static int minMoves ( int n , int a [ ] , int k ) {
  int ct1 [ ] = new int [ k ] ;
  int ct0 [ ] = new int [ k ] ;
  int moves = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) if ( a [ i ] == 1 ) ct1 [ i % k ] ++ ;
  else ct0 [ i % k ] ++ ;
  for ( int i = 0 ;
  i < k ;
  i ++ ) moves += Math . min ( ct1 [ i ] , ct0 [ i ] ) ;
  return moves ;
}

static int minMoves ( int n , int a [ ] , int k ) { int ct1 [ ] = new int [ k ] ; int ct0 [ ] = new int [ k ] ; int moves = 0 ; for ( int i = 0 ; i < n ; i ++ ) if ( a [ i ] == 1 ) ct1 [ i % k ] ++ ; else ct0 [ i % k ] ++ ; for ( int i = 0 ; i < k ; i ++ ) moves += Math . min ( ct1 [ i ] , ct0 [ i ] ) ; return moves ; }
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