Submission #6382789


Source Code Expand

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#include<bits/stdc++.h>
#define fo(i,a,b) for(int i=a;i<=b;i++)
using namespace std;

const int maxn=1e5+5;

int n,m;

int tot,go[2*maxn],id[2*maxn],nxt[2*maxn],f1[maxn];
void ins(int x,int y,int i)
{
	go[++tot]=y;
	id[tot]=i;
	nxt[tot]=f1[x];
	f1[x]=tot;
}

bool vis[maxn],dfn[maxn],dg[maxn];
int e[maxn][2],e0;
void dfs(int k,int last)
{
	dfn[k]=1;
	for(int p=f1[k]; p; p=nxt[p]) if (!vis[id[p]])
	{
		vis[id[p]]=1;
		if (!dfn[go[p]])
		{
			dfs(go[p],k);
		} else
		{
			e[++e0][0]=k, e[e0][1]=go[p];
			dg[k]^=1;
		}
	}
	if (!last) return;
	if (dg[k]) e[++e0][0]=k, e[e0][1]=last;
		else e[++e0][0]=last, e[e0][1]=k, dg[last]^=1;
}

int main()
{
	scanf("%d %d",&n,&m);
	fo(i,1,m)
	{
		int x,y;
		scanf("%d %d",&x,&y);
		ins(x,y,i), ins(y,x,i);
	}
	
	dfs(1,0);
	
	if (dg[1]) puts("-1"); else
	{
		fo(i,1,m) printf("%d %d\n",e[i][0],e[i][1]);
	}
}

Submission Info

Submission Time
Task B - Even Degrees
User kqp
Language C++14 (GCC 5.4.1)
Score 700
Code Size 904 Byte
Status AC
Exec Time 42 ms
Memory 9856 KB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:42:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d",&n,&m);
                      ^
./Main.cpp:46:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d",&x,&y);
                       ^

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 700 / 700
Status
AC × 2
AC × 36
Set Name Test Cases
Sample s1.txt, s2.txt
All 01.txt, 02.txt, 03.txt, 04.txt, 05.txt, 06.txt, 07.txt, 08.txt, 09.txt, 10.txt, 11.txt, 12.txt, 13.txt, 14.txt, 15.txt, 16.txt, 17.txt, 18.txt, 19.txt, 20.txt, 21.txt, 22.txt, 23.txt, 24.txt, 25.txt, 26.txt, 27.txt, 28.txt, 29.txt, 30.txt, 31.txt, 32.txt, 33.txt, 34.txt, s1.txt, s2.txt
Case Name Status Exec Time Memory
01.txt AC 41 ms 5248 KB
02.txt AC 42 ms 5248 KB
03.txt AC 41 ms 5248 KB
04.txt AC 42 ms 5248 KB
05.txt AC 28 ms 4096 KB
06.txt AC 42 ms 6400 KB
07.txt AC 41 ms 6400 KB
08.txt AC 41 ms 6400 KB
09.txt AC 42 ms 6400 KB
10.txt AC 28 ms 5248 KB
11.txt AC 37 ms 4864 KB
12.txt AC 37 ms 4864 KB
13.txt AC 37 ms 4864 KB
14.txt AC 37 ms 4864 KB
15.txt AC 24 ms 3968 KB
16.txt AC 37 ms 4480 KB
17.txt AC 37 ms 4480 KB
18.txt AC 37 ms 4480 KB
19.txt AC 37 ms 4480 KB
20.txt AC 23 ms 3584 KB
21.txt AC 35 ms 4224 KB
22.txt AC 35 ms 4224 KB
23.txt AC 35 ms 4224 KB
24.txt AC 35 ms 4224 KB
25.txt AC 22 ms 3456 KB
26.txt AC 25 ms 7040 KB
27.txt AC 25 ms 8192 KB
28.txt AC 39 ms 9856 KB
29.txt AC 40 ms 9856 KB
30.txt AC 1 ms 256 KB
31.txt AC 1 ms 256 KB
32.txt AC 1 ms 256 KB
33.txt AC 1 ms 256 KB
34.txt AC 1 ms 256 KB
s1.txt AC 1 ms 256 KB
s2.txt AC 1 ms 256 KB