oj.uz

답안 #1102157

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1102157 2024-10-17T14:55:08 Z susanthenerd Roadside Advertisements (NOI17_roadsideadverts) C++17
100 / 100
 57 ms 10216 KB 
#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;
constexpr int LOG = 18;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n, timer = 0;
    cin >> n;
    vector<int> h(n + 1), d(n + 1), l(n + 1);
    vector<vector<pair<int, int> > > adj(n + 1);
    vector anc(LOG + 1, vector<int>(n + 1));


    for (int i = 1; i < n; ++i) {
        int u, v, w;
        cin >> u >> v >> w;
        adj[u + 1].emplace_back(v + 1, w);
        adj[v + 1].emplace_back(u + 1, w);
    }

    auto dfs = [&](auto &&self, int u, int p) -> void {
        anc[0][u] = p;
        l[u] = ++timer;

        for (int i = 1; i <= LOG; ++i)
            anc[i][u] = anc[i - 1][anc[i - 1][u]];

        for (auto &[v, w]: adj[u]) {
            if (v == p) continue;

            d[v] = d[u] + 1;
            h[v] = h[u] + w;
            self(self, v, u);
        }
    };

    dfs(dfs, 1, 0);

    auto lca = [&](int a, int b) {
        if (d[a] < d[b]) swap(a, b);

        for (int i = LOG; i >= 0; --i) {
            if (d[a] - (1 << i) >= d[b])
                a = anc[i][a];
        }

        if (a == b) {
            return a;
        } else {
            for (int i = LOG; i >= 0; --i) {
                if (anc[i][a] != anc[i][b]) {
                    a = anc[i][a];
                    b = anc[i][b];
                }
            }

            return anc[0][a];
        }
    };


    int q;
    cin >> q;

    auto dist = [&](int a, int b) {
        return h[a] + h[b] - 2 * h[lca(a, b)];
    };


    while (q--) {
        vector<int> arr(5);
        for (auto &it: arr) {
            cin >> it;
            it += 1;
        }
        sort(arr.begin(), arr.end(), [&](int a, int b) {
            return l[a] < l[b];
        });

        int ans = dist(lca(arr[0], arr[4]), arr[0]);
        for (int i = 0; i < 4; ++i)
            ans += dist(arr[i], arr[i + 1]);

        ans += dist(lca(arr[0], arr[4]), arr[4]);

        cout << ans / 2 << '\n';
    }
}

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 336 KB Output is correct

Subtask #2
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 54 ms 9300 KB Output is correct
2 Correct 55 ms 10216 KB Output is correct
3 Correct 56 ms 10120 KB Output is correct
4 Correct 53 ms 10216 KB Output is correct
5 Correct 54 ms 10180 KB Output is correct
6 Correct 54 ms 10120 KB Output is correct
7 Correct 52 ms 10120 KB Output is correct
8 Correct 56 ms 10124 KB Output is correct
9 Correct 56 ms 10120 KB Output is correct
10 Correct 57 ms 10112 KB Output is correct

Subtask #3
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 29 ms 8332 KB Output is correct
2 Correct 36 ms 9732 KB Output is correct
3 Correct 34 ms 9608 KB Output is correct
4 Correct 37 ms 9740 KB Output is correct
5 Correct 38 ms 9608 KB Output is correct
6 Correct 36 ms 9608 KB Output is correct
7 Correct 37 ms 9608 KB Output is correct
8 Correct 34 ms 9608 KB Output is correct
9 Correct 35 ms 9592 KB Output is correct
10 Correct 42 ms 9616 KB Output is correct

Subtask #4
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 54 ms 9300 KB Output is correct
3 Correct 55 ms 10216 KB Output is correct
4 Correct 56 ms 10120 KB Output is correct
5 Correct 53 ms 10216 KB Output is correct
6 Correct 54 ms 10180 KB Output is correct
7 Correct 54 ms 10120 KB Output is correct
8 Correct 52 ms 10120 KB Output is correct
9 Correct 56 ms 10124 KB Output is correct
10 Correct 56 ms 10120 KB Output is correct
11 Correct 57 ms 10112 KB Output is correct
12 Correct 29 ms 8332 KB Output is correct
13 Correct 36 ms 9732 KB Output is correct
14 Correct 34 ms 9608 KB Output is correct
15 Correct 37 ms 9740 KB Output is correct
16 Correct 38 ms 9608 KB Output is correct
17 Correct 36 ms 9608 KB Output is correct
18 Correct 37 ms 9608 KB Output is correct
19 Correct 34 ms 9608 KB Output is correct
20 Correct 35 ms 9592 KB Output is correct
21 Correct 42 ms 9616 KB Output is correct
22 Correct 57 ms 9352 KB Output is correct
23 Correct 41 ms 8840 KB Output is correct
24 Correct 54 ms 10036 KB Output is correct
25 Correct 52 ms 9972 KB Output is correct
26 Correct 54 ms 10060 KB Output is correct
27 Correct 57 ms 10056 KB Output is correct
28 Correct 56 ms 10120 KB Output is correct
29 Correct 56 ms 10128 KB Output is correct
30 Correct 57 ms 10032 KB Output is correct
31 Correct 55 ms 10120 KB Output is correct