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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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.1point3acres缃

技术问题如下。. 1point3acres.com/bbs


"""
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. Waral 鍗氬鏈夋洿澶氭枃绔,
add('100', '10', 2) -> '110'
add('100', '9', 10) -> '109'


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: 鏉ユ簮涓浜.涓夊垎鍦拌鍧.
  1. """
  2. 1. Write a function to add the two binary number strings.
  3. e.g.. 鐗涗汉浜戦泦,涓浜╀笁鍒嗗湴
  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'. more info on 1point3acres.com

  8. 3. Follow up, sum list number strings with specific base. visit 1point3acres.com for more.
  9. add_strs(['9', '3', '2'], 10) -> '14'
  10. """


  11. def add_str_1(a, b):. from: 1point3acres.com/bbs
  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)
  16.     carry = 0
  17.     i = 0
  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].鐣欏璁哄潧-涓浜-涓夊垎鍦
  23.         if i < len_b:
  24.             tmp += blist[i]. 1point3acres.com/bbs

  25.         if tmp == 3:
  26.             carry = 1-google 1point3acres
  27.             tmp = 1
  28.         elif tmp == 2:-google 1point3acres
  29.             carry = 1
  30.             tmp = 0. 鐣欏鐢宠璁哄潧-涓浜╀笁鍒嗗湴
  31.         else:
  32.             carry = 0. from: 1point3acres.com/bbs
  33.         res.append(tmp).鏈枃鍘熷垱鑷1point3acres璁哄潧
  34.         i += 1
  35. . Waral 鍗氬鏈夋洿澶氭枃绔,
  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'
  42.     """ 鏉ユ簮涓浜.涓夊垎鍦拌鍧.

  43.     alist = [int(x) for x in a[::-1]]
  44.     blist = [int(x) for x in b[::-1]]. From 1point 3acres bbs
  45.     len_a = len(alist)
  46.     len_b = len(blist)
  47.     carry = 0
  48.     i = 0
  49.     res = [] 鏉ユ簮涓浜.涓夊垎鍦拌鍧.
  50.     while i < len_a or i < len_b or carry != 0:
  51.         tmp = carry
  52.         if i < len_a:
  53.             tmp += alist[i]
  54.         if i < len_b:
  55.             tmp += blist[i]
  56. . visit 1point3acres.com for more.
  57.         carry = tmp / base
  58.         tmp = tmp % base. 鍥磋鎴戜滑@1point 3 acres

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

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

  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(). more info on 1point3acres.com
  73.         tmp = add_str_2(a, b, base)
  74.         input_list.append(tmp) 鏉ユ簮涓浜.涓夊垎鍦拌鍧.
  75. . From 1point 3acres bbs
  76.     return input_list[0]
复制代码


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
  4. from solution import add_str_3


  5. class Test(unittest.TestCase):

  6.     def test_add_str_1(self):
  7.         a = '110'
  8.         b = '110'
  9.         res = add_str_1(a, b)
  10.         self.assertEqual('1100', res)
  11. . visit 1point3acres.com for more.
  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'
  20.         b = '1'
  21.         base = 10. 鍥磋鎴戜滑@1point 3 acres
  22.         res = add_str_2(a, b, base)
  23.         self.assertEqual('1000', res)
  24. . more info on 1point3acres.com
  25.     def test_add_str_2_3(self):
  26.         a = '7'
  27.         b = '2'
  28.         base = 8
  29.         res = add_str_2(a, b, base)
  30.         self.assertEqual('11', res)

  31.     def test_add_str_3_1(self):
  32.         input_list = ['9', '4', '3']. 鍥磋鎴戜滑@1point 3 acres
  33.         base = 10
  34.         res = add_str_3(input_list, base)
  35.         self.assertEqual('16', res). 1point 3acres 璁哄潧

  36. if __name__ == '__main__':. 鐣欏鐢宠璁哄潧-涓浜╀笁鍒嗗湴
  37.     unittest.main(verbosity=2).鏈枃鍘熷垱鑷1point3acres璁哄潧
复制代码


发题攒人品,求过。

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