Submission #736547

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
736547	2023-05-05T22:41:38 Z	rahulverma	Network (BOI15_net)	Java 11	0 / 100	163 ms	11448 KB

net

import java.io.*;
import java.util.*;

public class net {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		int n = s.nextInt();
		ArrayList<ArrayList<Integer>> graph = new ArrayList<>();
		for(int i = 0; i < n; i++) graph.add(new ArrayList<Integer>());
		for(int i = 1; i < n; i++) {
			int v1 = s.nextInt() - 1;
			int v2 = s.nextInt() - 1;
			graph.get(v1).add(v2);
			graph.get(v2).add(v1);
		}
		boolean found = true;
		ArrayList<Integer> ans = new ArrayList<Integer>();
		for(int i = 0; i < n; i++) {
			if(graph.get(i).size() == 1) {
				ans.add(i+1);
				if(i == 0) found = true;
			}
		}
		if(found) ans.add(1);
		Collections.sort(ans, Collections.reverseOrder());
		System.out.println((int) ans.size()/2);
		for(int i = 0; i < ans.size()/2; i += 1) {
			System.out.println(ans.get(2*i) + " " + ans.get(2*i + 1));
		}
	}

}

Subtask #1

0 / 18.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	143 ms	11288 KB	Output is correct
2	Correct	146 ms	11396 KB	Output is correct
3	Correct	152 ms	11172 KB	Output is correct
4	Correct	163 ms	11292 KB	Output is correct
5	Correct	143 ms	11232 KB	Output is correct
6	Correct	152 ms	11376 KB	Output is correct
7	Incorrect	149 ms	11448 KB	Breaking single line is causing network to disconnect.
8	Halted	0 ms	0 KB	-

Subtask #2

0 / 45.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	143 ms	11288 KB	Output is correct
2	Correct	146 ms	11396 KB	Output is correct
3	Correct	152 ms	11172 KB	Output is correct
4	Correct	163 ms	11292 KB	Output is correct
5	Correct	143 ms	11232 KB	Output is correct
6	Correct	152 ms	11376 KB	Output is correct
7	Incorrect	149 ms	11448 KB	Breaking single line is causing network to disconnect.
8	Halted	0 ms	0 KB	-

Subtask #3

0 / 37.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	143 ms	11288 KB	Output is correct
2	Correct	146 ms	11396 KB	Output is correct
3	Correct	152 ms	11172 KB	Output is correct
4	Correct	163 ms	11292 KB	Output is correct
5	Correct	143 ms	11232 KB	Output is correct
6	Correct	152 ms	11376 KB	Output is correct
7	Incorrect	149 ms	11448 KB	Breaking single line is causing network to disconnect.
8	Halted	0 ms	0 KB	-