归档 2015年4月

题目描述：

Given two strings s and t, determine if they are isomorphic.

Two strings are isomorphic if the characters in s can be replaced to get t.

All occurrences of a character must be replaced with another character while preserving ...

题目描述：

Count the number of prime numbers less than a non-negative number, n

Hint: The number n could be in the order of 100,000 to 5,000,000.

References:

How Many Primes Are There? (https://primes.utm.edu/howmany.html)

Sieve of Eratosthenes (http://en.wikipedia.org/wiki/Sieve_of_Eratosthenes)

题目大意：

统计小于非负整数n的素数的个数

提示：n的范围是100,000到5,000,000 ...

题目描述：

Remove all elements from a linked list of integers that have value val.

Example
Given: 1 --> 2 --> 6 --> 3 --> 4 --> 5 --> 6, val = 6
Return: 1 --> 2 --> 3 --> 4 ...

题目描述：

Write an algorithm to determine if a number is "happy".

A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squares of its digits, and ...

一个搭建在SAE上的Django应用，使用新浪微博提供的Python SDK已经稳定运行一年有余，但最近开始持续出现微博认证失败的状况。

摘录微博Python SDK的错误提示如下所示：

ERROR:django.request:Internal Server Error: /weibo/auth/
Traceback (most recent call last):
  File "/usr/local/sae/python/3rd/django-1.5/django/core/handlers/base.py", line 115, in get_response
    response = callback(request, *callback_args, **callback_kwargs)
  File "/data1/www/htdocs/838/app/1/mysite/views.py", line 42, in auth
    res = weibo_util.keep_user(code,api,redirect_uri)
  File "/data1/www/htdocs/838/app/1/util/weibo_util.py", line 86, in keep_user
    r ...