这篇文章主要介绍了php通过排列组合实现1到9数字相加都等于20的方法,实例分析了php排列组合数学运算的相关技巧,具有一定参考借鉴价值,需要的朋友可以参考下
本文实例讲述了php通过排列组合实现1到9数字相加都等于20的方法。分享给大家供大家参考。具体实现方法如下:
3+8+9 [1] => 4+7+9
测试效果:1:对于加数数组比较小的,速度可以,过大的话,有些慢;2:每次可以使用不同的加数的,处理会变慢
采用的方法是:生成所有可能排列,对排列处理过滤重复的,,得到组合
*/
function huoqu_zhuhe($eq,$jiashu,$isone=1)
{if(empty($jiashu)||!is_array($jiashu)){echo 'error:加数必须数组';return false;}
$feishu=0;
for($i=0;$i
运行结果如下:
Array ( [0] => 3+8+9 [1] => 4+7+9 [2] => 5+6+9 [3] => 5+7+8 [4] => 1+2+8+9 [5] => 1+3+7+9 [6] => 1+4+6+9 [7] => 1+4+7+8 [8] => 1+5+6+8 [9] => 2+3+6+9 [10] => 2+3+7+8 [11] => 2+4+5+9 [12] => 2+4+6+8 [13] => 2+5+6+7 [14] => 3+4+5+8 [15] => 3+4+6+7 [16] => 1+2+3+5+9 [17] => 1+2+3+6+8 [18] => 1+2+4+5+8 [19] => 1+2+4+6+7 [20] => 1+3+4+5+7 [21] => 2+3+4+5+6 )
希望本文所述对大家的php程序设计有所帮助。

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