同错，#7大概400多行开始出现错误
```cpp
#include<iostream>
using namespace std;
const int MAXN=501,MAXM=1024;
int n,m,d[MAXN],ans[MAXM],s[MAXN][MAXN],inx=0;
int MAX(int a,int b){
return a>b?a:b;
}
void DFS(int x){
ans[inx]=x;
for(int i=1;i<=n;i++){
if(s[x][i]>0){
s[i][x]--;
s[x][i]--;
inx++;
DFS(i);
inx--;
}
}
return;
}
int main(){
scanf("%d",&m);
for(int i=1;i<=m;i++){
int start,end;
scanf("%d%d",&start,&end);
s[start][end]++;
s[end][start]++;
d[start]++;
d[end]++;
n=MAX(MAX(start,end),n);
}
int indx=1;
for(int i=1;i<=n;i++){
if(d[i]%2){
indx=i;
break;
}
}
DFS(indx);
for(int i=0;i<=m;i++)printf("%d\n",ans[i]);
return 0;
}
```
by ZY_85 @ 2023-07-24 11:27:32
同问
by lxyt_415x @ 2023-08-09 18:50:01