static int count ( int arr [ ] , int low , int high , int x ) {
  if ( ( low > high ) || ( low == high && arr [ low ] != x ) ) return 0 ;
  if ( low == high && arr [ low ] == x ) return 1 ;
  return count ( arr , low , ( low + high ) / 2 , x ) + count ( arr , 1 + ( low + high ) / 2 , high , x ) ;
}

static int count ( int arr [ ] , int low , int high , int x ) { if ( ( low > high ) || ( low == high && arr [ low ] != x ) ) return 0 ; if ( low == high && arr [ low ] == x ) return 1 ; return count ( arr , low , ( low + high ) / 2 , x ) + count ( arr , 1 + ( low + high ) / 2 , high , x ) ; }
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