chapter 1: Array

26. Remove Duplicated From Sorted Array

Given a sorted array nums, remove the duplicates in-place such that each element appear only once and return the new length.

Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory.

Example 1:

Given nums = [1,1,2],

Your function should return length = 2, with the first two elements of nums being 1 and 2 respectively.

It doesn't matter what you leave beyond the returned length. Example 2:

Given nums = [0,0,1,1,1,2,2,3,3,4],

Your function should return length = 5, with the first five elements of nums being modified to 0, 1, 2, 3,

and 4 respectively.

It doesn't matter what values are set beyond the returned length.

#! /usr/bin/env python
# -*- coding: utf-8 -*-


class Solution(object):
    def removeDuplicates(self, nums):
        """
        :type nums: List[int]
        :rtype: int
        """
        if not nums:
            return 0

        removed_end = 0
        for i in range(1, len(nums)):
            if nums[i] != nums[removed_end]:
                removed_end += 1
                nums[removed_end] = nums[i]

        return removed_end + 1

"""
[]
[1,1,2,2,3]
[1,3,5,8,9,9,9]
"""

27. Remove Element

31. Next Permutation

41. First Missing Positive

54. Spiral Matrix

57. Insert Interval

59. Spiral Matrix 2

73. Set Matrix Zeroes

118. Pascal Triange

119. Pascal Triangel 2

164. Maximum Gap

189. Rotate Array

228. Summary Ranges

283. Move Zeroes

289. Game of Life