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답안 #321719

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
321719 2020-11-13T05:21:34 Z arujbansal Roadside Advertisements (NOI17_roadsideadverts) C++17
100 / 100
 134 ms 14956 KB 
#include <bits/stdc++.h>

#define FAST_IO ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr)
#define setIO(i, o) freopen(i, "r", stdin), freopen(o, "w", stdout)
#define seed() srand(chrono::steady_clock::now().time_since_epoch().count())
#define pb push_back
#define eb emplace_back
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define sz(x) (int) (x).size()
#define lc(i) 2*i
#define rc(i) 2*i+1
//#define int long long
using namespace std;
using ll = long long;
using ii = pair<int, int>;
using vii = vector<ii>;
using vi = vector<int>;
using vvi = vector<vi>;
using vb = vector<bool>;
using vvb = vector<vb>;

ll rng() {
    ll a = rand();
    ll b = rand();
    return a * (RAND_MAX + 1ll) + b;
}

const int N = 5e4 + 5, MOD = 1e9 + 7, INF = 1e9 + 5;
vii g[N];

struct LCA {
    int n, k, timer;
    vector<int> tin, tout;
    vector<vector<pair<int, int>>> par;

    void init(int x) {
        n = x;
        k = 31 - __builtin_clz(n);
        timer = 0;
        tin.resize(n);
        tout.resize(n);
        par.assign(n, vector<pair<int, int>>(k + 1, {0, 0}));
    }

    void dfs(int u = 0, int p = -1, int lastWt = 0) {
        tin[u] = timer++;

        par[u][0].first = (p == -1 ? 0 : p);
        par[u][0].second = lastWt;

        for (int j = 1; j <= k; j++) {
            par[u][j].first = par[par[u][j - 1].first][j - 1].first;
            par[u][j].second = par[u][j - 1].second + par[par[u][j - 1].first][j  - 1].second;
        }

        for (const auto &[v, wt] : g[u]) if (v != p) dfs(v, u, wt);
        tout[u] = timer - 1;
    }

    bool isAnc(int x, int v) {
        return tin[x] <= tin[v] && tout[x] >= tout[v];
    }

    int getLCA(int u, int v) {
        if (isAnc(u, v)) return u;
        if (isAnc(v, u)) return v;
        for (int j = k; j >= 0; j--) if (!isAnc(par[u][j].first, v)) u = par[u][j].first;
        return par[u][0].first;
    }

    int getCost(int u, int v) {
        if (u == v) return 0;

        int ans = 0;

        for (int j = k; j >= 0; j--) {
            if (isAnc(par[u][j].first, v)) continue;
            ans += par[u][j].second;
            u = par[u][j].first;
        }

        return ans + par[u][0].second;
    }
};

void solve() {
    int n;
    cin >> n;

    for (int i = 1; i < n; i++) {
        int u, v, w;
        cin >> u >> v >> w;

        g[u].eb(v, w);
        g[v].eb(u, w);
    }

    LCA binlift;
    binlift.init(n);
    binlift.dfs();

    int q;
    cin >> q;

    while (q--) {
        vi qry(5);
        for (auto &x : qry) cin >> x;

        sort(all(qry), [&](const auto &x, const auto &y) { return binlift.tin[x] < binlift.tin[y]; });

        int root = binlift.getLCA(qry[0], qry[1]);

        for (int i = 2; i < 5; i++)
            root = binlift.getLCA(root, qry[i]);

        int ans = binlift.getCost(qry[0], root);

        for (int i = 1; i < 5; i++) {
            int lca = binlift.getLCA(qry[i - 1], qry[i]);
            ans += binlift.getCost(qry[i], lca);
        }

        cout << ans << "\n";
    }
}

signed main() {
    FAST_IO;
#ifdef arujbansal_local
    setIO("input.txt", "output.txt");
#endif

    seed();

    int tc = 1;
//    cin >> tc;
    while (tc--) solve();
}

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 1516 KB Output is correct

Subtask #2
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 111 ms 13420 KB Output is correct
2 Correct 118 ms 14956 KB Output is correct
3 Correct 127 ms 14932 KB Output is correct
4 Correct 114 ms 14956 KB Output is correct
5 Correct 114 ms 14956 KB Output is correct
6 Correct 109 ms 14956 KB Output is correct
7 Correct 134 ms 14956 KB Output is correct
8 Correct 122 ms 14956 KB Output is correct
9 Correct 111 ms 14956 KB Output is correct
10 Correct 118 ms 14956 KB Output is correct

Subtask #3
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 45 ms 12160 KB Output is correct
2 Correct 77 ms 14316 KB Output is correct
3 Correct 69 ms 14316 KB Output is correct
4 Correct 70 ms 14456 KB Output is correct
5 Correct 72 ms 14316 KB Output is correct
6 Correct 69 ms 14316 KB Output is correct
7 Correct 70 ms 14316 KB Output is correct
8 Correct 80 ms 14316 KB Output is correct
9 Correct 70 ms 14316 KB Output is correct
10 Correct 70 ms 14316 KB Output is correct

Subtask #4
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 1516 KB Output is correct
2 Correct 111 ms 13420 KB Output is correct
3 Correct 118 ms 14956 KB Output is correct
4 Correct 127 ms 14932 KB Output is correct
5 Correct 114 ms 14956 KB Output is correct
6 Correct 114 ms 14956 KB Output is correct
7 Correct 109 ms 14956 KB Output is correct
8 Correct 134 ms 14956 KB Output is correct
9 Correct 122 ms 14956 KB Output is correct
10 Correct 111 ms 14956 KB Output is correct
11 Correct 118 ms 14956 KB Output is correct
12 Correct 45 ms 12160 KB Output is correct
13 Correct 77 ms 14316 KB Output is correct
14 Correct 69 ms 14316 KB Output is correct
15 Correct 70 ms 14456 KB Output is correct
16 Correct 72 ms 14316 KB Output is correct
17 Correct 69 ms 14316 KB Output is correct
18 Correct 70 ms 14316 KB Output is correct
19 Correct 80 ms 14316 KB Output is correct
20 Correct 70 ms 14316 KB Output is correct
21 Correct 70 ms 14316 KB Output is correct
22 Correct 116 ms 13420 KB Output is correct
23 Correct 67 ms 12140 KB Output is correct
24 Correct 123 ms 14444 KB Output is correct
25 Correct 117 ms 14444 KB Output is correct
26 Correct 116 ms 14444 KB Output is correct
27 Correct 117 ms 14444 KB Output is correct
28 Correct 114 ms 14444 KB Output is correct
29 Correct 112 ms 14444 KB Output is correct
30 Correct 113 ms 14544 KB Output is correct
31 Correct 114 ms 14444 KB Output is correct