oj.uz

답안 #405182

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
405182 2021-05-15T20:28:06 Z T0p_ Network (BOI15_net) C++14
0 / 100
 1 ms 304 KB 
#include <bits/stdc++.h>
using namespace std;

int deg[500005];

int main()
{
	int n;
	scanf(" %d",&n);
	for(int i=1 ; i<n ; i++)
	{
		int u, v;
		scanf(" %d %d",&u,&v);
		deg[u]++, deg[v]++;
	}
	vector<int> v;
	for(int i=1 ; i<=n ; i++)
		if(deg[i] == 1) v.push_back(i);
	int sz = v.size();
	printf("%d\n",(sz+1)>>1);
	for(int i=1 ; i<sz ; i+=2)
		printf("%d %d\n",v[i-1],v[i]);
	if(sz%2) printf("%d %d\n",v[sz-2], v[sz-1]);
	return 0;
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:9:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |  scanf(" %d",&n);
      |  ~~~~~^~~~~~~~~~
net.cpp:13:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |   scanf(" %d %d",&u,&v);
      |   ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 256 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 304 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Incorrect 1 ms 204 KB Breaking single line is causing network to disconnect.
11 Halted 0 ms 0 KB -

Subtask #2
0 / 45.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 256 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 304 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Incorrect 1 ms 204 KB Breaking single line is causing network to disconnect.
11 Halted 0 ms 0 KB -

Subtask #3
0 / 37.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 256 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 304 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Incorrect 1 ms 204 KB Breaking single line is causing network to disconnect.
11 Halted 0 ms 0 KB -