105 lines
2.7 KiB
C++
105 lines
2.7 KiB
C++
#include <iostream>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <algorithm>
|
|
#include <queue>
|
|
#include <vector>
|
|
#include <map>
|
|
#include <set>
|
|
#include <string>
|
|
#include <math.h>
|
|
using namespace std;
|
|
const int MAXN=1100;
|
|
int maze[MAXN][MAXN];
|
|
int gap[MAXN],dis[MAXN],pre[MAXN],cur[MAXN];
|
|
int flow[MAXN][MAXN];
|
|
int sap(int start,int end,int nodenum)
|
|
{
|
|
memset(cur,0,sizeof(cur));
|
|
memset(dis,0,sizeof(dis));
|
|
memset(gap,0,sizeof(gap));
|
|
memset(flow,0,sizeof(flow));
|
|
int u=pre[start]=start,maxflow=0,aug=-1;
|
|
gap[0]=nodenum;
|
|
while(dis[start]<nodenum)
|
|
{
|
|
loop:
|
|
for(int v=cur[u];v<nodenum;v++)
|
|
if(maze[u][v]-flow[u][v] && dis[u]==dis[v]+1)
|
|
{
|
|
if(aug==-1 || aug>maze[u][v]-flow[u][v])aug=maze[u][v]-flow[u][v];
|
|
pre[v]=u;
|
|
u=cur[u]=v;
|
|
if(v==end)
|
|
{
|
|
maxflow+=aug;
|
|
for(u=pre[u];v!=start;v=u,u=pre[u])
|
|
{
|
|
flow[u][v]+=aug;
|
|
flow[v][u]-=aug;
|
|
}
|
|
aug=-1;
|
|
}
|
|
goto loop;
|
|
}
|
|
int mindis=nodenum-1;
|
|
for(int v=0;v<nodenum;v++)
|
|
if(maze[u][v]-flow[u][v]&&mindis>dis[v])
|
|
{
|
|
cur[u]=v;
|
|
mindis=dis[v];
|
|
}
|
|
if((--gap[dis[u]])==0)break;
|
|
gap[dis[u]=mindis+1]++;
|
|
u=pre[u];
|
|
}
|
|
return maxflow;
|
|
}
|
|
bool used[MAXN][MAXN];
|
|
int main()
|
|
{
|
|
int T;
|
|
int N,M,L,K;
|
|
scanf("%d",&T);
|
|
int iCase=0;
|
|
while(T--)
|
|
{
|
|
iCase++;
|
|
scanf("%d%d%d%d",&N,&M,&L,&K);
|
|
memset(maze,0,sizeof(maze));
|
|
int u,v;
|
|
memset(used,false,sizeof(used));
|
|
while(L--)
|
|
{
|
|
scanf("%d%d",&u,&v);
|
|
used[u][v]=true;
|
|
}
|
|
for(int i=N+1;i<=N+M;i++)maze[i][i+M]=K;
|
|
for(int i=1;i<=N;i++)
|
|
for(int j=1;j<=M;j++)
|
|
{
|
|
if(used[i][j])
|
|
{
|
|
maze[i][j+N+M]=1;
|
|
}
|
|
else maze[i][j+N]=1;
|
|
}
|
|
int ans=0;
|
|
int l=0,r=M;
|
|
while(l<=r)
|
|
{
|
|
int mid=(l+r)/2;
|
|
for(int i=1;i<=N;i++)maze[0][i]=mid;
|
|
for(int i=N+M+1;i<=N+2*M;i++)maze[i][N+2*M+1]=mid;
|
|
if(sap(0,N+2*M+1,N+2*M+2)==mid*N)
|
|
{
|
|
ans=mid;
|
|
l=mid+1;
|
|
}
|
|
else r=mid-1;
|
|
}
|
|
printf("Case %d: %d\n",iCase,ans);
|
|
}
|
|
return 0;
|
|
}
|