oj.uz

Submission #766760

# Submission time Handle Problem Language Result Execution time Memory
766760 2023-06-26T07:04:05 Z raysh07 Cat Exercise (JOI23_ho_t4) C++17
31 / 100
 2000 ms 67412 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define INF (int)1e18
#define f first
#define s second

mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());

struct Tree {
	vector<vector<int>> adj, lift;	
	vector<int> d, tin, tout;
	int n, timer;
	bool initialized = false;
	bool dfsed = false;

	void init(int nn){
		n = nn;
		adj.resize(n + 1);
		d.resize(n + 1);
		lift.resize(n + 1);
		tin.resize(n + 1);
		tout.resize(n + 1);
		for (int i = 1; i <= n; i++) adj[i].clear();
		for (int i = 0; i <= n; i++) lift[i].resize(20, 0);
		initialized = true;
	}

	void addEdge(int u, int v){
		if (!initialized){
			cout << "STUPID INITIALIZE\n";
			exit(0);
		}
		adj[u].push_back(v);
		adj[v].push_back(u);
	}

	void build(){
		for (int j = 1; j < 20; j++){
			for (int i = 1; i <= n; i++){
				lift[i][j] = lift[lift[i][j - 1]][j - 1];
			}
		}
	}

	void dfs(int u, int par){
		tin[u] = ++timer;
		for (int v : adj[u]){
			if (v != par){
				d[v] = d[u] + 1;
				lift[v][0] = u;
				dfs(v, u);
			}
		}
		tout[u] = timer;
	}

	void dfs(int root = 1){
		if (!initialized){
			cout << "STUPID INITIALIZE\n";
			exit(0);
		}
		d[root] = 0;
		timer = 0;
		dfs(root, -1);
		build();
		dfsed = true;
	}

	int lca(int a, int b){
		if (!dfsed){
			cout << "STUPID DFS\n";
			exit(0);
		}
		if (d[a] < d[b]) swap(a, b);
		int del = d[a] - d[b];
		for (int i = 0; i < 20; i++) if (del >> i & 1) a = lift[a][i];

		if (a == b) return a;

		for (int i = 19; i >= 0; i--) if (lift[a][i] != lift[b][i]){
			a = lift[a][i];
			b = lift[b][i];
		}
		return lift[a][0];
	}

	int dist(int a, int b){
		return d[a] + d[b] - 2 * d[lca(a, b)];
	}
};

struct ufds{
	vector <int> root, sz;
	int n;

	void init(int nn){
		n = nn;
		root.resize(n + 1);
		sz.resize(n + 1, 1);
		for (int i = 1; i <= n; i++) root[i] = i;
	}

	int find(int x){
		if (root[x] == x) return x;
		return root[x] = find(root[x]);
	}

	bool unite(int x, int y){
		x = find(x); y = find(y);
		if (x == y) return false;

		if (sz[y] > sz[x]) swap(x, y);
		sz[x] += sz[y];
		root[y] = x;
		return true;
	}
};

void Solve(){
	int n; cin >> n;
	vector <int> p(n + 1);
	for (int i = 1; i <= n; i++) cin >> p[i];

	Tree G;
	G.init(n);

	for (int i = 1; i < n; i++){
		int u, v; cin >> u >> v;
		G.addEdge(p[u], p[v]);
	}
	G.dfs();

	vector <int> dp(n + 1, 0);
	ufds uf;
	uf.init(n);
	for (int i = 2; i <= n; i++){
		for (int v : G.adj[i]){
			if (v < i){
				uf.unite(v, i);
			}
		}

		for (int j = 1; j < i; j++){
			if (uf.find(j) == uf.find(i)){
				dp[i] = max(dp[i], dp[j] + G.dist(i, j));
			}
		}
	}

	cout << dp[n] << "\n";
}

int32_t main() 
{
    auto begin = std::chrono::high_resolution_clock::now();
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int t = 1;
  //  cin >> t;
    for(int i = 1; i <= t; i++) 
    {
        //cout << "Case #" << i << ": ";
        Solve();
    }
    auto end = std::chrono::high_resolution_clock::now();
    auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin);
    cerr << "Time measured: " << elapsed.count() * 1e-9 << " seconds.\n"; 
    return 0;
}

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 324 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 324 KB Output is correct
5 Correct 1 ms 316 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 324 KB Output is correct
10 Correct 0 ms 212 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 324 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 324 KB Output is correct
5 Correct 1 ms 316 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 324 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 3 ms 340 KB Output is correct
12 Correct 3 ms 340 KB Output is correct
13 Correct 3 ms 328 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 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

# Verdict Execution time Memory Grader output
1 Correct 1 ms 324 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 324 KB Output is correct
5 Correct 1 ms 316 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 324 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 3 ms 340 KB Output is correct
12 Correct 3 ms 340 KB Output is correct
13 Correct 3 ms 328 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 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 1101 ms 2004 KB Output is correct
19 Correct 730 ms 2072 KB Output is correct
20 Correct 715 ms 2068 KB Output is correct
21 Correct 59 ms 2004 KB Output is correct
22 Correct 60 ms 2004 KB Output is correct
23 Correct 59 ms 2008 KB Output is correct
24 Correct 60 ms 2060 KB Output is correct

Subtask #4
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 324 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 324 KB Output is correct
5 Correct 1 ms 316 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 324 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 3 ms 340 KB Output is correct
12 Correct 3 ms 340 KB Output is correct
13 Correct 3 ms 328 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 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 1101 ms 2004 KB Output is correct
19 Correct 730 ms 2072 KB Output is correct
20 Correct 715 ms 2068 KB Output is correct
21 Correct 59 ms 2004 KB Output is correct
22 Correct 60 ms 2004 KB Output is correct
23 Correct 59 ms 2008 KB Output is correct
24 Correct 60 ms 2060 KB Output is correct
25 Correct 1 ms 212 KB Output is correct
26 Correct 530 ms 2036 KB Output is correct
27 Correct 526 ms 2052 KB Output is correct
28 Correct 524 ms 2032 KB Output is correct
29 Correct 529 ms 2124 KB Output is correct
30 Correct 85 ms 1876 KB Output is correct
31 Correct 103 ms 1924 KB Output is correct
32 Correct 94 ms 1920 KB Output is correct
33 Correct 101 ms 1924 KB Output is correct

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 324 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 324 KB Output is correct
5 Correct 1 ms 316 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 324 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 3 ms 340 KB Output is correct
12 Correct 3 ms 340 KB Output is correct
13 Correct 3 ms 328 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 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 1101 ms 2004 KB Output is correct
19 Correct 730 ms 2072 KB Output is correct
20 Correct 715 ms 2068 KB Output is correct
21 Correct 59 ms 2004 KB Output is correct
22 Correct 60 ms 2004 KB Output is correct
23 Correct 59 ms 2008 KB Output is correct
24 Correct 60 ms 2060 KB Output is correct
25 Execution timed out 2027 ms 67412 KB Time limit exceeded
26 Halted 0 ms 0 KB -

Subtask #6
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 324 KB Output is correct
3 Execution timed out 2064 ms 65384 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #7
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 324 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 324 KB Output is correct
5 Correct 1 ms 316 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 324 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 3 ms 340 KB Output is correct
12 Correct 3 ms 340 KB Output is correct
13 Correct 3 ms 328 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 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 1101 ms 2004 KB Output is correct
19 Correct 730 ms 2072 KB Output is correct
20 Correct 715 ms 2068 KB Output is correct
21 Correct 59 ms 2004 KB Output is correct
22 Correct 60 ms 2004 KB Output is correct
23 Correct 59 ms 2008 KB Output is correct
24 Correct 60 ms 2060 KB Output is correct
25 Correct 1 ms 212 KB Output is correct
26 Correct 530 ms 2036 KB Output is correct
27 Correct 526 ms 2052 KB Output is correct
28 Correct 524 ms 2032 KB Output is correct
29 Correct 529 ms 2124 KB Output is correct
30 Correct 85 ms 1876 KB Output is correct
31 Correct 103 ms 1924 KB Output is correct
32 Correct 94 ms 1920 KB Output is correct
33 Correct 101 ms 1924 KB Output is correct
34 Execution timed out 2027 ms 67412 KB Time limit exceeded
35 Halted 0 ms 0 KB -