Floyd算法(代码)_floyd算法代码

无向图的Floyd算法+有向图的floyd算法
只需修改一行，
dist[u][v]=dist[v][u]= w;
改为
dist[u][v]= w;

代码:

#include<iostream>
using namespace std;
#define Max 9999

int n, m;
int dist[Max][Max];

void Floyd()
{
	for (int i = 0; i < n; ++i)
	{
		for (int j = 0; j < n; ++j)
		{
			for (int p = 0; p < n; ++p)
			{
				if (dist[j][p] > dist[j][i] + dist[i][p])
				{
					dist[j][p] = dist[j][i] + dist[i][p];
				}
			}
		}
	}
	
}

int main()
{
	cout << "输入节点数: ";
	cin >> n;
	cout << "输入边数：";
	cin >> m;
	for (int i = 0; i < n; ++i)//初始化各个数组
	{
		for (int j = 0; j < n; ++j)
		{
			if (j == i)
			{
				dist[i][j] = 0;
			}

			else
			{
				dist[i][j] = Max;
			}
		}
	}
	int u, v, w;
	cout << "输入各条边的信息：" << endl;
	for (int i = 0; i < m; ++i)
	{
		cin >> u >> v >> w;
		dist[u][v] = dist[v][u] = w;
	}

	Floyd();

	for (int i = 0; i < n; ++i)
	{
		for (int j = 0; j < n; ++j)
		{
			cout  << dist[i][j] << " \t";
		}
		cout << endl;
	}

	return 0;
}

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运行结果如下: