计算a,b,c的排列组合

Posted 2022-07-11 zhuyapeng

递归实现，思路的确有点难得想：

        public void SortAll(List<string> list,int start,int end)
        
            if (start==end)
            
                foreach (var item in list)
                
                    Console.Write(item);
                
                Console.WriteLine();
            
            else
            
                for (int i = start; i < end; i++)
                
                    //交换变量
                    var temp = list[start];
                    list[start] = list[i];
                    list[i] = temp;
                    //递归排序
                    SortAll(list,start+1,end);
                    //还原变量
                    temp = list[start];
                    list[start] = list[i];
                    list[i] = temp;