/in/foo.cc: In function 'int Search(Node*)':
/in/foo.cc:33:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:36:8: warning: unused variable 'x' [-Wunused-variable]
  int n,x,m,b[100010],a[100010];
        ^