Ultraviolet A 10330 Power Transmission

Question: I am too lazy to fight. Lucky Cat contains http: // 163.32.78.26/homework/q10330.htm.

The first network flow question. Each node has a capacity value. Split points are required. Split into I-> I + n edge weights as capacity values

In addition, pay attention to the B-point connection mode: S-Set B

D vertex link mode set D + N-> T Vertex

You can handle other operations.

#include <map>#include <set>#include <list>#include <cmath>#include <ctime>#include <deque>#include <stack>#include <queue>#include <cctype>#include <cstdio>#include <string>#include <vector>#include <climits>#include <cstdlib>#include <cstring>#include <iostream>#include <algorithm>#define LL long long#define PI 3.1415926535897932626using namespace std;int gcd(int a, int b) {return a % b == 0 ? b : gcd(b, a % b);}#define MAXN 250const int INF = 0x3f3f3f3f ;int flow[MAXN][MAXN],c[MAXN][MAXN];int p[MAXN];int N,M,B,D,src,tag;void read(){    memset(c,0,sizeof(c));    src = 0; tag = 2 * N + 1;    for (int i = 1; i <= N; i++)    {        int tmp;        scanf("%d",&tmp);        c[i][i + N] = tmp;    }    scanf("%d",&M);    for (int i = 1; i <= M; i++)    {        int u,v,w;        scanf("%d%d%d",&u,&v,&w);        c[u + N][v] = w;    }    scanf("%d%d",&B,&D);    for (int i = 1; i <= B; i++)    {        int tmp;        scanf("%d",&tmp);        c[0][tmp] = INF;    }    for (int i = 1; i <= D; i++)    {        int tmp;        scanf("%d",&tmp);        c[tmp + N][tag] = INF;    }}int Edmonds_karp(int src,int tag){    memset(flow,0,sizeof(flow));    int ans = 0;    queue<int>q;    while (!q.empty()) q.pop();    int a[MAXN];    while (true)    {        memset(a,0,sizeof(a));        a[src] = INF;        q.push(src);        while (!q.empty())        {            int u = q.front(); q.pop();            for (int v = 0; v <= tag; v++)                if (!a[v] && c[u][v] > flow[u][v])            {                p[v] = u;                q.push(v);                a[v] = min(a[u],c[u][v] - flow[u][v]);            }        }        if (a[tag] == 0) break;        for (int u = tag; u != src; u = p[u])        {            flow[p[u]][u] += a[tag];            flow[u][p[u]] -= a[tag];        }        ans += a[tag];    }    return ans;}int main(){    //freopen("sample.txt","r",stdin);    while (scanf("%d",&N)!=EOF)    {        read();        printf("%d\n",Edmonds_karp(src,tag));    }    return 0;}

 

Ultraviolet A 10330 Power Transmission