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#include <stdio.h>
#include <math.h>
#include <stdlib.h>  
#include <ctype.h>  
#include <algorithm>  
#include <vector>  
#include <string.h>  
#include <queue>  
#include <stack>  
#include <set>  
#include <map>  
#include <string>  
#include <sstream>  
#include <malloc.h>

using namespace std;
//结点编号0开始
const int MAXN = 1100;
int maze[MAXN][MAXN];
int gap[MAXN], dis[MAXN], pre[MAXN], cur[MAXN];
int sap(int start,int end,int nodenum)
{
    memset(cur, 0, sizeof(cur));
    memset(dis, 0, sizeof(dis));
    memset(gap, 0, sizeof(gap));
    int u = pre[start] = start, maxflow, aug = -1;
    gap[0] = nodenum;
    while (dis[start] < nodenum)
    {
        loop:
        for (int v = cur[u]; v < nodenum; v++)
            if (maze[u][v] && dis[u] == dis[v] + 1)
            {
                if (aug == -1 || aug > maze[u][v])
                    aug = maze[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])
                    {
                        maze[u][v] -= aug;
                        maze[v][u] += aug;
                    }
                    aug = -1;
                }
            goto loop;
            }
        int mindis = nodenum - 1;
        for (int v = 0; v < nodenum;v++)
            if (maze[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;
}

int main()
{
    return 0;
}