倒數三天強度不升級下怎行呢
Codewars LV4
打算一氣呵成寫完，結果後面卡住 (暈
正確解法明天補上~
題目(Next bigger number with the same digits)：
1
2
3
4
5
6
7
8
9
10You have to create a function that takes a positive integer number and returns the next bigger number formed by the same digits:
12 ==> 21
513 ==> 531
2017 ==> 2071
If no bigger number can be composed using those digits, return -1:
9 ==> -1
111 ==> -1
531 ==> -1
1
2
3
4
5
6
7
8
9def next_bigger(n)
#your code here
end
Test.assert_equals(next_bigger(12),21)
Test.assert_equals(next_bigger(513),531)
Test.assert_equals(next_bigger(2017),2071)
Test.assert_equals(next_bigger(414),441)
Test.assert_equals(next_bigger(144),414)
影片解題：
答案：
1
2
3
4
5
6# Next bigger number with the same digits
def next_bigger(n)
n.to_s.split('').permutation(n.to_s.length).map(&:join).select{ |x| return x.to_i if x.to_i > n }
-1
end
#非正確答案喔!!
下集待續..
本文同步發布於 小菜的 Blog https://riverye.com/