Sorting a deck of cards


http://www.timl.id.au/?p=23
第二题是sort a deck of card,要求比nlogn更快,然后想法就是根据花色和大小确定牌应该在的位置,然后swap,比如一张牌suite a,rank b,那么它应该在 a*13+b 的位置上。。。然后lz就傻逼了,换回来的之后直接 i++了。。。应该继续判断是否要交换牌直到该位置的牌正确为止。。。

https://gist.github.com/bookybooky/d79a868a4ce7a891afcc85e6744ffb72
应该可以用桶排序o(n)解决
  1. public class SortDeckOfCard {
  2.         static class Card {
  3.                 int suite;
  4.                 int rank;
  5.                 public Card(int suite, int rank) {
  6.                         this.suite = suite;
  7.                         this.rank = rank;
  8.                 }
  9.         }

  10.         public static void sortDeckOfCard(Card[] cards) {
  11.                 if (cards == null || cards.length == 0) {
  12.                         return;
  13.                 }
  14.                 for (int i = 0; i < cards.length;) {
  15.                         int index = cards[i].suite * 13 + cards[i].rank;
  16.                         if (index >= 0 && index < 52
  17.                                         && (cards[index].suite * 13 + cards[index].rank != index)) {
  18.                                 Card tmp = cards[index];
  19.                                 cards[index] = cards[i];
  20.                                 cards[i] = tmp;
  21.                         } else {
  22.                                 i++;
  23.                         }
  24.                 }
  25.         }

  26.         public static void main(String[] args) {
  27.                 Card[] cards = new Card[52];
  28.                 for (int i = 0; i < 4; i++) {
  29.                         for (int j = 0; j < 13; j++) {
  30.                                 cards[51 - i * 13 - j] = new Card(i, j);
  31.                         }
  32.                 }
  33.                 for (int i = 0; i < 52; i++) {
  34.                         System.out.print((cards[i].suite * 13 + cards[i].rank) + " ");
  35.                 }
  36.                 System.out.println();
  37.                 sortDeckOfCard(cards);
  38.                 for (int i = 0; i < 52; i++) {
  39.                         System.out.print((cards[i].suite * 13 + cards[i].rank) + " ");.
  40.                 }
  41.         }
  42. }


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