图的算法--迪杰斯特拉算法

Posted 2021-03-25 yangmenda

#include<iostream>
#include<cstring>
#include<cstdio>
using namespace std;
const int maxn = 100;
int map[maxn][maxn];
int dis[maxn];
int path[maxn];
int vis[maxn]; 
int n;
void DIJ(int s)
{
    memset(path, -1, sizeof(path));
    memset(dis, 0x3f, sizeof(dis));
    memset(vis, 0, sizeof(vis));
    dis[s] = 0;
    while (1)
    {
        int k = 0;
        for (int j = 0; j <= n; ++j)
        {
            if (!vis[j] && dis[j] < dis[k])//找到未被收录且dis值最小的点
            {
                k = j;//变为起点
            }
        }
        if (!k)return;
        vis[k] = 1;
        for (int j = 1; j <= n; ++j)
        {
            if (dis[j] > dis[k] + map[k][j])
            {
                dis[j] = dis[k] + map[k][j];
                path[j] = k;
            }
        }
    }
}
void print(int x)//x为终点
{
    if (x == -1) return;
    //递归
    print(path[x]);
    printf("%d->", x);
}