【csp模拟赛九】--dfs2

　　dfs

代码：

#include<algorithm>
#include<iostream>
#include<cstdio>
using namespace std;
int n,m,p,q,ans1,ans2,len;
int ans[35],sum[35];
bool ok[35];
struct haochi
{
	int zl,jg,ctb;  
	int tot,dr[35];
	friend bool operator < (const haochi &x,const haochi &y)
	{ return x.zl<y.zl; }
}yu[35];
void dfs(int hao,int lei,int qian)
{
	if(qian>m)return;
	if(hao==n+1)
	{
		if((lei>ans1)||(lei==ans1&&qian>ans2))
		{
			len=0;
			for(int i=1;i<=n;++i)
			if(ok[i])ans[++len]=i;
			ans1=lei;
			ans2=qian;
		}
		return;
	}
	if(lei+(n-hao+1)<ans1 || (lei+(n-hao+1) ==ans1 && qian+sum[hao]<=ans2))return;
	if(yu[hao].ctb)
	{
		dfs(hao+1,lei,qian);
		return;
	}
	ok[hao]=1;
	for(int i=1;i<=yu[hao].tot;++i)yu[yu[hao].dr[i]].ctb++;
	dfs(hao+1,lei+1,qian+yu[hao].jg);
	ok[hao]=0;
	for(int i=1;i<=yu[hao].tot;++i)yu[yu[hao].dr[i]].ctb--;

	dfs(hao+1,lei,qian);
}
int main()
{
	freopen("fish.in","r",stdin);
	freopen("fish.out","w",stdout);
	cin>>m>>n;
	for(int i=1;i<=n;++i) scanf("%d%d",&yu[i].zl,&yu[i].jg);
	sort(yu+1,yu+1+n);
	for(int i=n;i>=1;i--)sum[i]=sum[i+1]+yu[i].jg;
	while(scanf("%d%d",&p,&q)&&p&&q)
	{
		yu[p].dr[++yu[p].tot]=q;
		yu[q].dr[++yu[q].tot]=p;
	}
	dfs(1,0,0);
	cout<<ans1<<" "<<ans2<<endl;
	for(int i=1;i<=len;i++)printf("%d\n",ans[i]);
	fclose(stdin);fclose(stdout);
	return 0;
}
/*
170 7
1 70
2 50
3 30
4 40
5 40
6 30
7 20
1 4
1 7
3 4
3 5
5 7
6 7
0 0
*/