Branch 1 (#3)

* 1513

* Upload: "Flower Planting with No adjacent"-Python

Author: lokendra1704

Diff for: Python/1042_FlowerPlantingwithNoAdjacent.py

@@ -0,0 +1,34 @@
+#Difficulty = Medium
+#Submission Speed = 85.81%
+'''
+#The Algorithm is similar to Graph coloring algorithm.
+After making the graph from edge lists,
+We will traverse every node one by one. For every node, create a fresh new list of choices of flowers
+While Traversing a particular node (say NODE A), we will check its neighbours and if any of the neighbour has been assigned
+flower (say flower 'X') we will remove that flower ('X') from the list of choices of the corresponding Node (NODE A)
+'''
+'''
+If  E = Number of Edges
+    V = Number of Vertices/Nodes
+Time Complexity =  O(V+E)
+Space Complexity = O(2V+E)
+'''
+from collections import defaultdict
+class Solution:
+    def gardenNoAdj(self, N, paths):
+
+        #Create Graph
+        graph = defaultdict(list)
+        for i in paths:
+            graph[i[0]].append(i[1])                #Since Graph is Bidirectional, we need to add edge both sides
+            graph[i[1]].append(i[0])
+        flowers = []
+        for i in range(1, N + 1):                   #We will traverse every node one by one
+            choice = [1, 2, 3, 4]                   #create a fresh new list of choices of flowers
+            for k in graph[i]:                      #check its neighbours
+                try:
+                    choice.remove(flowers[k-1])     #if any of the neighbour has been assigned flower (say flower 'X') we will remove that flower ('X')
+                except:
+                    pass
+            flowers.append(choice[0])               #Select the first flower from the remaining choices
+        return flowers

Diff for: README.md

@@ -95,6 +95,16 @@ This repository consists of the solutions of the problems from LeetCode platform
 |  #  | Title           |  Solution       |  Time           | Space           | Difficulty    | Tag          | Note| 
 |-----|---------------- | --------------- | --------------- | --------------- | ------------- |--------------|-----|
 
+<br/>
+<div align="right">
+    <b><a href="#algorithms">⬆️ Back to Top</a></b>
+</div>
+<br/>
+
+## Graph
+|  #  | Title           |  Solution       |  Time           | Space           | Difficulty    | Tag          | Note| 
+|-----|---------------- | --------------- | --------------- | --------------- | ------------- |--------------|-----|
+|1042|[Flower Planting with No Adjacent](https://leetcode.com/problems/flower-planting-with-no-adjacent/)|[Python](./Python/1042_FlowerPlantingwithNoAdjacent.py)|_O(V+E)_|_O(2V+E)_|Medium|Graph|Graph Coloring|
 
 
 <br/>