text: Sort first and second halves
code: RearrangePosNeg ( arr , l , m ) ; RearrangePosNeg ( arr , m + 1 , r ) ; merge ( arr , l , m , r ) ; } } static int [ ] swap ( int [ ] arr , int i , int j ) { int temp = arr [ i ] ; arr [ i ] = arr [ j ] ; arr [ j ] = temp ; return arr ; }