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| #include<iostream>
#include<cstdio>
#include<algorithm>
#include<queue>
using namespace std;
int m,p=1,s1,s2,t[10001],f[10001];
struct str
{
int m,q,r;
}a[1000001];
void road(int x,int y,int r)
{
a[++p].m=y;
a[p].q=t[x];
t[x]=p;
a[p].r=r;
}
bool bfs()
{
queue<int> Q;
Q.push(s1);
for(int i=0;i<=127;++i) f[i]=0;
f[s1]=1;
while(!Q.empty())
{
int k=Q.front();
Q.pop();
for(int i=t[k];i!=0;i=a[i].q)
{
if(f[a[i].m]==0&&a[i].r!=0)
{
f[a[i].m]=f[k]+1;
Q.push(a[i].m);
}
}
}
return f[s2]!=0;
}
int dfs(int x,int r)
{
if(x==s2) return r;
int s=0;
for(int i=t[x];i!=0;i=a[i].q)
{
if(f[a[i].m]==f[x]+1&&a[i].r!=0)
{
int z=dfs(a[i].m,min(r,a[i].r));
if(z!=0)
{
a[i].r-=z;
a[i^1].r+=z;
r-=z;
s+=z;
}
}
}
return s;
}
int main()
{
scanf("%d",&m);
s1='A';
s2='Z';
for(int i=1;i<=m;++i)
{
char x,y;
x=getchar();
while((x<'A'||x>'Z')&&(x<'a'||x>'z')) x=getchar();
y=getchar();
while((y<'A'||y>'Z')&&(y<'a'||y>'z')) y=getchar();
int r;
scanf("%d",&r);
road(int(x),int(y),r);
road(int(y),int(x),0);
}
int r=0;
while(bfs())
{
r+=dfs(s1,1e9);
}
printf("%d",r);
return 0;
}
|