Forwarded from A2SV - Community
Hello fellow coders,
After a brief break, we've returned! Get ready for our fun weekly community coding contest happening every Saturday 🗓. It's your chance to compete with other awesome programmers, learn more about coding, and, most importantly, have a great time! 🥳
🏆 Contest Details:
📅 Date: November 2, 2024
⏰ Time: 6:00 PM
🔗 Link for Contest: Community Weekly Contest Return - Contest No 1
P.S. Remember to fill out this form to secure your spot for our upcoming community classes and lectures. It’s your golden ticket to enriching experiences you won’t want to miss. 📚✨
After a brief break, we've returned! Get ready for our fun weekly community coding contest happening every Saturday 🗓. It's your chance to compete with other awesome programmers, learn more about coding, and, most importantly, have a great time! 🥳
🏆 Contest Details:
📅 Date: November 2, 2024
⏰ Time: 6:00 PM
🔗 Link for Contest: Community Weekly Contest Return - Contest No 1
P.S. Remember to fill out this form to secure your spot for our upcoming community classes and lectures. It’s your golden ticket to enriching experiences you won’t want to miss. 📚✨
👍2🍌1
Forwarded from LeetCode VIP
🏆 LeetCode 490. The Maze (Premium) 🏆
There's a ball in a maze with:
- Empty spaces (
The ball can roll in any direction:
- Up, down, left, or right 🌐
But here's the catch:
- It won't stop until it hits a wall! 🚧
- Once it stops, it can choose another direction to roll.
### Task 🎯
Given:
- An m x n maze
- The ball's starting position and a destination
Determine:
- Can the ball stop at the destination?
- If yes, return
📝 Assumption: All borders of the maze are walls.
---
### Examples 🔍
Example 1:
Explanation: One possible path: left ➡️ down ➡️ left ➡️ down ➡️ right ➡️ down ➡️ right 🎯
---
Example 2:
Explanation: The ball can pass through the destination, but it cannot stop there. ❌
---
Example 3:
---
### Constraints 📏
- Maze Dimensions:
- Cells contain only
- Start and destination are in empty spaces and won’t initially overlap.
Can you solve it? 🤔
There's a ball in a maze with:
- Empty spaces (
0) and walls (1).The ball can roll in any direction:
- Up, down, left, or right 🌐
But here's the catch:
- It won't stop until it hits a wall! 🚧
- Once it stops, it can choose another direction to roll.
### Task 🎯
Given:
- An m x n maze
- The ball's starting position and a destination
Determine:
- Can the ball stop at the destination?
- If yes, return
true. Otherwise, return false.📝 Assumption: All borders of the maze are walls.
---
### Examples 🔍
Example 1:
Input:
maze = [
[0,0,1,0,0],
[0,0,0,0,0],
[0,0,0,1,0],
[1,1,0,1,1],
[0,0,0,0,0]
],
start = [0,4],
destination = [4,4]
Output: true
Explanation: One possible path: left ➡️ down ➡️ left ➡️ down ➡️ right ➡️ down ➡️ right 🎯
---
Example 2:
Input:
maze = [
[0,0,1,0,0],
[0,0,0,0,0],
[0,0,0,1,0],
[1,1,0,1,1],
[0,0,0,0,0]
],
start = [0,4],
destination = [3,2]
Output: false
Explanation: The ball can pass through the destination, but it cannot stop there. ❌
---
Example 3:
Input:
maze = [
[0,0,0,0,0],
[1,1,0,0,1],
[0,0,0,0,0],
[0,1,0,0,1],
[0,1,0,0,0]
],
start = [4,3],
destination = [0,1]
Output: false
---
### Constraints 📏
- Maze Dimensions:
1 ≤ m, n ≤ 100- Cells contain only
0 (empty) or 1 (wall).- Start and destination are in empty spaces and won’t initially overlap.
Can you solve it? 🤔
👍3✍2❤1🤯1
Leetcode with dani
Photo
share ur answer in the comment section , i will check it
Given a number n, print all primes smaller than or equal to n. It is also given that n is a small number.
Example:
Input : n =10
Output : 2 3 5 7
Input : n = 20
Output: 2 3 5 7 11 13 17 19
Example:
Input : n =10
Output : 2 3 5 7
Input : n = 20
Output: 2 3 5 7 11 13 17 19
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Sieve of Eratosthenes
Given a number n, print all primes smaller than or equal to n. It is also given that n is a small number.
Example:
Input : n =10
Output : 2 3 5 7
Input : n = 20
Output: 2 3 5 7 11 13 17 19
The sieve of Eratosthenes is one of the most efficient ways to find all primes smaller than n when n is smaller than 10 million or so.
Following is the algorithm to find all the prime numbers less than or equal to a given integer n by the Eratosthene’s method:
When the algorithm terminates, all the numbers in the list that are not marked are prime.
Explanation with Example:
Given a number n, print all primes smaller than or equal to n. It is also given that n is a small number.
Example:
Input : n =10
Output : 2 3 5 7
Input : n = 20
Output: 2 3 5 7 11 13 17 19
The sieve of Eratosthenes is one of the most efficient ways to find all primes smaller than n when n is smaller than 10 million or so.
Following is the algorithm to find all the prime numbers less than or equal to a given integer n by the Eratosthene’s method:
When the algorithm terminates, all the numbers in the list that are not marked are prime.
Explanation with Example:
So, the prime numbers are the unmarked ones: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89 and 97.
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🎯 Problem of the Day: Sort Colors
Problem Description
You are given an array
- Represent the colors using integers:
-
-
-
⚠️ Note: You must not use the library's sort function.
---
Example 1
Input:
Output:
Example 2
Input:
Output:
---
📝 Practice Questions for A2SV Preparation
1. Core Problem:
- Solve LeetCode 75: Sort Colors () using Dutch National Flag Algorithm for \( O(n) \) time complexity.
2. Related Problems:
- LeetCode 215 : Kth Largest Element in an Array
- LeetCode 347 : Top K Frequent Elements
- LeetCode 56 : Merge Intervals
3. Challenge Problem:
- LeetCode 88: Merge Sorted Array
---
💡 Tip: Use a two-pointer or three-pointer approach to keep track of boundaries for the different colors! Try to optimize your solution to \( O(n) \) in both time and space.
🧠 Share your solution and discuss your approach with the community! 🌟
Problem Description
You are given an array
nums with \( n \) objects colored red, white, or blue. Sort the array in-place so that objects of the same color are adjacent, with the colors in the order red, white, and blue. - Represent the colors using integers:
-
0 → Red -
1 → White -
2 → Blue ⚠️ Note: You must not use the library's sort function.
---
Example 1
Input:
nums = [2,0,2,1,1,0]
Output:
[0,0,1,1,2,2]
Example 2
Input:
nums = [2,0,1]
Output:
[0,1,2]
---
📝 Practice Questions for A2SV Preparation
1. Core Problem:
- Solve LeetCode 75: Sort Colors () using Dutch National Flag Algorithm for \( O(n) \) time complexity.
2. Related Problems:
- LeetCode 215 : Kth Largest Element in an Array
- LeetCode 347 : Top K Frequent Elements
- LeetCode 56 : Merge Intervals
3. Challenge Problem:
- LeetCode 88: Merge Sorted Array
---
💡 Tip: Use a two-pointer or three-pointer approach to keep track of boundaries for the different colors! Try to optimize your solution to \( O(n) \) in both time and space.
🧠 Share your solution and discuss your approach with the community! 🌟
LeetCode
Sort Colors - LeetCode
Can you solve this real interview question? Sort Colors - Given an array nums with n objects colored red, white, or blue, sort them in-place [https://en.wikipedia.org/wiki/In-place_algorithm] so that objects of the same color are adjacent, with the colors…
👍4
238. Product of Array Except Self
Difficulty: Medium
Problem:
Given an integer array nums, return an array answer such that answer[i] is the product of all elements of nums except nums[i].
Conditions:
- The product of any prefix or suffix of nums is guaranteed to fit in a 32-bit integer.
- Your algorithm must run in O(n) time and must not use the division operation.
Examples:
Input: nums = [1,2,3,4]
Output: [24,12,8,6]
Input: nums = [-1,1,0,-3,3]
Output: [0,0,9,0,0]
Constraints:
2 <= nums.length <= 10^5
-30 <= nums[i] <= 30
Can you solve it?
👍3
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