最短路径--优先队列式分支界限法

 #include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

const int INT_MAX = 10000;
const int n = 10;
int graph[n+1][n+1] = {0};
int dist[n+1] = {0};
int pre[n+1] = {0};

typedef struct Node {
        int vertex;
        int length;
}Node;

void initParament()
{
}

bool compare(Node first, Node second)
{
        return first.length < second.length;
}

void shortestPath()
{
        vector<Node> heap;
        Node current;
        current.vertex = 1;
        current.length = 0;
        while(true){
                for(int i=1; i<=n; i++){
                        if(graph[i][current.vertex]<INT_MAX && graph[i][current.vertex]+current.length<dist[i]){
                                Node new_node;
                                new_node.vertex = i;
                                new_node.length = graph[i][current.vertex]+current.length;
                                heap.push_back(new_node);
                                push_heap(heap.begin(), heap.end(), compare);

                                dist[i] = graph[i][current.vertex]+current.length;
                                pre[i] = current.vertex;
                        }
                }
                if( heap.empty() ){
                        break;
                }
                pop_heap(heap.begin(), heap.end(), compare);
                current = *heap.rbegin();
                heap.erase(heap.end()-1);
        }
}

int main()
{
        initParament();
        shortestPath();
        for(int i=1; i<=n; i++){
                cout << dist[i] << “/t”;
        }
        cout << endl;

        return 0;
}

    原文作者:分支限界法
    原文地址: https://blog.csdn.net/hongshundi/article/details/4653497
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