N-Queens LeetCode Programming Solutions | LeetCode Problem Solutions in C++, Java, & Python [💯Correct]

LeetCode Problem | LeetCode Problems For Beginners | LeetCode Problems & Solutions | Improve Problem Solving Skills | LeetCode Problems Java | LeetCode Problems C++

Hello Programmers/Coders, Today we are going to share solutions to the Programming problems of LeetCode Solutions in C++, Java, & Python. At Each Problem with Successful submission with all Test Cases Passed, you will get a score or marks and LeetCode Coins. And after solving maximum problems, you will be getting stars. This will highlight your profile to the recruiters.

In this post, you will find the solution for the N-Queens in C++, Java & Python-LeetCode problem. We are providing the correct and tested solutions to coding problems present on LeetCode. If you are not able to solve any problem, then you can take help from our Blog/website.

Use “Ctrl+F” To Find Any Questions Answer. & For Mobile User, You Just Need To Click On Three dots In Your Browser & You Will Get A “Find” Option There. Use These Option to Get Any Random Questions Answer.

About LeetCode

LeetCode is one of the most well-known online judge platforms to help you enhance your skills, expand your knowledge and prepare for technical interviews. 

LeetCode is for software engineers who are looking to practice technical questions and advance their skills. Mastering the questions in each level on LeetCode is a good way to prepare for technical interviews and keep your skills sharp. They also have a repository of solutions with the reasoning behind each step.

LeetCode has over 1,900 questions for you to practice, covering many different programming concepts. Every coding problem has a classification of either EasyMedium, or Hard.

LeetCode problems focus on algorithms and data structures. Here is some topic you can find problems on LeetCode:

  • Mathematics/Basic Logical Based Questions
  • Arrays
  • Strings
  • Hash Table
  • Dynamic Programming
  • Stack & Queue
  • Trees & Graphs
  • Greedy Algorithms
  • Breadth-First Search
  • Depth-First Search
  • Sorting & Searching
  • BST (Binary Search Tree)
  • Database
  • Linked List
  • Recursion, etc.

Leetcode has a huge number of test cases and questions from interviews too like Google, Amazon, Microsoft, Facebook, Adobe, Oracle, Linkedin, Goldman Sachs, etc. LeetCode helps you in getting a job in Top MNCs. To crack FAANG Companies, LeetCode problems can help you in building your logic.

Link for the ProblemN-Queens– LeetCode Problem

N-Queens– LeetCode Problem

Problem:

The n-queens puzzle is the problem of placing n queens on an n x n chessboard such that no two queens attack each other.

Given an integer n, return all distinct solutions to the n-queens puzzle. You may return the answer in any order.

Each solution contains a distinct board configuration of the n-queens’ placement, where 'Q' and '.' both indicate a queen and an empty space, respectively.

Example 1:

queens
Input: n = 4
Output: [[".Q..","...Q","Q...","..Q."],["..Q.","Q...","...Q",".Q.."]]
Explanation: There exist two distinct solutions to the 4-queens puzzle as shown above

Example 2:

Input: n = 1
Output: [["Q"]]

Constraints:

  • 1 <= n <= 9
N-Queens– LeetCode Solutions
N-Queens  in C++:
struct T {
  int left;   // sum of the subarray w/ max sum (starting from the first num)
  int right;  // sum of the subarray w/ max sum (ending at the the last num)
  int mid;    // sum of the subarray w/ max sum
  int sum;    // sum of the whole array
};

class Solution {
 public:
  int maxSubArray(vector<int>& nums) {
    const T t = divideAndConquer(nums, 0, nums.size() - 1);
    return t.mid;
  }

 private:
  T divideAndConquer(const vector<int>& nums, int l, int r) {
    if (l == r)
      return {nums[l], nums[l], nums[l], nums[l]};

    const int m = l + (r - l) / 2;
    const T t1 = divideAndConquer(nums, l, m);
    const T t2 = divideAndConquer(nums, m + 1, r);

    const int left = max(t1.left, t1.sum + t2.left);
    const int right = max(t1.right + t2.sum, t2.right);
    const int mid = max({t1.right + t2.left, t1.mid, t2.mid});
    const int sum = t1.sum + t2.sum;

    return {left, right, mid, sum};
  };
};
N-Queens in Java:
class Solution {
  public List<List<String>> solveNQueens(int n) {
    List<List<String>> ans = new ArrayList<>();
    char[][] board = new char[n][n];

    for (int i = 0; i < n; ++i)
      Arrays.fill(board[i], '.');

    dfs(n, 0, new boolean[n], new boolean[2 * n - 1], new boolean[2 * n - 1], board, ans);

    return ans;
  }

  private void dfs(int n, int i, boolean[] cols, boolean[] diag1, boolean[] diag2, char[][] board,
                   List<List<String>> ans) {
    if (i == n) {
      ans.add(construct(board));
      return;
    }

    for (int j = 0; j < cols.length; ++j) {
      if (cols[j] || diag1[i + j] || diag2[j - i + n - 1])
        continue;
      board[i][j] = 'Q';
      cols[j] = diag1[i + j] = diag2[j - i + n - 1] = true;
      dfs(n, i + 1, cols, diag1, diag2, board, ans);
      cols[j] = diag1[i + j] = diag2[j - i + n - 1] = false;
      board[i][j] = '.';
    }
  }

  private List<String> construct(char[][] board) {
    List<String> listBoard = new ArrayList<>();
    for (int i = 0; i < board.length; ++i)
      listBoard.add(String.valueOf(board[i]));
    return listBoard;
  }
}
N-Queens in Python:
class Solution:
  def solveNQueens(self, n: int) -> List[List[str]]:
    ans = []
    cols = [False] * n
    diag1 = [False] * (2 * n - 1)
    diag2 = [False] * (2 * n - 1)

    def dfs(i: int, board: List[int]) -> None:
      if i == n:
        ans.append(board)
        return

      for j in range(n):
        if cols[j] or diag1[i + j] or diag2[j - i + n - 1]:
          continue
        cols[j] = diag1[i + j] = diag2[j - i + n - 1] = True
        dfs(i + 1, board + ['.' * j + 'Q' + '.' * (n - j - 1)])
        cols[j] = diag1[i + j] = diag2[j - i + n - 1] = False

    dfs(0, [])

    return ans

176 thoughts on “N-Queens LeetCode Programming Solutions | LeetCode Problem Solutions in C++, Java, & Python [💯Correct]”

  1. ul. Sarmacka 1b, Warszawatel: 22 4283546 YEGO CENTRUM Serwisy regionalne Wszystkie prawa zastrzeżone 2023 – stworzone przezCityon.pl|LocationsFinder We wtorek, 22 listopada odbyła się kolejna Wielkopolska Gala Kajakarzy. W sali sesyjnej Urzędu Marszałkowskiego Województwa Wielkopolskiego w Poznaniu… SHOWROOM YEGO WILANÓW Skorzystaj z doskonałej ceny w obiekcie ClickTheFlat Palace of Culture View Apartment – Marszałkowska St. – ocenionym na 8,7 przez Gości, którzy niedawno się tam zatrzymali Blog Jerzego S. Majewskiego Koncesja Zjednoczonych Przedsiębiorstw Rozrywkowych SA na obiekt w Toruniu wygasa dopiero w 2022 roku. Trudno stwierdzić, co spowodowało taki ruch w interesie, niemniej wpynęło aż pięć wniosków spółek Casino, Astrella, Bookmacher, Medella i dotychczasowego posiadacza koncesji. Radni zaopiniowali dziś wszystkie wnioski negatywni.
    https://www.seo-bookmarks.win/ruletka-gra-planszowa
    Tutaj obowiązują podobne reguły pokerowe, ale sam przebieg gry jest zgoła inny. Gracz otrzymuje do ręki tylko dwie karty. Na stole układane są karty wspólne potrzebne do zbudowania układu. Łącznie jest ich pięć. Przebieg poker online jest następujący: Gracz zapoznaje się ze swoimi kartami, następuje pierwsza licytacja i odsłonięcie trzech kart wspólnych. Kolejna licytacja i odsłonięcie czwartek karty. Trzecia licytacja poprzedza odsłonięcie piątej karty. Tu następuje ostateczna licytacja i sprawdzenie układów zbudowanych przez graczy. Ich popularność zależy od tego, gdzie i w jakich okolicznościach odbywa się rozgrywka. W Razz zagramy podczas turnieju w kasynie, natomiast w 7 kartowego studa zagramy w kasynie we wschodniej części Stanów Zjednoczonych.

    Reply
  2. cost of generic mobic without dr prescription [url=https://mobic.store/#]get cheap mobic for sale[/url] where to get generic mobic pills

    Reply
  3. can i buy amoxicillin online: [url=http://amoxicillins.com/#]amoxicillin buy no prescription[/url] amoxicillin 500mg buy online canada

    Reply
  4. cheap mobic no prescription [url=https://mobic.store/#]where to buy generic mobic online[/url] order generic mobic online

    Reply
  5. mexico drug stores pharmacies [url=http://mexicanpharmacy.guru/#]mexico drug stores pharmacies[/url] best online pharmacies in mexico

    Reply
  6. Wonderful items from you, man. I have bear in mind your stuff prior
    to and you’re simply extremely wonderful. I actually like what you have acquired
    right here, really like what you are saying and the way during
    which you say it. You make it enjoyable and you continue to care for to stay it wise.
    I cant wait to learn far more from you. That is actually
    a wonderful site.

    Reply
  7. To announce present dispatch, dog these tips:

    Look for credible sources: https://www.wellpleased.co.uk/wp-content/pages/which-technique-is-the-most-effective-for.html. It’s material to safeguard that the report outset you are reading is reputable and unbiased. Some examples of good sources tabulate BBC, Reuters, and The Fashionable York Times. Announce multiple sources to stimulate a well-rounded sentiment of a discriminating news event. This can better you return a more ended display and keep bias. Be aware of the viewpoint the article is coming from, as set respectable news sources can be dressed bias. Fact-check the dirt with another commencement if a scandal article seems too unequalled or unbelievable. Till the end of time pass inevitable you are reading a known article, as expos‚ can change quickly.

    Close to following these tips, you can fit a more au fait scandal reader and more intelligent know the cosmos about you.

    Reply
  8. It’s that easy! So what are you waiting for? Head on over to Golden Nugget Online Casino and claim your amazing bonus offer today. With 200 free spins and a huge deposit bonus, there’s never been a better time to join the fun and start winning big at Golden Nugget. For new customers, you’ll have to sign-up and create an account, then opt in to get your Welcome Offer of 20 Free Spins on Lucky Mr Green. This casino bonus allows you to play before staking any of your own money. A perfect free spins offer should give you a decent number of rounds on a popular slots game and have good terms. For example, 50 free spins on Greedy Goblins with a 10x wagering requirement for the winnings is ideal. But seeing as the $100 free play can be used on slot titles, and an incredible selection of slot machines at that, we felt we could encourage you to use it as 200 free spins instead. It’s so simple to claim too, because all you need to do is register and wager $1 on casino games and the 200 free spins will be all yours.
    http://www.popsotong.com/gb/bbs/board.php?bo_table=free&wr_id=28706
    An ambitious project whose goal is to celebrate the greatest and the most responsible companies in iGaming and give them the recognition they deserve. Free roulette games offer exactly the same fun, fast-paced gameplay as their real money counterparts. The difference is really in the prizes on offer. Free roulette is played just for the fun of it, whereas in real money roulette there’s the additional thrill of potentially huge sums of money up for grabs. Yes, there is! Get up to $1000 back if you’re down after your first day! Plus, get access to free spins, bet bonuses and more when you start playing casino games at FanDuel Casino! Keep in mind that the best online slots real money that we offer on our website come with the most thrilling features that will allow you to enjoy spinning the reels non-stop. You will be able to find fun free spin features and bonus rounds. At the same time, each slot machine that we offer will impress you with interesting scatters, wilds, and other exciting symbols.

    Reply
  9. Hi this is somewhat of off topic but I was wondering if blogs use WYSIWYG editors
    or if you have to manually code with HTML. I’m starting
    a blog soon but have no coding knowledge so I wanted to
    get advice from someone with experience. Any help would be enormously appreciated!

    Reply
  10. Altogether! Declaration news portals in the UK can be crushing, but there are numerous resources at to cure you espy the best in unison as you. As I mentioned before, conducting an online search with a view http://tfcscotland.org.uk/wp-content/pages/what-is-gnd-news-all-you-need-to-know.html “UK newsflash websites” or “British news portals” is a enormous starting point. Not no more than desire this give you a thorough slate of communication websites, but it choice also lend you with a punter understanding of the coeval news scene in the UK.
    In the good old days you obtain a file of imminent story portals, it’s important to gauge each anyone to choose which best suits your preferences. As an example, BBC Intelligence is known for its disinterested reporting of news stories, while The Custodian is known representing its in-depth criticism of governmental and group issues. The Disinterested is known pro its investigative journalism, while The Times is known for its business and investment capital coverage. By way of arrangement these differences, you can select the rumour portal that caters to your interests and provides you with the news you have a yen for to read.
    Additionally, it’s quality all things neighbourhood despatch portals because fixed regions within the UK. These portals provide coverage of events and scoop stories that are akin to the area, which can be firstly cooperative if you’re looking to keep up with events in your close by community. For occurrence, local communiqu‚ portals in London classify the Evening Paradigm and the Londonist, while Manchester Evening News and Liverpool Repercussion are popular in the North West.
    Overall, there are many statement portals readily obtainable in the UK, and it’s high-level to do your digging to see the one that suits your needs. By means of evaluating the contrasting news portals based on their coverage, variety, and position statement viewpoint, you can decide the one that provides you with the most fitting and interesting low-down stories. Esteemed luck with your search, and I ambition this data helps you reveal the practised news broadcast portal suitable you!

    Reply

Leave a Comment

Ads Blocker Image Powered by Code Help Pro

Ads Blocker Detected!!!

We have detected that you are using extensions to block ads. Please support us by disabling these ads blocker🙏.

Powered By
Best Wordpress Adblock Detecting Plugin | CHP Adblock