oj.uz

Submission #782122

# Submission time Handle Problem Language Result Execution time Memory
782122 2023-07-13T15:29:00 Z bane Connecting Supertrees (IOI20_supertrees) C++17
100 / 100
 209 ms 28132 KB 
#include <bits/stdc++.h>
#include "supertrees.h"

using namespace std;

struct DisjointSetUnion{
	int N;
	vector<int>sz;
	vector<int>link;
	DisjointSetUnion(int n): N(n){
		sz.resize(n);
		link.resize(n);
		for (int i = 0; i < n; i++){
			link[i] = i;
			sz[i] = 1;
		}
	}

	int Find(int a){
		if (a == link[a])return a;
		return link[a] = Find(link[a]);
	}

	bool Unite(int a, int b){
		a = Find(a), b = Find(b);
		if (a == b)return false;
		if (sz[a] < sz[b])swap(a,b);
		sz[a] += sz[b];
		link[b] = a;
		return true;
	}
};


class Uniderected_Graph{
	public:
		int N, mx = 0, far = 0;
		vector<vector<int>>adj;
		vector<int>Visited;
		Uniderected_Graph(int _N) : N(_N){
			adj.resize(N);
			Visited.resize(N);
			Visited.assign(N,0);
		}

		void Add_Edge(int A, int B){
			adj[A].push_back(B);
			adj[B].push_back(A);
		}

		void Far(int u, int p, int depth = 0){
			if (depth > mx){
				mx = depth;
				far = u;
			}
			Visited[u] = 1;
			for (int& nxt : adj[u]){
				if (nxt == p)continue;
				Far(nxt, u, depth + 1);
			}
		}

		pair<int,int> Find_Diameter(int Source){
			mx = -1, far = 0;
			Far(Source,Source,0);
			int A = far;
			mx = -1, far = 0;
			Far(A,A,0);
			int B = far;
			return make_pair(A,B);
		}

		void Dfs(int u,vector<int>& p){
			if (Visited[u])return;
			Visited[u] = 1;
			p.push_back(u);
			for (int& nxt : adj[u]){
				Dfs(nxt, p);
			}
		}

		vector<int>pracka(int Source){
			vector<int>ans;
			Dfs(Source,ans);
			return ans;
		}
};



int construct(vector<vector<int>> p) {
	int n = (int)p.size();
	vector<vector<int>>adj(n,vector<int>(n));
	DisjointSetUnion DSU(n + 1);
	for (int i = 0; i < n; i++){
		for (int j = i + 1; j < n; j++){
			if (p[i][j] == 3)return 0;
			if (p[i][j] == 1){
				DSU.Unite(i,j);
			}
		}
	}

	//check if all p[i][j] = 1 in trees, otherwise contradiction
	for (int i = 0; i < n; i++){
		for (int j = i + 1; j < n; j++){
			int A = DSU.Find(i) , B = DSU.Find(j);
			if (p[i][j] != 1 && A == B){
				return 0;
			}
			if (A != i){
				adj[A][i] = adj[i][A] = 1;
			}
			if (B!=j){
				adj[B][j] = adj[j][B] = 1;
			}
		}
	}


	//All good

	//merge trees in cycle
	Uniderected_Graph G(n+1);

	for (int i = 0; i < n; i++){
		for (int j = i + 1; j < n; j++){
			int A = DSU.Find(i), B = DSU.Find(j);
			if (A == B)continue;
			//Different component
			if (p[A][B] == 2){
				G.Add_Edge(A,B);
			}
		}
	}


	for (int i = 0; i < n; i++){
		if (G.Visited[i])continue;
		auto response = G.pracka(i);
		if (response.size() == 1)continue;
		if (response.size() == 2)return 0;
		adj[response[0]][response.back()] = 1;
		adj[response.back()][response[0]] = 1;
		DSU.Unite(response.back(), response[0]);
		for (int j = 1; j < (int)response.size(); j++){

			adj[response[j]][response[j-1]] = 1;
			adj[response[j-1]][response[j]] = 1;
			DSU.Unite(response[j],response[j-1]);
		}
	}

	//check if trees merged in cycle and have p[i][j] = 0, should be in another component
	//check if all needed are in same component
	for (int i = 0; i < n; i++){
		for (int j = i + 1; j < n; j++){
			int A = DSU.Find(i) , B = DSU.Find(j);
			if (p[i][j] == 0 && A == B)return 0;
			if (p[i][j] != 0 && A != B)return 0;
		}
	}

	build(adj);
	return 1;
}

Subtask #1
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 7 ms 1212 KB Output is correct
7 Correct 153 ms 23916 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 7 ms 1212 KB Output is correct
7 Correct 153 ms 23916 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 300 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 8 ms 1176 KB Output is correct
13 Correct 166 ms 23844 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 216 KB Output is correct
16 Correct 4 ms 852 KB Output is correct
17 Correct 82 ms 13988 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 50 ms 6176 KB Output is correct
21 Correct 209 ms 24040 KB Output is correct
22 Correct 155 ms 24012 KB Output is correct
23 Correct 200 ms 24080 KB Output is correct
24 Correct 145 ms 23924 KB Output is correct
25 Correct 61 ms 14108 KB Output is correct
26 Correct 71 ms 14064 KB Output is correct
27 Correct 155 ms 23920 KB Output is correct
28 Correct 149 ms 24060 KB Output is correct

Subtask #3
19.0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 300 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 1 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 1 ms 216 KB Output is correct
8 Correct 6 ms 1176 KB Output is correct
9 Correct 188 ms 23924 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 9 ms 1460 KB Output is correct
13 Correct 202 ms 28132 KB Output is correct
14 Correct 1 ms 300 KB Output is correct
15 Correct 1 ms 212 KB Output is correct
16 Correct 3 ms 980 KB Output is correct
17 Correct 74 ms 16896 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 37 ms 6328 KB Output is correct
22 Correct 155 ms 24568 KB Output is correct
23 Correct 149 ms 24056 KB Output is correct
24 Correct 182 ms 27264 KB Output is correct
25 Correct 66 ms 14068 KB Output is correct
26 Correct 67 ms 14580 KB Output is correct
27 Correct 152 ms 24012 KB Output is correct
28 Correct 158 ms 26080 KB Output is correct
29 Correct 62 ms 14068 KB Output is correct

Subtask #4
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 296 KB Output is correct
4 Correct 38 ms 6232 KB Output is correct
5 Correct 163 ms 23968 KB Output is correct
6 Correct 155 ms 23984 KB Output is correct
7 Correct 156 ms 24032 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 47 ms 6276 KB Output is correct
10 Correct 148 ms 24580 KB Output is correct
11 Correct 186 ms 24072 KB Output is correct
12 Correct 163 ms 27124 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 300 KB Output is correct
16 Correct 45 ms 6212 KB Output is correct
17 Correct 175 ms 24512 KB Output is correct
18 Correct 163 ms 24600 KB Output is correct
19 Correct 162 ms 24188 KB Output is correct
20 Correct 171 ms 23936 KB Output is correct

Subtask #5
21.0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 7 ms 1212 KB Output is correct
7 Correct 153 ms 23916 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 300 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 8 ms 1176 KB Output is correct
13 Correct 166 ms 23844 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 216 KB Output is correct
16 Correct 4 ms 852 KB Output is correct
17 Correct 82 ms 13988 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 50 ms 6176 KB Output is correct
21 Correct 209 ms 24040 KB Output is correct
22 Correct 155 ms 24012 KB Output is correct
23 Correct 200 ms 24080 KB Output is correct
24 Correct 145 ms 23924 KB Output is correct
25 Correct 61 ms 14108 KB Output is correct
26 Correct 71 ms 14064 KB Output is correct
27 Correct 155 ms 23920 KB Output is correct
28 Correct 149 ms 24060 KB Output is correct
29 Correct 1 ms 300 KB Output is correct
30 Correct 0 ms 212 KB Output is correct
31 Correct 0 ms 212 KB Output is correct
32 Correct 1 ms 212 KB Output is correct
33 Correct 0 ms 212 KB Output is correct
34 Correct 0 ms 212 KB Output is correct
35 Correct 1 ms 216 KB Output is correct
36 Correct 6 ms 1176 KB Output is correct
37 Correct 188 ms 23924 KB Output is correct
38 Correct 0 ms 212 KB Output is correct
39 Correct 1 ms 212 KB Output is correct
40 Correct 9 ms 1460 KB Output is correct
41 Correct 202 ms 28132 KB Output is correct
42 Correct 1 ms 300 KB Output is correct
43 Correct 1 ms 212 KB Output is correct
44 Correct 3 ms 980 KB Output is correct
45 Correct 74 ms 16896 KB Output is correct
46 Correct 1 ms 212 KB Output is correct
47 Correct 1 ms 212 KB Output is correct
48 Correct 1 ms 212 KB Output is correct
49 Correct 37 ms 6328 KB Output is correct
50 Correct 155 ms 24568 KB Output is correct
51 Correct 149 ms 24056 KB Output is correct
52 Correct 182 ms 27264 KB Output is correct
53 Correct 66 ms 14068 KB Output is correct
54 Correct 67 ms 14580 KB Output is correct
55 Correct 152 ms 24012 KB Output is correct
56 Correct 158 ms 26080 KB Output is correct
57 Correct 62 ms 14068 KB Output is correct
58 Correct 1 ms 296 KB Output is correct
59 Correct 1 ms 296 KB Output is correct
60 Correct 3 ms 852 KB Output is correct
61 Correct 69 ms 14080 KB Output is correct
62 Correct 1 ms 304 KB Output is correct
63 Correct 1 ms 212 KB Output is correct
64 Correct 1 ms 212 KB Output is correct
65 Correct 39 ms 6200 KB Output is correct
66 Correct 71 ms 14720 KB Output is correct
67 Correct 79 ms 14068 KB Output is correct
68 Correct 95 ms 14192 KB Output is correct
69 Correct 71 ms 14064 KB Output is correct

Subtask #6
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 7 ms 1212 KB Output is correct
7 Correct 153 ms 23916 KB Output is correct
8 Correct 1 ms 212 KB Output is correct
9 Correct 1 ms 300 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 8 ms 1176 KB Output is correct
13 Correct 166 ms 23844 KB Output is correct
14 Correct 1 ms 212 KB Output is correct
15 Correct 1 ms 216 KB Output is correct
16 Correct 4 ms 852 KB Output is correct
17 Correct 82 ms 13988 KB Output is correct
18 Correct 1 ms 212 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 50 ms 6176 KB Output is correct
21 Correct 209 ms 24040 KB Output is correct
22 Correct 155 ms 24012 KB Output is correct
23 Correct 200 ms 24080 KB Output is correct
24 Correct 145 ms 23924 KB Output is correct
25 Correct 61 ms 14108 KB Output is correct
26 Correct 71 ms 14064 KB Output is correct
27 Correct 155 ms 23920 KB Output is correct
28 Correct 149 ms 24060 KB Output is correct
29 Correct 1 ms 300 KB Output is correct
30 Correct 0 ms 212 KB Output is correct
31 Correct 0 ms 212 KB Output is correct
32 Correct 1 ms 212 KB Output is correct
33 Correct 0 ms 212 KB Output is correct
34 Correct 0 ms 212 KB Output is correct
35 Correct 1 ms 216 KB Output is correct
36 Correct 6 ms 1176 KB Output is correct
37 Correct 188 ms 23924 KB Output is correct
38 Correct 0 ms 212 KB Output is correct
39 Correct 1 ms 212 KB Output is correct
40 Correct 9 ms 1460 KB Output is correct
41 Correct 202 ms 28132 KB Output is correct
42 Correct 1 ms 300 KB Output is correct
43 Correct 1 ms 212 KB Output is correct
44 Correct 3 ms 980 KB Output is correct
45 Correct 74 ms 16896 KB Output is correct
46 Correct 1 ms 212 KB Output is correct
47 Correct 1 ms 212 KB Output is correct
48 Correct 1 ms 212 KB Output is correct
49 Correct 37 ms 6328 KB Output is correct
50 Correct 155 ms 24568 KB Output is correct
51 Correct 149 ms 24056 KB Output is correct
52 Correct 182 ms 27264 KB Output is correct
53 Correct 66 ms 14068 KB Output is correct
54 Correct 67 ms 14580 KB Output is correct
55 Correct 152 ms 24012 KB Output is correct
56 Correct 158 ms 26080 KB Output is correct
57 Correct 62 ms 14068 KB Output is correct
58 Correct 1 ms 212 KB Output is correct
59 Correct 1 ms 212 KB Output is correct
60 Correct 1 ms 296 KB Output is correct
61 Correct 38 ms 6232 KB Output is correct
62 Correct 163 ms 23968 KB Output is correct
63 Correct 155 ms 23984 KB Output is correct
64 Correct 156 ms 24032 KB Output is correct
65 Correct 1 ms 212 KB Output is correct
66 Correct 47 ms 6276 KB Output is correct
67 Correct 148 ms 24580 KB Output is correct
68 Correct 186 ms 24072 KB Output is correct
69 Correct 163 ms 27124 KB Output is correct
70 Correct 1 ms 212 KB Output is correct
71 Correct 1 ms 212 KB Output is correct
72 Correct 1 ms 300 KB Output is correct
73 Correct 45 ms 6212 KB Output is correct
74 Correct 175 ms 24512 KB Output is correct
75 Correct 163 ms 24600 KB Output is correct
76 Correct 162 ms 24188 KB Output is correct
77 Correct 171 ms 23936 KB Output is correct
78 Correct 1 ms 296 KB Output is correct
79 Correct 1 ms 296 KB Output is correct
80 Correct 3 ms 852 KB Output is correct
81 Correct 69 ms 14080 KB Output is correct
82 Correct 1 ms 304 KB Output is correct
83 Correct 1 ms 212 KB Output is correct
84 Correct 1 ms 212 KB Output is correct
85 Correct 39 ms 6200 KB Output is correct
86 Correct 71 ms 14720 KB Output is correct
87 Correct 79 ms 14068 KB Output is correct
88 Correct 95 ms 14192 KB Output is correct
89 Correct 71 ms 14064 KB Output is correct
90 Correct 1 ms 212 KB Output is correct
91 Correct 1 ms 212 KB Output is correct
92 Correct 3 ms 800 KB Output is correct
93 Correct 65 ms 14064 KB Output is correct
94 Correct 1 ms 300 KB Output is correct
95 Correct 1 ms 212 KB Output is correct
96 Correct 1 ms 212 KB Output is correct
97 Correct 15 ms 3700 KB Output is correct
98 Correct 66 ms 14068 KB Output is correct
99 Correct 75 ms 14088 KB Output is correct
100 Correct 64 ms 14084 KB Output is correct
101 Correct 62 ms 14028 KB Output is correct
102 Correct 60 ms 14064 KB Output is correct
103 Correct 99 ms 14064 KB Output is correct
104 Correct 68 ms 14076 KB Output is correct
105 Correct 67 ms 14072 KB Output is correct