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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。


"""
1. Write a function to add the two binary number strings.
e.g.
add('100', '10') -> '110'


2. Follow up, add two number strings with specific base
add('100', '10', 2) -> '110'
add('100', '9', 10) -> '109'. From 1point 3acres bbs


3. Follow up, sum list number strings with specific base. 鍥磋鎴戜滑@1point 3 acres
add_strs(['9', '3', '2'], 10) -> '14'
"""


面试小哥很热情,人很好。
. 1point3acres.com/bbs
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.-google 1point3acres
  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'
  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'. From 1point 3acres bbs
  10. """. more info on 1point3acres.com


  11. def add_str_1(a, b):
  12.     alist = [int(x) for x in a[::-1]]
  13.     blist = [int(x) for x in b[::-1]]
  14.     len_a = len(alist)
  15.     len_b = len(blist) 鏉ユ簮涓浜.涓夊垎鍦拌鍧.
  16.     carry = 0
  17.     i = 0. 鐗涗汉浜戦泦,涓浜╀笁鍒嗗湴
  18.     res = []
  19.     while i < len_a or i < len_b or carry != 0:
  20.         tmp = carry
  21.         if i < len_a:
  22.             tmp += alist[i]
  23.         if i < len_b:
  24.             tmp += blist[i]

  25.         if tmp == 3:
  26.             carry = 1
  27.             tmp = 1
  28.         elif tmp == 2:
  29.             carry = 1
  30.             tmp = 0
  31.         else:
  32.             carry = 0
  33.         res.append(tmp)
  34.         i += 1
  35. . 鐗涗汉浜戦泦,涓浜╀笁鍒嗗湴
  36.     return ''.join([str(x) for x in res[::-1]])


  37. def add_str_2(a, b, base):
  38.     """
  39.     2. Follow up, add two number strings with specific base
  40.     add('100', '10', 2) -> '110'
  41.     add('100', '9', 10) -> '109'. visit 1point3acres.com for more.
  42.     """
  43. . more info on 1point3acres.com
  44.     alist = [int(x) for x in a[::-1]]
  45.     blist = [int(x) for x in b[::-1]]
  46.     len_a = len(alist)
    .鏈枃鍘熷垱鑷1point3acres璁哄潧
  47.     len_b = len(blist)
  48.     carry = 0
  49.     i = 0
  50.     res = []
  51.     while i < len_a or i < len_b or carry != 0:
  52.         tmp = carry
  53.         if i < len_a:
  54.             tmp += alist[i]
  55.         if i < len_b:
  56.             tmp += blist[i]. 1point 3acres 璁哄潧
  57. . 鐗涗汉浜戦泦,涓浜╀笁鍒嗗湴
  58.         carry = tmp / base
  59.         tmp = tmp % base

  60.         res.append(tmp)
  61.         i += 1

  62.     return ''.join([str(x) for x in res[::-1]])


  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 0.1point3acres缃

  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


Unit Test 测试用例如下:
  1. import unittest.鐣欏璁哄潧-涓浜-涓夊垎鍦
  2. from solution import add_str_1. visit 1point3acres.com for more.
  3. from solution import add_str_2
  4. from solution import add_str_3.鐣欏璁哄潧-涓浜-涓夊垎鍦


  5. class Test(unittest.TestCase):

  6.     def test_add_str_1(self):
  7.         a = '110'
  8.         b = '110'.鐣欏璁哄潧-涓浜-涓夊垎鍦
  9.         res = add_str_1(a, b)
    鏉ユ簮涓浜.涓夊垎鍦拌鍧.
  10.         self.assertEqual('1100', res).1point3acres缃
  11. .1point3acres缃
  12.     def test_add_str_2_1(self):
  13.         a = '110'
  14.         b = '110'
  15.         base = 2
  16.         res = add_str_2(a, b, base)
  17.         self.assertEqual('1100', res)

  18.     def test_add_str_2_2(self):
  19.         a = '999'. more info on 1point3acres.com
  20.         b = '1'
  21.         base = 10
  22.         res = add_str_2(a, b, base)
  23.         self.assertEqual('1000', res)

  24.     def test_add_str_2_3(self):. Waral 鍗氬鏈夋洿澶氭枃绔,
  25.         a = '7'
  26.         b = '2'
  27.         base = 8
  28.         res = add_str_2(a, b, base)
  29.         self.assertEqual('11', res)
  30. . visit 1point3acres.com for more.
  31.     def test_add_str_3_1(self):
  32.         input_list = ['9', '4', '3']
  33.         base = 10
  34.         res = add_str_3(input_list, base)
  35.         self.assertEqual('16', res)

  36. if __name__ == '__main__':
  37.     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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