Wrong Answer
/in/foo.cc: In function 'int main()':
/in/foo.cc:36:20: warning: unused variable 'k' [-Wunused-variable]
int left,right,k;
^
/in/foo.cc: In function 'int main()':
/in/foo.cc:36:20: warning: unused variable 'k' [-Wunused-variable]
int left,right,k;
^
