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2014-04-14 Yelp skype面试

[复制链接] |试试Instant~ |关注本帖
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'

. 涓浜-涓夊垎-鍦帮紝鐙鍙戝竷
3. Follow up, sum list number strings with specific base
add_strs(['9', '3', '2'], 10) -> '14'
"""


面试小哥很热情,人很好。

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'. 1point3acres.com/bbs
  7. add('100', '9', 10) -> '109'
  8. . visit 1point3acres.com for more.
  9. 3. Follow up, sum list number strings with specific base. more info on 1point3acres.com
  10. add_strs(['9', '3', '2'], 10) -> '14'
  11. """


  12. def add_str_1(a, b):
  13.     alist = [int(x) for x in a[::-1]]
  14.     blist = [int(x) for x in b[::-1]]
  15.     len_a = len(alist)
  16.     len_b = len(blist)
  17.     carry = 0
  18.     i = 0
  19.     res = []
  20.     while i < len_a or i < len_b or carry != 0:
  21.         tmp = carry
  22.         if i < len_a:
  23.             tmp += alist[i]
  24.         if i < len_b:
  25.             tmp += blist[i]. 1point3acres.com/bbs

  26.         if tmp == 3:
  27.             carry = 1
    . From 1point 3acres bbs
  28.             tmp = 1. 鐣欏鐢宠璁哄潧-涓浜╀笁鍒嗗湴
  29.         elif tmp == 2:
  30.             carry = 1
  31.             tmp = 0
  32.         else:
  33.             carry = 0. from: 1point3acres.com/bbs
  34.         res.append(tmp)
  35.         i += 1. 鐣欏鐢宠璁哄潧-涓浜╀笁鍒嗗湴
  36. . 鐗涗汉浜戦泦,涓浜╀笁鍒嗗湴
  37.     return ''.join([str(x) for x in res[::-1]])


  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'
  42.     add('100', '9', 10) -> '109'
  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
  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]

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

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

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


  62. def add_str_3(input_list, base):
  63.     """
  64.     3. Follow up, sum list number strings with specific base
  65.     add_strs(['9', '3', '2'], 10) -> '14'
  66.     """. Waral 鍗氬鏈夋洿澶氭枃绔,
  67.     if not input_list:
  68.         return 0. 鍥磋鎴戜滑@1point 3 acres

  69.     while len(input_list) >= 2:
  70.         a = input_list.pop()
  71.         b = input_list.pop()
  72.         tmp = add_str_2(a, b, base)
  73.         input_list.append(tmp)
  74. -google 1point3acres
  75.     return input_list[0]
复制代码


Unit Test 测试用例如下:. 鐗涗汉浜戦泦,涓浜╀笁鍒嗗湴
  1. import unittest. 鐗涗汉浜戦泦,涓浜╀笁鍒嗗湴
  2. from solution import add_str_1
  3. from solution import add_str_2
  4. from solution import add_str_3
  5. . 鐗涗汉浜戦泦,涓浜╀笁鍒嗗湴

  6. class Test(unittest.TestCase):

  7.     def test_add_str_1(self):.鏈枃鍘熷垱鑷1point3acres璁哄潧
  8.         a = '110'
  9.         b = '110'
  10.         res = add_str_1(a, b)
  11.         self.assertEqual('1100', res) 鏉ユ簮涓浜.涓夊垎鍦拌鍧.

  12.     def test_add_str_2_1(self):
  13.         a = '110'
  14.         b = '110'
  15.         base = 2 鏉ユ簮涓浜.涓夊垎鍦拌鍧.
  16.         res = add_str_2(a, b, base)
  17.         self.assertEqual('1100', res)

  18.     def test_add_str_2_2(self):
  19.         a = '999'. 鐗涗汉浜戦泦,涓浜╀笁鍒嗗湴
  20.         b = '1'
  21.         base = 10
  22.         res = add_str_2(a, b, base)
  23.         self.assertEqual('1000', res). 1point3acres.com/bbs

  24.     def test_add_str_2_3(self): 鏉ユ簮涓浜.涓夊垎鍦拌鍧.
  25.         a = '7'. From 1point 3acres bbs
  26.         b = '2'
  27.         base = 8
  28.         res = add_str_2(a, b, base)
  29.         self.assertEqual('11', res)

  30.     def test_add_str_3_1(self):
  31.         input_list = ['9', '4', '3']
  32.         base = 10
  33.         res = add_str_3(input_list, base)
  34.         self.assertEqual('16', res)

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


发题攒人品,求过。
. 鐗涗汉浜戦泦,涓浜╀笁鍒嗗湴

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