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C++翁恺学习12-对象组合
继承是软件重用的一种方式。 组合也是软件重用的一种方式。 reusing the implementation composition(组合):construct new object with existing objectsit is the relationship of "has-a" composition objects can be used to build up other objectsways of inclusion f对象转换小帮手mapstruct
记得第一次看到mapstruct就被它吸引了，简直堪称对象转换神器，原先代码中需要对象之间转换，会使用BeanUtil但是它的性能不高，而且使用局限性也大，遇到不是同名的属性或者属性类型不一样就菜鸡了，遇到这种情况只能自己定义方法实现对象转换，随之而来的是一大堆的get\set简直令人发狂。有【算法】动态规划
描述：代替递归求解 例如：斐波那契函数f(n)=f(n-1)+f(n-2)。计算f(n)需要计算f(n-1)和f(n-2)。当计算f(n-1)时要计算f(n-2)和f(n-3)。因此在计算f(n)中f(n-2)被计算了两次。 为了减少重复的递归调用，我们可以反过来计算。先计算f(2)，有了f(2)再计算f(3)，以此类推，计算到f(n)。在此过程cents上运行wget报错：unable to resolve host address
wget命令报错。无法解析域名"www.keepalived.rog" [vagrant@RS1 download]$ wget http://www.keepalived.org/software/keepalived-1.2.12.tar.gz --2014-05-05 11:06:14-- http://www.keepalived.org/software/keepalived-1.2.12.tar.gz Resolving www.keepalived.orgUVA367 UVALive5251 Let Me Count The Ways【0/1背包】
After making a purchase at a large department store, Mel’s change was 17 cents. He received 1 dime, 1 nickel, and 2 pennies. Later that day, he was shopping at a convenience store. Again his change was 17 cents. This time he received 2 nickels and 7 penni