详细代码下载,参见:http://download.csdn.net/source/1632402
先说说我的思路,以四个整数计算24为例,这4个数存放在arr中,分别为arr[0]~arr[3]:首先是4个数的顺序组合,应该是有以下24种:arr[0],arr[1],arr[2],arr[3]arr[0],arr[1],arr[3],arr[2]arr[0],arr[3],arr[2],arr[1]arr[0],arr[3],arr[1],arr[2]arr[0],arr[2],arr[3],arr[1]arr[0],arr[2],arr[1],arr[3]
arr[1],arr[0],arr[2],arr[3]arr[1],arr[0],arr[3],arr[2]arr[1],arr[3],arr[2],arr[0]arr[1],arr[3],arr[0],arr[2]arr[1],arr[2],arr[3],arr[0]arr[1],arr[2],a......
阅读全文