foo.cpp: In function 'int putout()':
foo.cpp:32:12: error: 'ans' was not declared in this scope
     return ans;
            ^
foo.cpp:18:9: warning: unused variable 'root' [-Wunused-variable]
     int root=heap[1];
         ^
foo.cpp:33:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^