# 1. How to construct a graph-----adjacency matrix

Source: Internet
Author: User

`#include <iostream>using namespacestd;#defineunvistited 0//indicates that it has not been visited#defineVisited 1//indicates that it has been visited//Graph ClassclassGraph {Private:    intNumvertex, Numedge;//Number of points and number of edges    int**matrix;//adjacency Matrix    int*Mark; Public:    //constructor FunctionGraph (intNumvert)    {Init (Numvert); }    // Destructors~Graph () {Delete[]mark;  for(inti =0; i < Numvertex; i++) {            Delete[]matrix[i]; }        Delete[]matrix; }    //Initialize    voidInit (intN) {inti; Numvertex=N; Numedge=0; Mark=New int[Numvertex]; Matrix=New int*[Numvertex];  for(i =0; i < Numvertex; i++) {Mark[i]=unvistited; }         for(i =0; i < Numvertex; i++) {Matrix[i]=New int[Numvertex]; }         for(i =0; i < Numvertex; i++) {             for(intj =0; J < Numvertex; J + +) {Matrix[i][j]=0; }        }    }    //number of return points    intN () {returnNumvertex;} //returns the number of edges    intE () {returnNumedge;} //returns the first neighbor of a point v    intFirstintv) {         for(inti =0; I < n (); i++) {            if(Matrix[v][i]! =0) {                returni; }        }        return-1; }    //returns the first neighbor after W    intNextintVintW) { for(inti = w +1; I < n (); i++) {            if(Matrix[v][i]! =0) {                returni; }        }        return-1; }    //Set V1 to V2 with an edge, assign WT    voidSetedge (intV1,intV2,intwt) {        if(Matrix[v1][v2] = =0) {Matrix[v1][v2]=wt; Numedge++; }    }    //Remove the edge between V1 and v2    voidDeleteedge (intV1,intv2) {        if(Matrix[v1][v2] = =1) {Matrix[v1][v2]=0; Numedge--; }    }};intmain () {}`

1. How to construct a graph-----adjacency matrix

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