最大流最小割

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <algorithm>
#include <climits>
#include <cstring>
#include <string>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <vector>
#include <list>
#define rep(i,m,n) for(i=m;i<=n;i++)
#define rsp(it,s) for(set<int>::iterator it=s.begin();it!=s.end();it++)
#define mod 1000000007
#define inf 0x3f3f3f3f
#define vi vector<int>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define ll long long
#define pi acos(-1.0)
#define pii pair<int,int>
#define Lson L, mid, rt<<1
#define Rson mid+1, R, rt<<1|1
const int maxn=5e2+10;
using namespace std;
ll gcd(ll p,ll q){return q==0?p:gcd(q,p%q);}
ll qpow(ll p,ll q){ll f=1;while(q){if(q&1)f=f*p;p=p*p;q>>=1;}return f;}
int n,m,k,t,h[maxn],tot,vis[maxn],s,cur[maxn];
bool flag;
set<int>ans;
struct node
{
    int to,nxt,cap,flow;
}e[20000<<1];
void add(int x,int y,int z)
{
    e[tot].to=y;
    e[tot].nxt=h[x];
    e[tot].cap=z;
    h[x]=tot++;
    e[tot].to=x;
    e[tot].nxt=h[y];
    h[y]=tot++;
}
bool bfs()
{
    memset(vis,0,sizeof vis);
    queue<int>p;
    p.push(s);
    vis[s]=1;
    if(flag)ans.insert(s);
    while(!p.empty())
    {
        int x=p.front();p.pop();
        for(int i=h[x];i!=-1;i=e[i].nxt)
        {
            int to=e[i].to,cap=e[i].cap,flow=e[i].flow;
            if(!vis[to]&&cap>flow)
            {
                vis[to]=vis[x]+1;
                p.push(to);
                if(flag)ans.insert(to);
            }
        }
    }
    return vis[t];
}
int dfs(int x,int a)
{
    if(x==t||a==0)return a;
    int ans=0,j;
    for(int&i=cur[x];i!=-1;i=e[i].nxt)
    {
        int to=e[i].to,cap=e[i].cap,flow=e[i].flow;
        if(vis[to]==vis[x]+1&&(j=dfs(to,min(a,cap-flow)))>0)
        {
            e[i].flow+=j;
            e[i^1].flow-=j;
            ans+=j;
            a-=j;
            if(a==0)break;
        }
    }
    return ans;
}
int max_flow(int s,int t)
{
    int flow=0,i;
    while(bfs())
    {
        rep(i,1,n)cur[i]=h[i];
        flow+=dfs(s,inf);
    }
    return flow;
}
int main()
{
    int i,j;
    memset(h,-1,sizeof h);
    scanf("%d%d",&n,&m);
    while(m--)
    {
        int a,b,c;
        scanf("%d%d%d",&a,&b,&c);
        add(a,b,c);
    }
    s=1,t=n;
    printf("%d",max_flow(s,t));
    flag=true;
    bfs();
    printf(" %d\n",ans.size());
    for(int x:ans)printf("%d ",x);
    printf("\n");
    //system("Pause");
    return 0;
}