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답안 #854595

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
854595 2023-09-28T06:32:22 Z The_Samurai Hard route (IZhO17_road) C++17
52 / 100
 2000 ms 56900 KB 
#include "bits/stdc++.h"
using namespace std;
using ll = long long;
const int inf = 1e9, N = 1e6 + 5;

int root;
ll ans = -1, cnt = 0;
vector<vector<int>> g;
vector<int> longest;
vector<bool> vis;

void dfs1(int u) {
    longest[u] = vis[u] = true;
    for (int v: g[u]) {
        if (!vis[v]) {
            dfs1(v);
            longest[u] = max(longest[u], longest[v] + 1);
        }
    }
}

void dfs2(int u, int mx, int dist) {
    int mx1 = mx, mx2 = 0;
    vis[u] = true;
    for (int v: g[u]) {
        if (vis[v]) continue;
        if (mx1 < longest[v]) {
            mx2 = mx1;
            mx1 = longest[v];
        } else {
            mx2 = max(mx2, longest[v]);
        }
    }
    for (int v: g[u]) {
        if (!vis[v]) {
            if (mx1 == longest[v]) dfs2(v, mx2, dist + 1);
            else dfs2(v, mx1, dist + 1);
        }
    }
    if (g[u].size() == 1 and u != root) {
        if (ans < 1ll * dist * mx) {
            ans = 1ll * dist * mx;
            cnt = 1;
        } else if (ans == 1ll * dist * mx) {
            cnt++;
        }
    }
}

int main() {
    cin.tie(0)->sync_with_stdio(false);
#ifdef sunnatov
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#else
//    freopen("game.in", "r", stdin);
//    freopen("game.out", "w", stdout);
#endif

    int n;
    cin >> n;
    g.assign(n + 1, {});
    for (int i = 1; i < n; i++) {
        int u, v;
        cin >> u >> v;
        g[u].emplace_back(v);
        g[v].emplace_back(u);
    }
    for (int i = 1; i <= n; i++) {
        if (g[i].size() > 1) continue;
        root = i;
        longest.assign(n + 1, 0);
        vis.assign(n + 1, false);
        dfs1(i);
        vis.assign(n + 1, false);
        dfs2(i, 0, 0);
    }
    cout << ans << ' ' << cnt / 2;
}

Subtask #1
19.0 / 19.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 464 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 1 ms 500 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 1 ms 344 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 456 KB Output is correct
17 Correct 0 ms 344 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 1 ms 856 KB Output is correct
22 Correct 0 ms 344 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct

Subtask #2
33.0 / 33.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 464 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 1 ms 500 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 1 ms 344 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 456 KB Output is correct
17 Correct 0 ms 344 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 1 ms 856 KB Output is correct
22 Correct 0 ms 344 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 165 ms 860 KB Output is correct
26 Correct 156 ms 976 KB Output is correct
27 Correct 172 ms 1016 KB Output is correct
28 Correct 171 ms 972 KB Output is correct
29 Correct 287 ms 860 KB Output is correct
30 Correct 250 ms 1112 KB Output is correct
31 Correct 267 ms 964 KB Output is correct
32 Correct 262 ms 968 KB Output is correct
33 Correct 3 ms 860 KB Output is correct
34 Correct 3 ms 860 KB Output is correct
35 Correct 3 ms 860 KB Output is correct
36 Correct 3 ms 980 KB Output is correct
37 Correct 2 ms 1116 KB Output is correct
38 Correct 2 ms 1116 KB Output is correct
39 Correct 3 ms 860 KB Output is correct
40 Correct 4 ms 860 KB Output is correct
41 Correct 5 ms 836 KB Output is correct
42 Correct 11 ms 728 KB Output is correct
43 Correct 20 ms 604 KB Output is correct
44 Correct 41 ms 956 KB Output is correct
45 Correct 80 ms 748 KB Output is correct
46 Correct 103 ms 712 KB Output is correct
47 Correct 250 ms 604 KB Output is correct
48 Correct 358 ms 804 KB Output is correct

Subtask #3
0 / 48.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 464 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 1 ms 500 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 1 ms 344 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 456 KB Output is correct
17 Correct 0 ms 344 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 1 ms 856 KB Output is correct
22 Correct 0 ms 344 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 165 ms 860 KB Output is correct
26 Correct 156 ms 976 KB Output is correct
27 Correct 172 ms 1016 KB Output is correct
28 Correct 171 ms 972 KB Output is correct
29 Correct 287 ms 860 KB Output is correct
30 Correct 250 ms 1112 KB Output is correct
31 Correct 267 ms 964 KB Output is correct
32 Correct 262 ms 968 KB Output is correct
33 Correct 3 ms 860 KB Output is correct
34 Correct 3 ms 860 KB Output is correct
35 Correct 3 ms 860 KB Output is correct
36 Correct 3 ms 980 KB Output is correct
37 Correct 2 ms 1116 KB Output is correct
38 Correct 2 ms 1116 KB Output is correct
39 Correct 3 ms 860 KB Output is correct
40 Correct 4 ms 860 KB Output is correct
41 Correct 5 ms 836 KB Output is correct
42 Correct 11 ms 728 KB Output is correct
43 Correct 20 ms 604 KB Output is correct
44 Correct 41 ms 956 KB Output is correct
45 Correct 80 ms 748 KB Output is correct
46 Correct 103 ms 712 KB Output is correct
47 Correct 250 ms 604 KB Output is correct
48 Correct 358 ms 804 KB Output is correct
49 Execution timed out 2050 ms 56900 KB Time limit exceeded
50 Halted 0 ms 0 KB -