Permutation Sequence LeetCode Programming Solutions | LeetCode Problem Solutions in C++, Java, & Python [💯Correct]

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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 Permutation Sequence 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.

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

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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 Problem – Permutation Sequence– LeetCode Problem 

Permutation Sequence– LeetCode Problem

Problem:

The set [1, 2, 3, ..., n] contains a total of n! unique permutations.

By listing and labeling all of the permutations in order, we get the following sequence for n = 3:

  1. "123"
  2. "132"
  3. "213"
  4. "231"
  5. "312"
  6. "321"

Given n and k, return the kth permutation sequence.

Example 1:

Input: n = 3, k = 3
Output: "213"

Example 2:

Input: n = 4, k = 9
Output: "2314"

Example 3:

Input: n = 3, k = 1
Output: "123"

Constraints:

  • 1 <= n <= 9
  • 1 <= k <= n!
Permutation Sequence– LeetCode Solutions
Permutation Sequence in C++:
class Solution {
 public:
  string getPermutation(int n, int k) {
    string ans;
    vector<int> nums(n);
    vector<int> factorial(n + 1, 1);  // factorial[i] := i!

    iota(begin(nums), end(nums), 1);

    for (int i = 2; i <= n; ++i)
      factorial[i] = factorial[i - 1] * i;

    --k;  // 0-indexed

    for (int i = n - 1; i >= 0; --i) {
      const int j = k / factorial[i];
      k %= factorial[i];
      ans += to_string(nums[j]);
      nums.erase(begin(nums) + j);
    }

    return ans;
  }
};
Permutation Sequence in Java:
class Solution {
  public String getPermutation(int n, int k) {
    StringBuilder sb = new StringBuilder();
    List<Integer> nums = new ArrayList<>();
    int[] factorial = new int[n + 1]; // factorial[i] := i!

    for (int i = 1; i <= n; ++i)
      nums.add(i);

    Arrays.fill(factorial, 1);
    for (int i = 2; i <= n; ++i)
      factorial[i] = factorial[i - 1] * i;

    --k; // 0-indexed

    for (int i = n - 1; i >= 0; --i) {
      final int j = k / factorial[i];
      k %= factorial[i];
      sb.append(nums.get(j));
      nums.remove(j);
    }

    return sb.toString();
  }
}
Permutation Sequence in Python:
class Solution:
  def getPermutation(self, n: int, k: int) -> str:
    ans = ''
    nums = [i + 1 for i in range(n)]
    factorial = [1] * (n + 1)  # factorial[i] := i!

    for i in range(2, n + 1):
      factorial[i] = factorial[i - 1] * i

    k -= 1  # 0-indexed

    for i in range(n - 1, -1, -1):
      j = k // factorial[i]
      k %= factorial[i]
      ans += str(nums[j])
      nums.pop(j)

    return ans

180 thoughts on “Permutation Sequence LeetCode Programming Solutions | LeetCode Problem Solutions in C++, Java, & Python [💯Correct]”

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