/in/foo.cc: In function 'int main()':
/in/foo.cc:48:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(int i=1;i<=n;i++)
  ^~~
/in/foo.cc:50:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   build(1,n,1);
   ^~~~~