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All DSA Solutions in one repo! You are free to contribute your code.
License: MIT License
🌟 Star it 🍴Fork it 💜 Contribute to it!
Before creating a PR or issue, please do the following:
Check the Contribution Guide.
You can also update the repository according to this structure: Arrays
|
//Given an undirected, connected and weighted graph, find Minimum Spanning Tree (MST) of the graph using Kruskal’s algorithm.
#include<bits/stdc++.h>
using namespace std;
// Creating shortcut for an integer pair
typedef pair<int, int> iPair;
// Structure to represent a graph
struct Graph
{
int V, E;
vector< pair<int, iPair> > edges;
// Constructor
Graph(int V, int E)
{
this->V = V;
this->E = E;
}
// Utility function to add an edge
void addEdge(int u, int v, int w)
{
edges.push_back({w, {u, v}});
}
// Function to find MST using Kruskal's
// MST algorithm
int kruskalMST();
};
// To represent Disjoint Sets
struct DisjointSets
{
int *parent, *rnk;
int n;
// Constructor.
DisjointSets(int n)
{
// Allocate memory
this->n = n;
parent = new int[n+1];
rnk = new int[n+1];
// Initially, all vertices are in
// different sets and have rank 0.
for (int i = 0; i <= n; i++)
{
rnk[i] = 0;
//every element is parent of itself
parent[i] = i;
}
}
// Find the parent of a node 'u'
// Path Compression
int find(int u)
{
/* Make the parent of the nodes in the path
from u--> parent[u] point to parent[u] */
if (u != parent[u])
parent[u] = find(parent[u]);
return parent[u];
}
// Union by rank
void merge(int x, int y)
{
x = find(x), y = find(y);
/* Make tree with smaller height
a subtree of the other tree */
if (rnk[x] > rnk[y])
parent[y] = x;
else // If rnk[x] <= rnk[y]
parent[x] = y;
if (rnk[x] == rnk[y])
rnk[y]++;
}
};
/* Functions returns weight of the MST*/
int Graph::kruskalMST()
{
int mst_wt = 0; // Initialize result
// Sort edges in increasing order on basis of cost
sort(edges.begin(), edges.end());
// Create disjoint sets
DisjointSets ds(V);
// Iterate through all sorted edges
vector< pair<int, iPair> >::iterator it;
for (it=edges.begin(); it!=edges.end(); it++)
{
int u = it->second.first;
int v = it->second.second;
int set_u = ds.find(u);
int set_v = ds.find(v);
// Check if the selected edge is creating
// a cycle or not (Cycle is created if u
// and v belong to same set)
if (set_u != set_v)
{
// Current edge will be in the MST
// so print it
cout << u << " - " << v << endl;
// Update MST weight
mst_wt += it->first;
// Merge two sets
ds.merge(set_u, set_v);
}
}
return mst_wt;
}
// Driver program to test above functions
int main()
{
/* Let us create above shown weighted
and undirected graph */
int V = 9, E = 14;
Graph g(V, E);
// making above shown graph
g.addEdge(0, 1, 4);
g.addEdge(0, 7, 8);
g.addEdge(1, 2, 8);
g.addEdge(1, 7, 11);
g.addEdge(2, 3, 7);
g.addEdge(2, 8, 2);
g.addEdge(2, 5, 4);
g.addEdge(3, 4, 9);
g.addEdge(3, 5, 14);
g.addEdge(4, 5, 10);
g.addEdge(5, 6, 2);
g.addEdge(6, 7, 1);
g.addEdge(6, 8, 6);
g.addEdge(7, 8, 7);
cout << "Edges of MST are \n";
int mst_wt = g.kruskalMST();
cout << "\nWeight of MST is " << mst_wt;
return 0;
}
In the Array folder ,Can i write the code in java else you can tell me in which part should i work on through java language .
Thank - you
I'd like to add an example to the OOPS directory that uses function pointers with C++ classes.
I noticed there's already an implementation in the bit manipulation folder, but I'd like to add a second implementation that uses the standard library to calculate the hamming weight of a number.
Hi @bhumikatewary, I would like to contribute binary tree maximum path sum algorithm.
Please assign this issue to me.
Please assign this issue to me.
Hey @bhumikatewary I want to contribute with code to this problem. Please assign it ot me.
I want to add implementation of finding articulation_points in graph using C++. Please assign this task to me.
I want to add implementation of Prim's Minimum Spanning Tree of a Graph using C++. Please assign this task to me.
There is no trees implementation in java , so i would like to add it
I want to add implementation of Kruskal's minimum spanning tree of a graph using C++. Please assign this task to me.
Hi @bhumikatewary, I would like to add Leetcode problem, 334. Increasing Triplet Subsequence.
Hi @bhumikatewary, I want to add the implementation of DSU.
Can you please assign it to me?
Please assign this issue to me.
Please assign me this issue.
Can I contribute with Tower of Hanoi algorithm?
I'd like to implement the following algorithm for Python:
Given an unsorted integer array, find the first missing positive integer.
Example:
Given [1,2,0] return 3,
[3,4,-1,1] return 2,
[-8, -7, -6] returns 1
Your algorithm should run in O(n) time and use constant space.
I want to add first missing positive integer solution in arrays using java. Please assign this task to me.
Should I add tower of hanoi problem solution (iterative solution using DP) for hacktoberfest
plz assign me the issue
Please assign this issue to me.
I want to contribute this, can I do it ?
I want to add implementation of Strongly Connected Components in Graph using C++. Please assign this task to me.
will create a dedicated folder for Monotonic Stacks and add solutions to some standard questions for this topic.
I would like to upload my stack implementation in java code to you repo
Please add hacktoberfest mark in this
Hi @bhumikatewary , I want to add the c++ solution to the problem: detecting loops in a linked list. Can you assign this task to me?
Raising a request to add Lomuto partition in Sorting
Hi @bhumikatewary, I want to add LPS code in c++ under the DP file section.
Can you please assign it to me?
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