/in/foo.cc: In function 'void Print()':
/in/foo.cc:24:10: warning: unused variable 'k' [-Wunused-variable]
  int i,j,k;
          ^
/in/foo.cc: In function 'int Judge()':
/in/foo.cc:48:18: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   V[i][j]=M[i][j]=0;
           ~~~~~~~^~
/in/foo.cc:30:10: warning: unused variable 'k' [-Wunused-variable]
  int i,j,k,cnt=0;
          ^
/in/foo.cc: In function 'void DFS(int, int)':
/in/foo.cc:78:11: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
    while(r=Judge()) s+=r;
          ~^~~~~~~~
/in/foo.cc:91:11: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
    while(r=Judge()) s+=r;
          ~^~~~~~~~
/in/foo.cc:53:10: warning: unused variable 'k' [-Wunused-variable]
  int i,j,k,u,v,r,s;
          ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:105:16: warning: unused variable 'k' [-Wunused-variable]
  S=G();int i,j,k,cnt=0;
                ^