/in/foo.cc: In function 'void Infix(int&, int, int, int, int)':
/in/foo.cc:30:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  if(!v)v=++ind;tree[v].d+=x;if(L==R)return ;
  ^~
/in/foo.cc:30:16: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
  if(!v)v=++ind;tree[v].d+=x;if(L==R)return ;
                ^~~~