/in/foo.cc: In function 'int main()':
/in/foo.cc:77:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for(int i=1;i<=n;i++)
     ^~~
/in/foo.cc:79:2: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
  build(1,1,n);
  ^~~~~