제출 #116684

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
116684		fleimgruber	Pipes (CEOI15_pipes)	C++17	30 / 100	3643 ms	65536 KiB

pipes

#include <bits/stdc++.h>

using namespace std;

//bridge finding
const int MAX_N = 100005;

int n,t,in[MAX_N];
vector<int> e[MAX_N];

int dfs(int i, int p = -1)
{
	in[i] = t++;
	int lo = in[i];
	for (int g : e[i])
	{
		if (g == p)
		{
			p = -1;
			continue;
		}
		if (in[g])
			lo = min(lo,in[g]);
		else
		{
			int lg = dfs(g,i);
			if (lg > in[i])
				printf("%d %d\n",i,g);
			lo = min(lo,lg);
		}
	}
	return lo;
}

void bridges()
{
	t = 1;
	for (int i=1; i<=n; i++)
		if (!in[i])
			dfs(i);
}
//-----

int main()
{
	int m,a,b;
	scanf("%d %d",&n,&m);
	//TODO simplify graph
	while (m--)
	{
		scanf("%d %d",&a,&b);
		e[a].push_back(b);
		e[b].push_back(a);
	}
	bridges();
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

pipes.cpp: In function 'int main()':
pipes.cpp:47:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d",&n,&m);
  ~~~~~^~~~~~~~~~~~~~~
pipes.cpp:51:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d",&a,&b);
   ~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10