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2014-04-14 Yelp skype面试

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johnnywsd 发表于 2014-4-15 06:50:22 | 显示全部楼层 |阅读模式

2014(1-3月) 码农类 硕士 全职@Yelp - 网上海投 - 技术电面 |Other

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技术问题如下。


""". visit 1point3acres.com for more.
1. Write a function to add the two binary number strings.
e.g.. 鍥磋鎴戜滑@1point 3 acres
add('100', '10') -> '110'


2. Follow up, add two number strings with specific base. from: 1point3acres.com/bbs
add('100', '10', 2) -> '110'
add('100', '9', 10) -> '109'
. 1point 3acres 璁哄潧

3. Follow up, sum list number strings with specific base. 鐗涗汉浜戦泦,涓浜╀笁鍒嗗湴
add_strs(['9', '3', '2'], 10) -> '14'
"""


面试小哥很热情,人很好。. more info on 1point3acres.com

我全部拿Python写的代码。代码如下:
  1. """
  2. 1. Write a function to add the two binary number strings.
  3. e.g.
  4. add('100', '10') -> '110'

  5. 2. Follow up, add two number strings with specific base
  6. add('100', '10', 2) -> '110'. 鐣欏鐢宠璁哄潧-涓浜╀笁鍒嗗湴
  7. add('100', '9', 10) -> '109'

  8. 3. Follow up, sum list number strings with specific base
  9. add_strs(['9', '3', '2'], 10) -> '14'. 鐗涗汉浜戦泦,涓浜╀笁鍒嗗湴
  10. """
  11. 鏉ユ簮涓浜.涓夊垎鍦拌鍧.
  12. . From 1point 3acres bbs
  13. def add_str_1(a, b):
  14.     alist = [int(x) for x in a[::-1]]
  15.     blist = [int(x) for x in b[::-1]]
  16.     len_a = len(alist)
  17.     len_b = len(blist)
  18.     carry = 0
  19.     i = 0. 鍥磋鎴戜滑@1point 3 acres
  20.     res = []
  21.     while i < len_a or i < len_b or carry != 0:
  22.         tmp = carry. visit 1point3acres.com for more.
  23.         if i < len_a:
  24.             tmp += alist[i]
  25.         if i < len_b:
  26.             tmp += blist[i]

  27.         if tmp == 3:
  28.             carry = 1
  29.             tmp = 1
  30.         elif tmp == 2:
  31.             carry = 1
    . 鐗涗汉浜戦泦,涓浜╀笁鍒嗗湴
  32.             tmp = 0
  33.         else:
  34.             carry = 0
  35.         res.append(tmp).1point3acres缃
  36.         i += 1

  37.     return ''.join([str(x) for x in res[::-1]]). Waral 鍗氬鏈夋洿澶氭枃绔,


  38. def add_str_2(a, b, base):
  39.     """
  40.     2. Follow up, add two number strings with specific base
  41.     add('100', '10', 2) -> '110'. From 1point 3acres bbs
  42.     add('100', '9', 10) -> '109'.1point3acres缃
  43.     """

  44.     alist = [int(x) for x in a[::-1]]
  45.     blist = [int(x) for x in b[::-1]]
  46.     len_a = len(alist)
  47.     len_b = len(blist)
  48.     carry = 0. from: 1point3acres.com/bbs
  49.     i = 0
  50.     res = []
  51.     while i < len_a or i < len_b or carry != 0:
  52.         tmp = carry.鏈枃鍘熷垱鑷1point3acres璁哄潧
  53.         if i < len_a:
  54.             tmp += alist[i]
  55.         if i < len_b:
  56.             tmp += blist[i]

  57.         carry = tmp / base
  58.         tmp = tmp % base

  59.         res.append(tmp). 1point 3acres 璁哄潧
  60.         i += 1

  61.     return ''.join([str(x) for x in res[::-1]])
  62. . From 1point 3acres bbs

  63. def add_str_3(input_list, base):
  64.     """
  65.     3. Follow up, sum list number strings with specific base
  66.     add_strs(['9', '3', '2'], 10) -> '14'
  67.     """
  68.     if not input_list:
  69.         return 0

  70.     while len(input_list) >= 2:
  71.         a = input_list.pop()
  72.         b = input_list.pop()
  73.         tmp = add_str_2(a, b, base)
  74.         input_list.append(tmp)

  75.     return input_list[0]
复制代码
. Waral 鍗氬鏈夋洿澶氭枃绔,

Unit Test 测试用例如下:
  1. import unittest
  2. from solution import add_str_1
  3. from solution import add_str_2. visit 1point3acres.com for more.
  4. from solution import add_str_3


  5. class Test(unittest.TestCase): 鏉ユ簮涓浜.涓夊垎鍦拌鍧.

  6.     def test_add_str_1(self):. visit 1point3acres.com for more.
  7.         a = '110'
  8.         b = '110'
  9.         res = add_str_1(a, b)
  10.         self.assertEqual('1100', res)

  11.     def test_add_str_2_1(self):
  12.         a = '110'
  13.         b = '110'.鐣欏璁哄潧-涓浜-涓夊垎鍦
  14.         base = 2
  15.         res = add_str_2(a, b, base)
  16.         self.assertEqual('1100', res)

  17.     def test_add_str_2_2(self):
  18.         a = '999'
  19.         b = '1'
  20.         base = 10
  21.         res = add_str_2(a, b, base)
  22.         self.assertEqual('1000', res)

  23.     def test_add_str_2_3(self):
  24.         a = '7'
  25.         b = '2'
  26.         base = 8
  27.         res = add_str_2(a, b, base)
  28.         self.assertEqual('11', res)

  29.     def test_add_str_3_1(self):
  30.         input_list = ['9', '4', '3']
  31.         base = 10. Waral 鍗氬鏈夋洿澶氭枃绔,
  32.         res = add_str_3(input_list, base). from: 1point3acres.com/bbs
  33.         self.assertEqual('16', res)

  34. if __name__ == '__main__':
  35.     unittest.main(verbosity=2)
复制代码


发题攒人品,求过。

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 楼主| johnnywsd 发表于 2014-11-25 05:16:48 | 显示全部楼层
这个没人回?
lz就是个jb
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