static void reverse ( int [ ] arr , int i , int j ) {
  int temp ;
  while ( i < j ) {
    temp = arr [ i ] ;
    arr [ i ] = arr [ j ] ;
    arr [ j ] = temp ;
    i ++ ;
    j -- ;
  }
}

static void reverse ( int [ ] arr , int i , int j ) { int temp ; while ( i < j ) { temp = arr [ i ] ; arr [ i ] = arr [ j ] ; arr [ j ] = temp ; i ++ ; j -- ; } }
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