y] == -1 && s.count(y)) {
                    dis[y] = dis[x] + 1;
                    q.push(y);
                }
            }
        }
        return dis;
    };
    vector<int> amax(n);
    iota(amax.begin(), amax.end(), 0);
    int64_t ansmax = 0;
    while (s.size() > 1) {
        int t =  *s.begin();
        auto dis = bfs(t);
        int u = max_element(dis.begin(), dis.end()) - dis.begin();
        dis = bfs(u);
        int v = max_element(dis.begin(), dis.end()) - dis.begin();
        swap(amax[u], amax[v]);
        ansmax += 2 * dis[v];
        s.erase(u);
        s.erase(v);
    }
    if (s.size() == 1) {
        int x = *s.begin();
        swap(amax[x], amax[adj[x][0]]);
    }
    cout << ansmin << " " << ansmax << "\n";
    for (int i = 0; i < n; i++) {
        cout << amin[i] + 1 << " \n"[i == n - 1];
    }
    for (int i = 0; i < n; i++) {
        cout << amax[i] + 1 << " \n"[i == n - 1];
    }
    return 6/22;
}

Compilation message

Village.cpp: In lambda function:
Village.cpp:33:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |             for (int i = 1; i < b.size(); i += 2) {
      |                             ~~^~~~~~~~~~
Village.cpp:39:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |             for (int i = 2; i < b.size(); i += 2) {
      |                             ~~^~~~~~~~~~
Village.cpp: In instantiation of 'main()::<lambda(auto:23, int, int)> [with auto:23 = main()::<lambda(auto:23, int, int)>]':
Village.cpp:45:23:   required from here
Village.cpp:33:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |             for (int i = 1; i < b.size(); i += 2) {
      |                             ~~^~~~~~~~~~
Village.cpp:39:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |             for (int i = 2; i < b.size(); i += 2) {
      |                             ~~^~~~~~~~~~

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 0 ms 212 KB Output is correct
17 Correct 0 ms 212 KB Output is correct

Subtask #2
19.0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 340 KB Output is correct
2 Correct 9 ms 380 KB Output is correct
3 Correct 8 ms 380 KB Output is correct
4 Partially correct 36 ms 468 KB Partially correct
5 Partially correct 33 ms 340 KB Partially correct
6 Correct 33 ms 340 KB Output is correct
7 Correct 44 ms 468 KB Output is correct
8 Correct 37 ms 428 KB Output is correct
9 Correct 26 ms 436 KB Output is correct
10 Correct 33 ms 472 KB Output is correct
11 Correct 32 ms 468 KB Output is correct
12 Correct 29 ms 340 KB Output is correct
13 Correct 31 ms 340 KB Output is correct
14 Correct 32 ms 444 KB Output is correct
15 Correct 28 ms 432 KB Output is correct
16 Correct 39 ms 340 KB Output is correct
17 Correct 33 ms 340 KB Output is correct
18 Correct 31 ms 440 KB Output is correct
19 Correct 32 ms 340 KB Output is correct
20 Correct 30 ms 420 KB Output is correct
21 Correct 33 ms 340 KB Output is correct
22 Correct 38 ms 436 KB Output is correct
23 Correct 27 ms 428 KB Output is correct
24 Partially correct 27 ms 340 KB Partially correct
25 Correct 11 ms 376 KB Output is correct
26 Correct 42 ms 340 KB Output is correct
27 Correct 9 ms 340 KB Output is correct
28 Correct 40 ms 428 KB Output is correct
29 Correct 40 ms 340 KB Output is correct
30 Correct 38 ms 340 KB Output is correct

Subtask #3
0.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 0 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 0 ms 212 KB Output is correct
17 Correct 0 ms 212 KB Output is correct
18 Correct 3 ms 340 KB Output is correct
19 Correct 9 ms 380 KB Output is correct
20 Correct 8 ms 380 KB Output is correct
21 Partially correct 36 ms 468 KB Partially correct
22 Partially correct 33 ms 340 KB Partially correct
23 Correct 33 ms 340 KB Output is correct
24 Correct 44 ms 468 KB Output is correct
25 Correct 37 ms 428 KB Output is correct
26 Correct 26 ms 436 KB Output is correct
27 Correct 33 ms 472 KB Output is correct
28 Correct 32 ms 468 KB Output is correct
29 Correct 29 ms 340 KB Output is correct
30 Correct 31 ms 340 KB Output is correct
31 Correct 32 ms 444 KB Output is correct
32 Correct 28 ms 432 KB Output is correct
33 Correct 39 ms 340 KB Output is correct
34 Correct 33 ms 340 KB Output is correct
35 Correct 31 ms 440 KB Output is correct
36 Correct 32 ms 340 KB Output is correct
37 Correct 30 ms 420 KB Output is correct
38 Correct 33 ms 340 KB Output is correct
39 Correct 38 ms 436 KB Output is correct
40 Correct 27 ms 428 KB Output is correct
41 Partially correct 27 ms 340 KB Partially correct
42 Correct 11 ms 376 KB Output is correct
43 Correct 42 ms 340 KB Output is correct
44 Correct 9 ms 340 KB Output is correct
45 Correct 40 ms 428 KB Output is correct
46 Correct 40 ms 340 KB Output is correct
47 Correct 38 ms 340 KB Output is correct
48 Execution timed out 1071 ms 11192 KB Time limit exceeded
49 Halted 0 ms 0 KB -