回答編集履歴
1
追記
test
CHANGED
|
@@ -61,3 +61,57 @@
|
|
|
61
61
|
}
|
|
62
62
|
|
|
63
63
|
```
|
|
64
|
+
|
|
65
|
+
|
|
66
|
+
|
|
67
|
+
----
|
|
68
|
+
|
|
69
|
+
|
|
70
|
+
|
|
71
|
+
あるいは無駄に配列関数を駆使してみたり
|
|
72
|
+
|
|
73
|
+
|
|
74
|
+
|
|
75
|
+
```lang-php
|
|
76
|
+
|
|
77
|
+
<?php
|
|
78
|
+
|
|
79
|
+
$prime_list = [3, 5, 7, 11, 13, 17, 19, 23, 29, 31];
|
|
80
|
+
|
|
81
|
+
$result = [];
|
|
82
|
+
|
|
83
|
+
$max = 1 << count($prime_list);
|
|
84
|
+
|
|
85
|
+
|
|
86
|
+
|
|
87
|
+
for ($i=0; $i<$max; $i++) {
|
|
88
|
+
|
|
89
|
+
$arr = array_filter(array_map(
|
|
90
|
+
|
|
91
|
+
function ($a, $b) { return $a * $b; },
|
|
92
|
+
|
|
93
|
+
$prime_list,
|
|
94
|
+
|
|
95
|
+
preg_split("//", strrev(sprintf("%b", $i)), -1, PREG_SPLIT_NO_EMPTY)
|
|
96
|
+
|
|
97
|
+
));
|
|
98
|
+
|
|
99
|
+
if (count($arr) > 1) {
|
|
100
|
+
|
|
101
|
+
$result[] = [array_product($arr), count($arr), implode("*", $arr)];
|
|
102
|
+
|
|
103
|
+
}
|
|
104
|
+
|
|
105
|
+
}
|
|
106
|
+
|
|
107
|
+
|
|
108
|
+
|
|
109
|
+
foreach ($result as list ($val, $cnt, $expr)) {
|
|
110
|
+
|
|
111
|
+
echo "$expr = $val ... ($cnt)\n";
|
|
112
|
+
|
|
113
|
+
}
|
|
114
|
+
|
|
115
|
+
```
|
|
116
|
+
|
|
117
|
+
|