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Leetcode with dani
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I just watched an amazing video that dives into the theory of relativity and how time works. ⏳
It’s fascinating how scientists always talk about light, and I used to think they had a beef with speed of light 😂 But now I understand why light speed is so special and its profound connection to time. https://youtu.be/5BBHEZFearI?si=dGWI303LG9XXgQYh
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#leet_code_Q_13 #easy #Sliding_window #Q_219 219. Contains Duplicate II
Given an integer array nums and an integer k, return true if there are two distinct indices i and j in the array such that nums[i] == nums[j] and abs(i - j) <= k.
Example 1:
Input: nums = [1,2,3,1], k = 3
Output: true
Example 2:
Input: nums = [1,0,1,1], k = 1
Output: true
Example 3:
Input: nums = [1,2,3,1,2,3], k = 2
Output: false
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219. Contains Duplicate II
Given an integer array nums and an integer k, return true if there are two distinct indices i and j in the array such that nums[i] == nums[j] and abs(i - j) <= k.
Example 1:
Input: nums = [1,2,3,1], k = 3
Output: true
Example 2:
Input: nums = [1,0,1,1], k = 1
Output: true
Example 3:
Input: nums = [1,2,3,1,2,3], k = 2
Output: false
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i recommend this video for those who want to learn sliding window algorithm , we will be working on this algorithm in the coming days
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What will be the output of the following code?
print('Hello' * 3)
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How do you convert a tuple into a list in Python?
a) tuple.toList()
b) list(tuple)
c) tuple.list()
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class Solution:
def reverseString(self, s: List[str]) -> None:
left, right = 0, len(s) - 1
while left < right:
s[left], s[right] = s[right], s[left]
left += 1
right -= 11 257
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#leet_code_Q_12 #easy #two_pointer #Q_202 202.Write an algorithm to determine if a number n 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.
Repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1.
Those numbers for which this process ends in 1 are happy.
Return true if n is a happy number, and false if not.
Example 1:
Input: n = 19
Output: true
Explanation:
12 + 92 = 82
82 + 22 = 68
62 + 82 = 100
12 + 02 + 02 = 1
Example 2:
Input: n = 2
Output: false
Constraints:
1 <= n <= 231 - 1
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344. Reverse String
#Topics #two pointers #strings
Write a function that reverses a string. The input string is given as an array of characters s
You must do this by modifying the input array in-place with O(1) extra memory
Example 1:
Input: s = ["h","e","l","l","o"]
Output: ["o","l","l","e","h"]
Example 2:
Input: s = ["H","a","n","n","a","h"]
Output: ["h","a","n","n","a","H"]
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based on this poll we will start doing two pointer and sliding window respectively
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If a coin rolls around a circular path whose circumference is twice the circumference of the coin, how many full rotations does the coin complete by the time it returns to its starting point?
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