1. 6. ZigZag Conversion

    class Solution(object):
    def convert(self, s, numRows):
        """
        :type s: str
        :type numRows: int
        :rtype: str
        """
        if len(s)!=1 and numRows!=1:
            list=[[] for i in range(numRows)]
            for i in range(0,len(s)):
                j=i%(2*numRows-2)
                div=i//(2*numRows-2)
                if j in range ...
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  2. 5. Longest Palindromic Substring

    class Solution(object):
    def longestPalindrome(self, s):
        """
        :type s: str
        :rtype: str
        """
        long=""
        temp=""
        i=0
        gap = 2
        gap2=1

        if len(s)==1:
            return s

        while i < len(s)-gap:
            if s[i] == s[i+gap]:
                temp=s[i:i+gap+1]
                ii=i
                ii-=1
                gap+=2

                while ...
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  4. 2. Add Two Numbers

    # Definition for singly-linked list.
class ListNode(object):
    def __init__(self, x):
        self.val = x
        self.next = None

class Solution(object):
    def addTwoNumbers(self, l1, l2):
        """
        :type l1: ListNode
        :type l2: ListNode
        :rtype: ListNode
        """
        head = ListNode(0)
        ptr = head
        carry  = 0
        while True:
            if l1 != None:
                carry += l1.val
                l1 = l1 ...
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  5. 1. Two Sum

    class Solution(object):
    def twoSum(self, nums, target):
        """
        :type nums: List[int]
        :type target: int
        :rtype: List[int]
        """
        for i in range(len(nums)):
            for j in range (i+1,len(nums)):
                if target-nums[i]==nums[j]:
                    return [i,j]

if __name__ == "__main__":
    answer = Solution()
    nums=[2, 7, 11 ...
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  6. Download Bird

    import requests
from bs4 import BeautifulSoup
from urlparse import urljoin
import re


def generate_url_list(input_url):
    r = requests.get(input_url)
    soup = BeautifulSoup(r.content, 'html.parser')

    page_list = []
    for link in soup.select('a > img'):
        if "org" in link.parent.get("href"):
            page_list.append(link.parent.get("href"))
            continue
        page_list.append("http ...
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  7. 0. Prime.py

    class Solution(object):
    def isPrime(self, integer):
        i=2
        while i<integer:
            if integer%i==0:
                return False
            else:
                i+=1
        return True

    def printPrime(self,n,m):
        list=[]
        i=n
        while i<=m:
            if self.isPrime(i):
                list.append(i)
            i+=1
        return list

if __name__ == "__main__":
    n = 100 ...
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  8. 20. Valid Parentheses

    class Solution(object):
    def isValid(self, s):
        """
        :type s: str
        :rtype: bool
        """

        list = []
        l=["(","[","{"]
        n=[")","]","}"]
        issy=True

        if len(s) == 0:
            return False

        i=0
        while i<len(s) and issy:
             if s[i] in l:
                list.append(s[i])
             elif len(list)!=0:
                firsti=list[-1]
                if l.index ...
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