Pagini recente » Cod sursa (job #471566) | Cod sursa (job #2670532) | Cod sursa (job #800056) | Cod sursa (job #1111921) | Cod sursa (job #1444249)
#include <fstream>
#include <queue>
#include <vector>
#include <climits>
#include <iostream>
using namespace std;
const int maxN = 1001;
bool BFS(int src, int N, vector<int> adjList[],
int flow[][maxN], int capacity[][maxN], int parent[], bool visited[]);
int main()
{
int N, M, i, x, y ,c;
ifstream f("maxflow.in");
f >> N >> M;
vector<int> adjList[N + 1];
int flow[N + 1][maxN], capacity[N + 1][maxN], parent[N + 1];
bool visited[N + 1];
for (i = 1; i <= N; i++)
{
fill(flow[i] + 1, flow[i] + N + 1, 0);
fill(capacity[i] + 1, capacity[i] + N + 1, 0);
}
for (i = 1; i <= M; i++)
{
f >> x >> y >> c;
adjList[x].push_back(y);
adjList[y].push_back(x);
capacity[x][y] = c;
}
int minFlow, result = 0;
int j, currentNode;
while (BFS(1, N, adjList, flow, capacity, parent, visited))
{
cout << adjList[N].size() << " ";
for (j = 0; j < adjList[N].size(); j++)
{
currentNode = adjList[N][j];
if (flow[currentNode][N] != capacity[currentNode][N] && visited[currentNode])
{
minFlow = INT_MAX;
parent[N] = currentNode;
for (i = N; parent[i] != -1; i = parent[i])
minFlow = min(minFlow, capacity[parent[i]][i] - flow[parent[i]][i]);
if (minFlow)
{
for (i = N; parent[i] != -1; i = parent[i])
{
flow[parent[i]][i] += minFlow;
flow[i][parent[i]] -= minFlow;
}
result += minFlow;
}
}
}
}
ofstream g("maxflow.out");
g << result;
g.close();
return 0;
}
bool BFS(int src, int N, vector<int> adjList[],
int flow[][maxN], int capacity[][maxN], int parent[], bool visited[])
{
fill(visited + 1, visited + N + 1, false);
queue<int> q;
q.push(src);
visited[src] = true;
parent[src] = -1;
int x, i;
while (!q.empty())
{
x = q.front();
q.pop();
if (x != N)
{
for (i = 0; i < adjList[x].size(); i++)
{
int neighbor = adjList[x][i];
if (capacity[x][neighbor] != flow[x][neighbor] && !visited[neighbor])
{
visited[neighbor] = true;
q.push(neighbor);
parent[neighbor] = x;
}
}
}
}
return visited[N];
}