回溯（b a c k t r a c k i n g）是一種系統(tǒng)地搜索問題解答的方法。為了實現(xiàn)回溯，首先需要為問題定義一個解空間（ solution space），這個空間必須至少包含問題的一個解（可能是最優(yōu)的）。在迷宮老鼠問題中，我們可以定義一個包含從入口到出口的所有路徑的解空間；在具有n 個對象的0 / 1背包問題中（見1 . 4節(jié)和2 . 2節(jié)），解空間的一個合理選擇是2n 個長度為n 的0 / 1向量的集合，這個集合表示了將0或1分配給x的所有可能方法。當(dāng)n= 3時，解空間為{ ( 0 , 0 , 0 )，( 0 , 1 , 0 )，( 0 , 0 , 1 )，( 1 , 0 , 0 )，( 0 , 1 , 1 )，( 1 , 0 , 1 )，( 1 , 1 , 0 )，( 1 , 1 , 1 ) }。
標(biāo)簽： 搜索
上傳時間： 2014-01-17
上傳用戶：jhksyghr
convert numbers from h to d or b to h
標(biāo)簽： convert numbers from to
上傳時間： 2014-11-17
上傳用戶：refent
bool 運算(a)OR(b)二進制十進制顯示
上傳時間： 2014-01-24
上傳用戶：思琦琦
~{JGR 8vQ IzWwR5SC5D2V?bD#DbO5M3~} ~{3v?b~} ~{Hk?b~} ~{2iQ/5H9&D\~} ~{?IRTWw@)3d~} ~{TZ~}JDK1.4.2~{OBM(9}~}
上傳時間： 2015-02-22
上傳用戶：ommshaggar
b to b 模式 電子商務(wù)系統(tǒng) ，c# 開發(fā) , B/S結(jié)構(gòu)
標(biāo)簽： to 模式 電子商務(wù)系統(tǒng)
上傳時間： 2014-01-20
上傳用戶：hanli8870
樣板 B 樹 ( B - tree ) 規(guī)則 : (1) 每個節(jié)點內(nèi)元素個數(shù)在 [MIN,2*MIN] 之間, 但根節(jié)點元素個數(shù)為 [1,2*MIN] (2) 節(jié)點內(nèi)元素由小排到大, 元素不重複 (3) 每個節(jié)點內(nèi)的指標(biāo)個數(shù)為元素個數(shù)加一 (4) 第 i 個指標(biāo)所指向的子節(jié)點內(nèi)的所有元素值皆小於父節(jié)點的第 i 個元素 (5) B 樹內(nèi)的所有末端節(jié)點深度一樣
上傳時間： 2017-05-14
上傳用戶：日光微瀾
歐幾里德算法：輾轉(zhuǎn)求余 原理: gcd(a,b)=gcd(b,a mod b) 當(dāng)b為0時,兩數(shù)的最大公約數(shù)即為a getchar()會接受前一個scanf的回車符
標(biāo)簽： gcd getchar scanf mod
上傳時間： 2014-01-10
上傳用戶：2467478207
數(shù)據(jù)結(jié)構(gòu)課程設(shè)計 數(shù)據(jù)結(jié)構(gòu)B+樹 B+ tree Library
標(biāo)簽： Library tree 數(shù)據(jù)結(jié)構(gòu) 樹
上傳時間： 2013-12-31
上傳用戶：semi1981
We have a group of N items (represented by integers from 1 to N), and we know that there is some total order defined for these items. You may assume that no two elements will be equal (for all a, b: a<b or b<a). However, it is expensive to compare two items. Your task is to make a number of comparisons, and then output the sorted order. The cost of determining if a < b is given by the bth integer of element a of costs (space delimited), which is the same as the ath integer of element b. Naturally, you will be judged on the total cost of the comparisons you make before outputting the sorted order. If your order is incorrect, you will receive a 0. Otherwise, your score will be opt/cost, where opt is the best cost anyone has achieved and cost is the total cost of the comparisons you make (so your score for a test case will be between 0 and 1). Your score for the problem will simply be the sum of your scores for the individual test cases.
標(biāo)簽： represented integers group items
上傳時間： 2016-01-17
上傳用戶：jeffery
The government of a small but important country has decided that the alphabet needs to be streamlined and reordered. Uppercase letters will be eliminated. They will issue a royal decree in the form of a String of B and A characters. The first character in the decree specifies whether a must come ( B )Before b in the new alphabet or ( A )After b . The second character determines the relative placement of b and c , etc. So, for example, "BAA" means that a must come Before b , b must come After c , and c must come After d . Any letters beyond these requirements are to be excluded, so if the decree specifies k comparisons then the new alphabet will contain the first k+1 lowercase letters of the current alphabet. Create a class Alphabet that contains the method choices that takes the decree as input and returns the number of possible new alphabets that conform to the decree. If more than 1,000,000,000 are possible, return -1. Definition
標(biāo)簽： government streamline important alphabet
上傳時間： 2015-06-09
上傳用戶：weixiao99
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