/in/foo.cc: In function 'int BinarySearch(int*, int, int)':
/in/foo.cc:5:14: warning: unused variable 'k2' [-Wunused-variable]
     int k1=0,k2,k3,s;
              ^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:36:9: error: 'i' was not declared in this scope
     for(i=0;i<m;i++)
         ^
/in/foo.cc:38:9: error: 'i' was not declared in this scope
     for(i=0;i<m;i++)
         ^