day24打卡
思路:画出决策树,暴力枚举。子集问题
决策树: 函数头:void dfs(int n, int k, int pos)
函数体:
出口:全局变量count k 保存结果到全局变量ret中
子问题:从pos位置向后变…
一、背景
c包装类
二、运行代码 // A C wrapper class is a class that manages a resource. A resource
// could be memory, file sockets, or a network connection. Wrapper classes
// often use the RAII (Resource Acquisition is Initialization) C
// programming…