View Compilation Error

0_0_25090500_25619.cpp: In function 'int main()':
0_0_25090500_25619.cpp:26:40: error: 'Rwead' was not declared in this scope
   for (int i=1,x,y; i<=m; i++) x=Rwead(),y=Read(),lnk[x][y]=lnk[y][x]=1;
                                        ^