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답안 #768567

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
768567 2023-06-28T09:09:35 Z green_gold_dog Cat Exercise (JOI23_ho_t4) C++17
41 / 100
 235 ms 85532 KB 
#include<bits/stdc++.h>

using namespace std;

typedef long long ll;

const ll LOG = 20;

template<typename T>
bool assign_min(T& a, T b) {
        if (a > b) {
                a = b;
                return true;
        }
        return false;
}

template<typename T>
bool assign_max(T& a, T b) {
        if (a < b) {
                a = b;
                return true;
        }
        return false;
}

struct DSU {
        vector<ll> p;
        DSU(ll n) {
                p.resize(n, 0);
                for (ll i = 0; i < n; i++) {
                        p[i] = i;
                }
        }
        ll get(ll x) {
                return (p[x] == x ? x : p[x] = get(p[x]));
        }
        void unite(ll a, ll b) {
                p[b] = a;
        }
};

struct LCA {
        vector<vector<ll>> tree;
        vector<ll> h;
        vector<vector<ll>> binup;
        LCA(vector<vector<ll>> tree): tree(tree) {
                ll n = tree.size();
                h.resize(n, -1);
                binup.resize(n, vector<ll>(LOG, 0));
                dfs(0, 0);
        }
        void dfs(ll v, ll p) {
                h[v] = h[p] + 1;
                binup[v][0] = p;
                for (ll i = 1; i < LOG; i++) {
                        binup[v][i] = binup[binup[v][i - 1]][i - 1];
                }
                for (auto i : tree[v]) {
                        if (i != p) {
                                dfs(i, v);
                        }
                }
        }
        ll la(ll v, ll x) {
                for (ll i = LOG - 1; i >= 0; i--) {
                        if (x >= (1 << i)) {
                                v = binup[v][i];
                                x -= (1 << i);
                        }
                }
                return v;
        }
        ll lca(ll v, ll u) {
                if (h[v] < h[u]) {
                        swap(v, u);
                }
                v = la(v, h[v] - h[u]);
                if (v == u) {
                        return v;
                }
                for (ll i = LOG - 1; i >= 0; i--) {
                        if (binup[v][i] != binup[u][i]) {
                                v = binup[v][i];
                                u = binup[u][i];
                        }
                }
                return binup[v][1];
        }
        ll dist(ll v, ll u) {
                return h[v] + h[u] - h[lca(v, u)] * 2;
        }
};

void solve() {
        ll n;
        cin >> n;
        vector<pair<ll, ll>> arr(n);
        for (ll i = 0; i < n; i++) {
                cin >> arr[i].first;
                arr[i].second = i;
        }
        sort(arr.begin(), arr.end());
        vector<vector<ll>> tree(n);
        for (ll i = 1; i < n; i++) {
                ll a, b;
                cin >> a >> b;
                a--;
                b--;
                tree[a].push_back(b);
                tree[b].push_back(a);
        }
        DSU d(n);
        LCA l(tree);
        vector<ll> dp(n, -1);
        ll ans = 0;
        for (auto[_, i] : arr) {
                dp[i] = 0;
                for (auto j : tree[i]) {
                        if (dp[j] >= 0) {
                                ll x = d.get(j);
                                assign_max(dp[i], dp[x] + l.dist(i, x));
                                d.unite(i, x);
                        }
                }
                ans = dp[i];
        }
        cout << ans << '\n';
}

int main() {
        ios_base::sync_with_stdio(false);
        cin.tie(0);
        cout.tie(0);
        solve();
}

Subtask #1
7.0 / 7.0

# 결과 실행 시간 메모리 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

Subtask #2
7.0 / 7.0

# 결과 실행 시간 메모리 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 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct

Subtask #3
7.0 / 7.0

# 결과 실행 시간 메모리 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 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 4 ms 2400 KB Output is correct
19 Correct 4 ms 2388 KB Output is correct
20 Correct 5 ms 2344 KB Output is correct
21 Correct 4 ms 2388 KB Output is correct
22 Correct 4 ms 2388 KB Output is correct
23 Correct 4 ms 2388 KB Output is correct
24 Correct 4 ms 2388 KB Output is correct

Subtask #4
0 / 10.0

# 결과 실행 시간 메모리 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 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 4 ms 2400 KB Output is correct
19 Correct 4 ms 2388 KB Output is correct
20 Correct 5 ms 2344 KB Output is correct
21 Correct 4 ms 2388 KB Output is correct
22 Correct 4 ms 2388 KB Output is correct
23 Correct 4 ms 2388 KB Output is correct
24 Correct 4 ms 2388 KB Output is correct
25 Correct 0 ms 212 KB Output is correct
26 Correct 4 ms 2260 KB Output is correct
27 Incorrect 4 ms 2388 KB Output isn't correct
28 Halted 0 ms 0 KB -

Subtask #5
20.0 / 20.0

# 결과 실행 시간 메모리 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 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 4 ms 2400 KB Output is correct
19 Correct 4 ms 2388 KB Output is correct
20 Correct 5 ms 2344 KB Output is correct
21 Correct 4 ms 2388 KB Output is correct
22 Correct 4 ms 2388 KB Output is correct
23 Correct 4 ms 2388 KB Output is correct
24 Correct 4 ms 2388 KB Output is correct
25 Correct 165 ms 85432 KB Output is correct
26 Correct 167 ms 85452 KB Output is correct
27 Correct 191 ms 85532 KB Output is correct
28 Correct 222 ms 85504 KB Output is correct
29 Correct 235 ms 85500 KB Output is correct
30 Correct 221 ms 85500 KB Output is correct
31 Correct 223 ms 85492 KB Output is correct

Subtask #6
0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Incorrect 0 ms 340 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #7
0 / 26.0

# 결과 실행 시간 메모리 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 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 4 ms 2400 KB Output is correct
19 Correct 4 ms 2388 KB Output is correct
20 Correct 5 ms 2344 KB Output is correct
21 Correct 4 ms 2388 KB Output is correct
22 Correct 4 ms 2388 KB Output is correct
23 Correct 4 ms 2388 KB Output is correct
24 Correct 4 ms 2388 KB Output is correct
25 Correct 0 ms 212 KB Output is correct
26 Correct 4 ms 2260 KB Output is correct
27 Incorrect 4 ms 2388 KB Output isn't correct
28 Halted 0 ms 0 KB -