LoKwongho

摘要： 八皇后问题：规则是皇后不能处于对角线，切皇后不能挨着递归回溯法 求八皇后问题解的个数 1 #include 2 #include 3 using namespace std; 4 const int maxn = 1003; 5 6 int n,sum = 0; 7 vector a; 8 9 bool isValid(int k,int i){ 10 bool ... 阅读全文

摘要： Recommendation system predicts the preference that a user would give to an item. Now you are asked to program a very simple recommendation system that 阅读全文