static int waysToArrange ( int N , int K , int [ ] k ) {
  int [ ] [ ] C = new int [ N + 1 ] [ N + 1 ] ;
  int i , j ;
  for ( i = 0 ;
  i <= N ;
  i ++ ) {
    for ( j = 0 ;
    j <= i ;
    j ++ ) {
      if ( j == 0 || j == i ) {
        C [ i ] [ j ] = 1 ;
      }
      else {
        C [ i ] [ j ] = ( C [ i - 1 ] [ j - 1 ] + C [ i - 1 ] [ j ] ) ;
      }
    }
  }
  int [ ] dp = new int [ K + 1 ] ;
  int count = 0 ;
  dp [ 0 ] = 1 ;
  for ( i = 0 ;
  i < K ;
  i ++ ) {
    dp [ i + 1 ] = ( dp [ i ] * C [ count + k [ i ] - 1 ] [ k [ i ] - 1 ] ) ;
    count += k [ i ] ;
  }
  return dp [ K ] ;
}

static int waysToArrange ( int N , int K , int [ ] k ) { int [ ] [ ] C = new int [ N + 1 ] [ N + 1 ] ; int i , j ; for ( i = 0 ; i <= N ; i ++ ) { for ( j = 0 ; j <= i ; j ++ ) { if ( j == 0 || j == i ) { C [ i ] [ j ] = 1 ; } else { C [ i ] [ j ] = ( C [ i - 1 ] [ j - 1 ] + C [ i - 1 ] [ j ] ) ; } } } int [ ] dp = new int [ K + 1 ] ; int count = 0 ; dp [ 0 ] = 1 ; for ( i = 0 ; i < K ; i ++ ) { dp [ i + 1 ] = ( dp [ i ] * C [ count + k [ i ] - 1 ] [ k [ i ] - 1 ] ) ; count += k [ i ] ; } return dp [ K ] ; }
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