#include
#include
using?namespace?std;

int?main（）
{
????int?abcd;
????ifstream?in;
????in.open（“file.txt“）;
????in>>a>>b;
????int?array[a][a];
????int?ijk;
????for（i=0;i????{
????????for（j=0;j????????{
????????????array[i][j]=0;
????????}
????}
????for（i=0;i????{
????????array[i][i]=1;
????}//初始化數組自己和自己全部認識
????for（i=0;i????{
????????in>>c>>d;array[c-1][d-1]=1;array[d-1][c-1]=1;