foo.cpp:1:3: error: stray '#' in program
 ji#include <iostream>
   ^
foo.cpp:1:1: error: 'ji' does not name a type
 ji#include <iostream>
 ^~
foo.cpp: In function 'int push(int, long long int)':
foo.cpp:16:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^