摘要:
The set[1,2,3,…,n]contains a total ofn! unique permutations.By listing and labeling all of the permutations in order,We get the following sequence (ie... 阅读全文
摘要:
http://stackoverflow.com/questions/200384/constant-amortized-time分摊常量时间:Amortised time explained in simple terms:If you do an operation say a million ... 阅读全文
摘要:
当所给问题是从n个元素的集合S中找出满足某种性质的子集时,解空间为子集树。例如:0-1背包问题当所给问题是从n个元素的集合S中找出满足某种性质的排列时,解空间为排列树。例如:旅行售货员问题回溯法搜索子集树算法描述为:void backtrack(int t){ if(t>n) output... 阅读全文