delete pics to save space

history_source/信息学奥赛一本通/3.4.2.3.cpp

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+#include<iostream>
+#include<algorithm>
+using namespace std;
+int temp[5000], edge[505][505], k;
+int maxn, minn;
+void dfs(int v)
+{
+	for(int i=minn;i<=maxn;i++)
+		if(edge[v][i])
+		{
+			edge[v][i]--;
+			edge[i][v]--;
+			dfs(i);
+		}
+	temp[k++]=v;
+}
+int main()
+{
+	freopen("fence.in","r",stdin);
+	freopen("fence.out","w",stdout);
+	int first_point,second_point,i,edge_num;
+	cin>>edge_num;
+	minn=505;
+	maxn=0;
+	k=0;
+	for(i=0;i<edge_num;i++)
+	{
+		cin>>first_point>>second_point;
+		edge[first_point][second_point] ++;
+		edge[second_point][first_point] ++;
+		edge[first_point][0] ++;
+		edge[second_point][0] ++;
+		minn = min(minn,min(first_point,second_point));
+		maxn = max(maxn,max(first_point,second_point));
+	}
+	for(i = minn; i <= maxn; i ++)
+		if(edge[i][0]%2)
+		{
+			dfs(i);
+			break;
+		}
+	if(i==maxn+1) dfs(1);
+	for(int j=k-1;j>=0;j--)
+		printf("%d\n",temp[j]);
+	return 0;
+}