/in/foo.cc: In function 'void fang(int, int, int, int)':
/in/foo.cc:11:9: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
  else if(r!=1&&c!=n)if(!a[c+1][r-1]){rr=r-1;cc=c+1;}
         ^
/in/foo.cc:13:11: warning: 'cc' may be used uninitialized in this function [-Wmaybe-uninitialized]
  a[cc][rr]=cur;
  ~~~~~~~~~^~~~
/in/foo.cc:13:11: warning: 'rr' may be used uninitialized in this function [-Wmaybe-uninitialized]