POJ 1155 TELE
树上分组背包，没什么好说的。
坑：Discuss里面提到的滚动数组减少内存怎么破。
/*
Author : Speedcell
Update : 2013-05-30
Version : soppYcell 2.2(a)
*/
#include <algorithm>
#include <iostream>
#include <fstream>
#include <sstream>
#include <iomanip>
#include <map>
#include <set>
#include <list>
#include <stack>
#include <queue>
#include <deque>
#include <vector>
#include <string>
#include <bitset>
#include <memory>
#include <complex>
#include <numeric>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <time.h>
#include <ctype.h>
#include <locale.h>
using namespace std;
#pragma pack(4)
#ifndef __CONSTANT__
#define __CONSTANT__
typedef long long LONG;
const double pi = acos(-1.0);
const int inf = 0x7f7f7f7f;
const LONG INF = 0x7f7f7f7f7f7f7f7fll;
const int go[8][2] = {{0,1},{0,-1},{1,0},{-1,0},{1,1},{1,-1},{-1,1},{-1,-1}};
#endif // __CONSTANT__
#ifndef __IO__
#define __IO__
inline bool RD(int & a) {return scanf("%d",&a)!=EOF;}
inline bool RD(char & a) {return scanf("%c",&a)!=EOF;}
inline bool RD(char * a) {return scanf("%s", a)!=EOF;}
inline bool RD(double & a) {return scanf("%lf",&a)!=EOF;}
inline bool RD(LONG & a) {return scanf("%I64d",&a)!=EOF;}
template<class T1> inline bool
IN(T1 & a) {return RD(a);}
template<class T1,class T2> inline bool
IN(T1 & a,T2 & b) {return RD(a)&&RD(b);}
template<class T1,class T2,class T3> inline bool
IN(T1 & a,T2 & b,T3 & c) {return RD(a)&&RD(b)&&RD(c);}
template<class T1,class T2,class T3,class T4> inline bool
IN(T1 & a,T2 & b,T3 & c,T4 & d) {return RD(a)&&RD(b)&&RD(c)&&RD(d);}
template<class T1,class T2,class T3,class T4,class T5> inline bool
IN(T1 & a,T2 & b,T3 & c,T4 & d,T5 & e) {return RD(a)&&RD(b)&&RD(c)&&RD(d)&&RD(e);}
template<class T1,class T2,class T3,class T4,class T5,class T6> inline bool
IN(T1 & a,T2 & b,T3 & c,T4 & d,T5 & e,T6 & f) {return RD(a)&&RD(b)&&RD(c)&&RD(d)&&RD(e)&&RD(f);}
template<class T1,class T2,class T3,class T4,class T5,class T6,class T7> inline bool
IN(T1 & a,T2 & b,T3 & c,T4 & d,T5 & e,T6 & f,T7 & g) {return RD(a)&&RD(b)&&RD(c)&&RD(d)&&RD(e)&&RD(f)&&RD(g);}
inline void PT(int a) {printf("%d",a);}
inline void PT(char a) {printf("%c",a);}
inline void PT(char * a) {printf("%s",a);}
inline void PT(double a) {printf("%f",a);}
inline void PT(LONG a) {printf("%I64d",a);}
inline void PT(const char a[]) {printf("%s",a);}
template<class T1> inline void
OT(T1 a) {PT(a);}
template<class T1,class T2> inline void
OT(T1 a,T2 b) {PT(a),PT(' '),PT(b);}
template<class T1,class T2,class T3> inline void
OT(T1 a,T2 b,T3 c) {PT(a),PT(' '),PT(b),PT(' '),PT(c);}
template<class T1,class T2,class T3,class T4> inline void
OT(T1 a,T2 b,T3 c,T4 d) {PT(a),PT(' '),PT(b),PT(' '),PT(c),PT(' '),PT(d);}
template<class T1,class T2,class T3,class T4,class T5> inline void
OT(T1 a,T2 b,T3 c,T4 d,T5 e) {PT(a),PT(' '),PT(b),PT(' '),PT(c),PT(' '),PT(d),PT(' '),PT(e);}
template<class T1,class T2,class T3,class T4,class T5,class T6> inline void
OT(T1 a,T2 b,T3 c,T4 d,T5 e,T6 f) {PT(a),PT(' '),PT(b),PT(' '),PT(c),PT(' '),PT(d),PT(' '),PT(e),PT(' '),PT(f);}
template<class T1,class T2,class T3,class T4,class T5,class T6,class T7> inline void
OT(T1 a,T2 b,T3 c,T4 d,T5 e,T6 f,T7 g) {PT(a),PT(' '),PT(b),PT(' '),PT(c),PT(' '),PT(d),PT(' '),PT(e),PT(' '),PT(f),PT(' '),PT(g);}
template<class T1> inline void
OL(T1 a) {PT(a),PT('\n');}
template<class T1,class T2> inline void
OL(T1 a,T2 b) {PT(a),PT(' '),PT(b),PT('\n');}
template<class T1,class T2,class T3> inline void
OL(T1 a,T2 b,T3 c) {PT(a),PT(' '),PT(b),PT(' '),PT(c),PT('\n');}
template<class T1,class T2,class T3,class T4> inline void
OL(T1 a,T2 b,T3 c,T4 d) {PT(a),PT(' '),PT(b),PT(' '),PT(c),PT(' '),PT(d),PT('\n');}
template<class T1,class T2,class T3,class T4,class T5> inline void
OL(T1 a,T2 b,T3 c,T4 d,T5 e) {PT(a),PT(' '),PT(b),PT(' '),PT(c),PT(' '),PT(d),PT(' '),PT(e),PT('\n');}
template<class T1,class T2,class T3,class T4,class T5,class T6> inline void
OL(T1 a,T2 b,T3 c,T4 d,T5 e,T6 f) {PT(a),PT(' '),PT(b),PT(' '),PT(c),PT(' '),PT(d),PT(' '),PT(e),PT(' '),PT(f),PT('\n');}
template<class T1,class T2,class T3,class T4,class T5,class T6,class T7> inline void
OL(T1 a,T2 b,T3 c,T4 d,T5 e,T6 f,T7 g) {PT(a),PT(' '),PT(b),PT(' '),PT(c),PT(' '),PT(d),PT(' '),PT(e),PT(' '),PT(f),PT(' '),PT(g),PT('\n');}
#endif // __IO__
#ifndef __MACRO__
#define __MACRO__
#define ML(times) int tcase; IN(tcase); FOR(times,1,tcase)
#define FOR(i,a,b) for(int i=int(a),_##i=int(b);i<=_##i;i++)
#define DWN(i,b,a) for(int i=int(b),_##i=int(a);_##i<=i;i--)
#define ECH(i,u,pre,next) for(int i=int(pre[u]);i!=-1;i=int(next[i]))
#define MEM(a,v) memset(a,v,sizeof(a))
#define CLR(a,v) FOR(_i##a,0,sizeof(a)/sizeof(a[0])-1) a[_i##a]=v
#define LOOP(a,n) \
FOR(_i##a,0,(n)-1) \
OT(a[_i##a]),OT(_i##a!=__i##a?' ':'\n')
#define LOOP2(a,n,m) \
FOR(_i##a,0,(n)-1) FOR(_j##a,0,(m)-1) \
OT(a[_i##a][_j##a]),OT(_j##a!=__j##a?' ':'\n')
#define LOOPG(G,n,pre,next) \
FOR(_i##a,0,(n)-1) ECH(_j##a,_i##a,pre,next) \
OL(_i##a,G[_j##a].v,G[_j##a].w)
#endif // __MACRO__
#ifndef __BIT__
#define __BIT__
template<class T> inline T lb(T i) {return i&-i;}
template<class T> inline T lc(T i) {return i<<1;}
template<class T> inline T rc(T i) {return i<<1|1;}
template<class T> inline T at(T a,int i) {return a& (T(1)<<i);}
template<class T> inline T nt(T a,int i) {return a^ (T(1)<<i);}
template<class T> inline T s1(T a,int i) {return a| (T(1)<<i);}
template<class T> inline T s0(T a,int i) {return a&~(T(1)<<i);}
#endif // __BIT__
#ifndef __DOUBLE__
#define __DOUBLE__
const double eps = 1e-8;
inline int cmp(double a,double b=0) {return fabs(a-b)<eps?0:((a-b)>eps?+1:-1);}
inline double fmax(double a,double b) {return cmp(a,b)>0?a:b;}
inline double fmin(double a,double b) {return cmp(a,b)<0?a:b;}
#endif // __DOUBLE__
const int MAXV = 3002;
const int MAXE = MAXV;
struct node
{
int v,w;
}G[MAXE];
int _index,pre[MAXV],next[MAXE];
void clear(void)
{
_index=0;
MEM(pre,-1);
}
void add(int u,int v,int w)
{
G[_index].v=v;
G[_index].w=w;
next[_index]=pre[u];
pre[u]=_index++;
}
int n,m,k,a,c,cost[MAXV],dp[MAXV][MAXV];
void DP(int u)
{
FOR(i,0,n) dp[u][i]=-inf;
if(cost[u]!=-1) dp[u][1]=cost[u];
else
{
dp[u][0]=0;
ECH(i,u,pre,next)
{
int v=G[i].v;
int w=G[i].w;
DP(v);
DWN(j,n,0) if(dp[u][j]!=-inf)
{
DWN(k,n,1) if(dp[v][k]!=-inf)
{
dp[u][j+k]=max(dp[u][j+k],dp[u][j]+dp[v][k]-w);
}
}
}
}
}
int solve(int n)
{
DP(1);
DWN(i,n,0) if(dp[1][i]>=0) return i;
}
int main()
{
#ifndef ONLINE_JUDGE
freopen("TELE.txt","r",stdin);
#else
#endif
while(IN(n,m))
{
clear();
FOR(i,1,n-m)
{
IN(k);
FOR(j,1,k)
{
IN(a,c);
add(i,a,c);
}
}
MEM(cost,-1);
FOR(i,n-m+1,n) IN(cost[i]);
OL(solve(n));
}
return 0;
}