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# re: http://acm.hit.edu.cn/ojs/show.php?Proid=2543&Contestid=0

/*************************************************************************
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Author: WHU_GCC
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Created Time: 2007-9-17 17:52:25
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File Name: hit2543.cpp
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Description:
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************************************************************************/
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#include <iostream>
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using namespace std;
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#define out(x) (cout<<#x<<": "<<x<<endl)
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const int maxint=0xFFFFFFF;
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typedef long long int64;
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const int64 maxint64 = 0xFFFFFFFFFFFFFFFLL;
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template<class T>void show(T a, int n){for(int i=0; i<n; ++i) cout<<a[i]<<' '; cout<<endl;}
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template<class T>void show(T a, int r, int l){for(int i=0; i<r; ++i)show(a[i],l);cout<<endl;}
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const int maxn = 1100;
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struct _adj
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{
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int v, c, f, w;
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_adj *next, *dup;
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int getw()
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{
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if (f < -c)
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return -w;
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if (f < c)
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return 0;
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return w;
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}
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int getc()
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{
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if (f < -c)
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return -c - f;
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if (f < c)
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return c - f;
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return maxint;
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}
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} *adj[maxn], *st[maxn];
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int stt, trm, n, c, p;
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int d[maxn];
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int cost;
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int bell()
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{
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int bfs[maxn];
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bool hash[maxn];
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fill (hash + 1, hash + 1 + n, 0);
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fill (d + 1, d + 1 + n, maxint);
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_adj*pt;
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hash[stt] = 1;
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d[stt] = 0;
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bfs[0] = stt;
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int v;
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for (int s = 0, t = 1; s != t;s = (s + 1) % n, hash[v] = 0)
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for (pt = adj[v = bfs[s]]; pt; pt = pt->next)
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if (d[v] + pt->getw() < d[pt->v])
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{
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// out(pt->getw());
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// out(v);
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// out(pt->v);
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d[pt->v] = d[v] + pt->getw();
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// out(d[pt->v]);
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st[pt->v] = pt;
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if (hash[pt->v] == 0)
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{
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hash[pt->v] = 1;
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bfs[t++] = pt->v;
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t %= n;
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}
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// system ("pause");
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}
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// out(1);
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if (d[trm] == maxint)
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return 0;
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int ans = maxint;
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for (v = trm; v != stt; v = st[v]->dup->v)
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{
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ans <?= st[v]->getc();
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}
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// out(ans);
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return ans;
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}
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void insert(int u, int v, int c, int w)
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{
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// printf ("%d %d %d %d\n", u, v, c, w);
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_adj* pt;
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pt = new _adj;
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pt->v = v; pt->c = c; pt->f = 0; pt->w = w; pt->next = adj[u];
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adj[u] = pt;
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pt->dup = new _adj;
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_adj *qt = pt->dup;
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qt->v = u; qt->c = c; qt->f = 0; qt->w = w; qt->next = adj[v]; qt->dup = pt;
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adj[v] = qt;
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}
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int mincostmaxflow ()
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{
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int flow = 0;
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cost = 0;
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int f;
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while ((f = bell()))
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{
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// out(f);
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if (f == maxint || f * (p + d[trm]) >= c)
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{
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return flow + c / (p + ::d[trm]);
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}
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flow += f;
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c -= f * p + ::d[trm] * f;
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for (int x = trm; x != stt; x = st[x]->dup->v)
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{
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st[x]->f += f;
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st[x]->dup->f -= f;
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}
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}
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return flow;
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}
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int work ()
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{
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return mincostmaxflow ();
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}
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void init ()
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{
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int n, m, c, p;
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scanf ("%d %d %d %d", &n, &m, &c, &p);
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memset (adj, 0, sizeof (adj));
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while (m--)
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{
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int u, v, cc, w;
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scanf ("%d %d %d %d", &u, &v, &cc, &w);
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++u;
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++v;
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insert (u, v, cc, w);
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}
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::n = n;
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::c = c;
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::p = p;
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stt = 1;
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trm = 2;
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}
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int main()
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{
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int T;
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scanf ("%d", &T);
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while (T--)
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{
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init ();
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printf ("%d\n", work ());
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}
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return 0;
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}
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WHUGCC 評論于 2007-09-17 21:00 回復更多評論

http://acm.hit.edu.cn/ojs/show.php?Proid=2543&Contestid=0

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