/in/foo.cc:77:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main() {
      ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:79:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for(;(1<<pp)<=n;pp++); pp--;
     ^~~
/in/foo.cc:79:28: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
     for(;(1<<pp)<=n;pp++); pp--;
                            ^~