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Home Code Solutions

K-diff Pairs in an Array – LeetCode Solution

K-diff Pairs in an Array - LeetCode Solution Java , Python 3, Python 2 , C , C++, Best and Optimal Solutions , All you need.

BhautikBhalala by BhautikBhalala
September 10, 2022
Reading Time: 2 mins read
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Leetcode All Problems Solutions

Leetcode All Problems Solutions

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Table of Contents

  • K-diff Pairs in an Array – LeetCode Solution Java , Python 3, Python 2 , C , C++, Best and Optimal Solutions , All you need.
  • C++ K-diff Pairs in an Array LeetCode Solution
  • Java K-diff Pairs in an Array LeetCode Solution
  • Python 3 K-diff Pairs in an Array LeetCode Solution
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K-diff Pairs in an Array – LeetCode Solution Java , Python 3, Python 2 , C , C++, Best and Optimal Solutions , All you need.

Given an array of integers nums and an integer k, return the number of unique k-diff pairs in the array.

A k-diff pair is an integer pair (nums[i], nums[j]), where the following are true:

  • 0 <= i, j < nums.length
  • i != j
  • nums[i] - nums[j] == k

Notice that |val| denotes the absolute value of val.

 

Example 1:

Input: nums = [3,1,4,1,5], k = 2
Output: 2
Explanation: There are two 2-diff pairs in the array, (1, 3) and (3, 5).
Although we have two 1s in the input, we should only return the number of unique pairs.

Example 2:

Input: nums = [1,2,3,4,5], k = 1
Output: 4
Explanation: There are four 1-diff pairs in the array, (1, 2), (2, 3), (3, 4) and (4, 5).

Example 3:

Input: nums = [1,3,1,5,4], k = 0
Output: 1
Explanation: There is one 0-diff pair in the array, (1, 1).

 

Constraints:

  • 1 <= nums.length <= 104
  • -107 <= nums[i] <= 107
  • 0 <= k <= 107

C++ K-diff Pairs in an Array LeetCode Solution


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class Solution {
public:
    int findPairs(vector<int>& nums, int k) {
        sort(nums.begin(),nums.end());
        int ans=0,i=0,j=1;
        for(i,j;i<nums.size() and j<nums.size();)
        {
            if(i==j or nums[j]-nums[i]<k)
                j++;
            else 
            {
                if(nums[j]-nums[i]==k)
                {
                    ans++;
                    j++;
                    for(;j<nums.size();j++)
                        if(nums[j]!=nums[j-1])
                            break;
                    if(j==nums.size())
                    return ans;
                    j--;                  
                }
                i++;
                while(i<j and nums[i]==nums[i-1])
                    i++;
            }
        }
        return ans;
    }
};

Java K-diff Pairs in an Array LeetCode Solution


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public class Solution {
    public int findPairs(int[] nums, int k) {
        if (nums == null || nums.length == 0 || k < 0)   return 0;
        
        Map<Integer, Integer> map = new HashMap<>();
        int count = 0;
        for (int i : nums) {
            map.put(i, map.getOrDefault(i, 0) + 1);
        }
        
        for (Map.Entry<Integer, Integer> entry : map.entrySet()) {
            if (k == 0) {
                //count how many elements in the array that appear more than twice.
                if (entry.getValue() >= 2) {
                    count++;
                } 
            } else {
                if (map.containsKey(entry.getKey() + k)) {
                    count++;
                }
            }
        }
        
        return count;
    }
}

 



Python 3 K-diff Pairs in an Array LeetCode Solution


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def findPairs(self, nums, k):
        res = 0
        c = collections.Counter(nums)
        for i in c:
            if k > 0 and i + k in c or k == 0 and c[i] > 1:
                res += 1
        return res

 

which equals to:

 

def findPairs(self, nums, k):
        c = collections.Counter(nums)
        return  sum(k > 0 and i + k in c or k == 0 and c[i] > 1 for i in c)



 

Array-1180
String-562
Hash Table-412
Dynamic Programming-390
Math-368
Sorting-264


Greedy-257
Depth-First Search-256
Database-215
Breadth-First Search-200
Tree-195


Binary Search-191
Matrix-176
Binary Tree-160
Two Pointers-151
Bit Manipulation-140


Stack-133
Heap (Priority Queue)-117
Design-116
Graph-108
Simulation-103
Prefix Sum-96


Backtracking-92
Counting-86
Sliding Window-73
Linked List-69
Union Find-66


Ordered Set-48
Monotonic Stack-47
Recursion-43
Trie-41
Binary Search Tree-40
Divide and Conquer-40


Enumeration-39
Bitmask-37
Queue-33
Memoization-32
Topological Sort-31


Geometry-30
Segment Tree-27
Game Theory-24
Hash Function-24
Binary Indexed Tree-21


Interactive-18
Data Stream-17
String Matching-17
Rolling Hash-17
Shortest Path-16


Number Theory-16
Combinatorics-15
Randomized-12
Monotonic Queue-9
Iterator-9
Merge Sort-9


Concurrency-9
Doubly-Linked List-8
Brainteaser-8
Probability and Statistics-7
Quickselect-7


Bucket Sort-6
Suffix Array-6
Minimum Spanning Tree-5
Counting Sort-5
Shell-4


Line Sweep-4
Reservoir Sampling-4
Eulerian Circuit-3
Radix Sort-3


Strongly Connected Componen-t2
Rejection Sampling-2
Biconnected Component-1

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Tags: Cc++14full solutionGojavajava 15java 7java 8java8javascriptK-diff Pairs in an ArraykotlinLeetCodeLeetCodeSolutionpypy 3Python 2python 3rubyrustSolution
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