From Evernote:

uva 452

對我來說是新的題目，不過好懂

但因為忘記歸零 WA了好幾千次..

[sourcecode language="cpp"]
//============================================================================
// Name : Project Scheduling.cpp
// Date : 2014 2013/3/1 上午11:33:07
// Author : GCA
//============================================================================
#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <climits>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <cctype>
#include <utility>
using namespace std;
typedef long long ll;
typedef unsigned int uint;
#define Set(a,s) memset(a,s,sizeof(a))
#define Write(w) freopen(w,"w",stdout)
#define Read(r) freopen(r,"r",stdin)
#define Pln() printf("\n")
#define I_de(x,n)for(int i=0;i<n;i++)printf("%d ",x[i]);Pln()
#define De(x)printf(#x"%d\n",x)
#define For(i,x)for(int i=0;i<x;i++)
#define CON(x,y) x##y
#define Pmz(dp,nx,ny)for(int hty=0;hty<ny;hty++){for(int htx=0;htx<nx;htx++){\
printf("%d ",dp[htx][hty]);}Pln();}
#define M 100005
#define PII pair<int,int>
#define PB push_back
#define oo INT_MAX
#define Set_oo 0x3f
#define Is_debug true
#define debug(...) if(Is_debug)printf("DEBUG: "),printf(__VA_ARGS__)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin();it!=(c).end();it++)
#define eps 1e-6
bool xdy(double x,double y){return x>y+eps;}
bool xddy(double x,double y){return x>y-eps;}
bool xcy(double x,double y){return x<y-eps;}
bool xcdy(double x,double y){return x<y+eps;}
int min3(int x,int y,int z){
int tmp=min(x,y);
return min(tmp,z);
}
int max3(int x,int y,int z){
int tmp=max(x,y);
return max(tmp,z);
}
int mz[30][30];
int w[30],s[30],e[30],have[30];
int en,sn;
int q[M],front,rear;

void solve(){
int used[30],maxin[30];
Set(used,0);
Set(maxin,0);
int ans=0;
while(1){
int flag=0;
for(int i=0;i<30;i++){
if(!used[i]&&have[i]){
int tmp=0,j;
for(j=0;j<30;j++){
if(mz[j][i]){
if(!used[j])break;
tmp=max(maxin[j],tmp);
// index=j;
}

}
if(j==30){
// debug("%d->%d=%d\n",index,i,maxin[i]);
maxin[i]=tmp+w[i];
ans=max(ans,maxin[i]);
used[i]=1;
flag=1;
}
}
}
if(!flag)break;
}

printf("%d\n",ans);
}
int main() {
ios_base::sync_with_stdio(0);
int test;
char str[10000],ss[100];
scanf("%d%*c",&test);
getchar();
while(test--){
en=sn=0;
Set(mz,0);
Set(w,0);
while(gets(str)){
if(str[0]=='\0')break;
char to;
int tw,len;
sscanf(str,"%s%d",ss,&tw);
to=ss[0];
w[to-'A']=tw;
have[to-'A']=1;
len=strlen(str);
for(int i=len-1;i>=0;i--){
if(!isalpha(str[i])) break;
char from=str[i];
have[from-'A']=1;
mz[from-'A'][to-'A']=1;
// debug("mz[%d][%d]=%d\n",from-'A',to-'A',1);
}
}
solve();
if(test)Pln();
}

}

[/sourcecode]