回溯(b a c k t r a c k i n g)是一種系統(tǒng)地搜索問(wèn)題解答的方法。為了實(shí)現(xiàn)回溯,首先需要為問(wèn)題定義一個(gè)解空間( solution space),這個(gè)空間必須至少包含問(wèn)題的一個(gè)解(可能是最優(yōu)的)。在迷宮老鼠問(wèn)題中,我們可以定義一個(gè)包含從入口到出口的所有路徑的解空間;在具有n 個(gè)對(duì)象的0 / 1背包問(wèn)題中(見(jiàn)1 . 4節(jié)和2 . 2節(jié)),解空間的一個(gè)合理選擇是2n 個(gè)長(zhǎng)度為n 的0 / 1向量的集合,這個(gè)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(shí),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(shí)間: 2014-01-17
上傳用戶(hù):jhksyghr
~{JGR 8vQ IzWwR5SC5D2V?bD#DbO5M3~} ~{3v?b~} ~{Hk?b~} ~{2iQ/5H9&D\~} ~{?IRTWw@)3d~} ~{TZ~}JDK1.4.2~{OBM(9}~}
上傳時(shí)間: 2015-02-22
上傳用戶(hù):ommshaggar
when detect the bit meet, then set th bit in bit map
標(biāo)簽: bit detect when meet
上傳時(shí)間: 2014-01-04
上傳用戶(hù):shus521
b to b 模式 電子商務(wù)系統(tǒng) ,c# 開(kāi)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(shí)間: 2014-01-20
上傳用戶(hù):hanli8870
a XOR b> a,然后a XOR b< b,and both a and b are dependent data
標(biāo)簽: XOR and dependent both
上傳時(shí)間: 2014-01-27
上傳用戶(hù):yxgi5
z-trenning z-tickets. mipt lucky tickets. Count of numbers with 2*n digits in base k such that sum of first n digits is same as second n digits.
標(biāo)簽: z-trenning z-tickets tickets numbers
上傳時(shí)間: 2014-01-05
上傳用戶(hù):luopoguixiong
樣板 B 樹(shù) ( B - tree ) 規(guī)則 : (1) 每個(gè)節(jié)點(diǎn)內(nèi)元素個(gè)數(shù)在 [MIN,2*MIN] 之間, 但根節(jié)點(diǎn)元素個(gè)數(shù)為 [1,2*MIN] (2) 節(jié)點(diǎn)內(nèi)元素由小排到大, 元素不重複 (3) 每個(gè)節(jié)點(diǎn)內(nèi)的指標(biāo)個(gè)數(shù)為元素個(gè)數(shù)加一 (4) 第 i 個(gè)指標(biāo)所指向的子節(jié)點(diǎn)內(nèi)的所有元素值皆小於父節(jié)點(diǎn)的第 i 個(gè)元素 (5) B 樹(shù)內(nèi)的所有末端節(jié)點(diǎn)深度一樣
上傳時(shí)間: 2017-05-14
上傳用戶(hù):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(shí),兩數(shù)的最大公約數(shù)即為a getchar()會(huì)接受前一個(gè)scanf的回車(chē)符
標(biāo)簽: gcd getchar scanf mod
上傳時(shí)間: 2014-01-10
上傳用戶(hù):2467478207
數(shù)據(jù)結(jié)構(gòu)課程設(shè)計(jì) 數(shù)據(jù)結(jié)構(gòu)B+樹(shù) B+ tree Library
標(biāo)簽: Library tree 數(shù)據(jù)結(jié)構(gòu) 樹(shù)
上傳時(shí)間: 2013-12-31
上傳用戶(hù):semi1981
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(shí)間: 2015-06-09
上傳用戶(hù):weixiao99
蟲(chóng)蟲(chóng)下載站版權(quán)所有 京ICP備2021023401號(hào)-1