Practice_5: Adjacent List Graph

ONLY read data from file; e.g.

 

3 2  //nodes, edges

0 1 9  //from, to, weight

0 2 10

1 0 9

2 0 10

-1 -1 -1 //end line

 

 

MISS class List;  

ONLY realize adjacent list;

Some data is redundent;

 

Just practice; fight on !! 

class EdgeNode{ //edge nodepublic:int keyVal;int weight;EdgeNode* next;EdgeNode(int value, int wVal = 1) { next = NULL; weight = wVal; keyVal = value; }static void ShowNodeKey(int ptr) { printf("%d ", ((EdgeNode*)ptr)->keyVal); }static void ShowNodeWeight(int ptr) { printf("%d ", ((EdgeNode*)ptr)->weight); }};class VertexNode{ // the vertex node i.e. the head of listpublic:int keyVal;List* head;VertexNode(void) { head = new List; keyVal = -1; }};class MatrixNode{ //for Matrix nodepublic:int from;int to;int weight;MatrixNode(int fVal = -1, int tVal = -1, int wVal = 1) { from = fVal; to= tVal; weight = wVal; }};class Graph{protected:VertexNode* adjList;int nodes; int edges; MatrixNode** adjMatrix;int type; //the structure of record; adjList = 0; adjMatrix = 1; default: adjListint direction; //non-directed 0, directed 1; default: non-directedpublic:Graph(char* fileName, int t = 0, int d = 0); //get data from file or manual input~Graph();}; 

 

Graph::Graph(char* fileName, int t, int d){int from, to, weight;type = t; //record typedirection = d;void* element;if(fileName){FILE* pFile = fopen(fileName, "r"); //无向图，必须添加两个方向的信息fscanf(pFile,"%d %d",&nodes,&edges);if(!type){adjList = new VertexNode[nodes];adjMatrix = NULL;for(int i=0; i<nodes; i++){adjList[i].keyVal = i; //create indexing number, from 0}while(fscanf(pFile,"%d %d %d",&from,&to,&weight)){if(from >= 0 && to >= 0){element = (void*)(new EdgeNode(to,weight));adjList[from].head->Prepend(element,to);}elsebreak;}}fclose(pFile);}else{cout<<"only support file"<<endl;ASSERT(false);}}Graph::~Graph(){if(!type){for(int i=0;i<nodes;i++){ while(!adjList[i].head->IsEmpty()) delete adjList[i].head->Remove(); //delete EdgeNode type delete adjList[i].head; //delete list type}}delete adjList; //delete adjList array}