From 7f4849e9dffeb6e9df880411e8d76925a12a9ce7 Mon Sep 17 00:00:00 2001
From: kmk028 <kmk028@users.noreply.github.com>
Date: Wed, 11 Nov 2020 00:56:36 -0800
Subject: [PATCH 01/10] Helper functions added

---
 projects/graph/graph.py | 66 ++++++++++++++++++++++++++++++-----------
 1 file changed, 49 insertions(+), 17 deletions(-)

diff --git a/projects/graph/graph.py b/projects/graph/graph.py
index 59fecae4b..e379d75ad 100644
--- a/projects/graph/graph.py
+++ b/projects/graph/graph.py
@@ -3,29 +3,57 @@
 """
 from util import Stack, Queue  # These may come in handy
 
+
+
 class Graph:
 
     """Represent a graph as a dictionary of vertices mapping labels to edges."""
     def __init__(self):
+        # vertex ID --> set of neighbors
         self.vertices = {}
 
+    # def __repr__(self):
+    #     return str(self.vertices)
+
     def add_vertex(self, vertex_id):
         """
         Add a vertex to the graph.
         """
-        pass  # TODO
-
-    def add_edge(self, v1, v2):
+        self.vertices[vertex_id] = set()
+        
+    # adds directed edge from "from_vertex" to "to_vertex"
+    def add_edge(self, from_vertex_id, to_vertex_id):
         """
         Add a directed edge to the graph.
         """
-        pass  # TODO
+        if from_vertex_id not in self.vertices or to_vertex_id not in self.vertices:
+            print ("Attempting to add edge to non existing node")
+            return
+        self.vertices[from_vertex_id].add(to_vertex_id) #.add is method for set
 
     def get_neighbors(self, vertex_id):
         """
         Get all neighbors (edges) of a vertex.
         """
-        pass  # TODO
+        return self.vertices[vertex_id]
+
+    #remove vertex from graph and any incoming edges to it
+    def remove_vertex(self,vertex_id):
+        if vertex_id not in self.vertices:
+            print("Attempting to remove non existant vertices")
+            return
+
+        self.vertices.pop(vertex_id)
+        for remaining_vertex in self.vertices:
+            self.vertices[remaining_vertex].discard(vertex_id)
+
+    def remove_edge(self,from_vertex_id,to_vertex_id):
+        if from_vertex_id not in self.vertices or to_vertex_id not in self.vertices:
+            print("Attempting to remove edges non existant vertex")
+            return
+        self.vertices[from_vertex_id].discard(to_vertex_id)
+        
+        
 
     def bft(self, starting_vertex):
         """
@@ -103,6 +131,10 @@ def dfs_recursive(self, starting_vertex, destination_vertex):
     '''
     print(graph.vertices)
 
+    graph.remove_edge(8,1)
+
+    print(graph.vertices)
+
     '''
     Valid BFT paths:
         1, 2, 3, 4, 5, 6, 7
@@ -131,15 +163,15 @@ def dfs_recursive(self, starting_vertex, destination_vertex):
     graph.dft_recursive(1)
 
     '''
-    Valid BFS path:
-        [1, 2, 4, 6]
-    '''
-    print(graph.bfs(1, 6))
-
-    '''
-    Valid DFS paths:
-        [1, 2, 4, 6]
-        [1, 2, 4, 7, 6]
-    '''
-    print(graph.dfs(1, 6))
-    print(graph.dfs_recursive(1, 6))
+    # Valid BFS path:
+    #     [1, 2, 4, 6]
+    # '''
+    # print(graph.bfs(1, 6))
+
+    # '''
+    # Valid DFS paths:
+    #     [1, 2, 4, 6]
+    #     [1, 2, 4, 7, 6]
+    # '''
+    # print(graph.dfs(1, 6))
+    # print(graph.dfs_recursive(1, 6))

From 855c50be25d6d8d6d9db001f3a05e2e755f804f4 Mon Sep 17 00:00:00 2001
From: kmk028 <kmk028@users.noreply.github.com>
Date: Wed, 11 Nov 2020 20:47:38 -0800
Subject: [PATCH 02/10] dft,bft and dfs added

---
 projects/graph/graph.py | 57 ++++++++++++++++++++++++++++++++---------
 1 file changed, 45 insertions(+), 12 deletions(-)

diff --git a/projects/graph/graph.py b/projects/graph/graph.py
index e379d75ad..459554860 100644
--- a/projects/graph/graph.py
+++ b/projects/graph/graph.py
@@ -4,7 +4,7 @@
 from util import Stack, Queue  # These may come in handy
 
 
-
+from collections import deque
 class Graph:
 
     """Represent a graph as a dictionary of vertices mapping labels to edges."""
@@ -60,16 +60,35 @@ def bft(self, starting_vertex):
         Print each vertex in breadth-first order
         beginning from starting_vertex.
         """
-        pass  # TODO
+        queue = deque()
+        visited = set()
+        queue.append(starting_vertex)
+        while len(queue)>0:
+            currNode = queue.popleft()
+            if currNode not in visited:
+                visited.add(currNode)
+                print (currNode)
+                for neigbor in self.vertices[currNode]:
+                    queue.append(neigbor)
 
     def dft(self, starting_vertex):
         """
         Print each vertex in depth-first order
         beginning from starting_vertex.
         """
-        pass  # TODO
+        stack = deque()
+        visited = set()
+        stack.append(starting_vertex)
+        while len(stack)>0:
+            currNode = stack.pop()
+            if currNode not in visited:
+                visited.add(currNode)
+                print (currNode)
+                for neigbor in self.vertices[currNode]:
+                    stack.append(neigbor)
 
-    def dft_recursive(self, starting_vertex):
+
+    def dft_recursive(self, starting_vertex,visited=set()):
         """
         Print each vertex in depth-first order
         beginning from starting_vertex.
@@ -85,14 +104,29 @@ def bfs(self, starting_vertex, destination_vertex):
         breath-first order.
         """
         pass  # TODO
-
+       
+        
     def dfs(self, starting_vertex, destination_vertex):
         """
         Return a list containing a path from
         starting_vertex to destination_vertex in
         depth-first order.
         """
-        pass  # TODO
+        stack = deque()
+        visited = set()
+        #push the current path you are onto stack, instwead of single vertex
+        stack.append([starting_vertex])
+        while len(stack)>0:
+            currPath = stack.pop()
+            currNode = currPath[-1] # current node you are on is the last node in the path
+            if currNode == destination_vertex:
+                return currPath
+            if currNode not in visited:
+                visited.add(currNode)
+                for neigbor in self.vertices[currNode]:
+                    newPath = list(currPath) # make copy of curr path
+                    newPath.append(neigbor)
+                    stack.append(newPath)
 
     def dfs_recursive(self, starting_vertex, destination_vertex):
         """
@@ -131,9 +165,7 @@ def dfs_recursive(self, starting_vertex, destination_vertex):
     '''
     print(graph.vertices)
 
-    graph.remove_edge(8,1)
-
-    print(graph.vertices)
+    # graph.remove_edge(8,1)
 
     '''
     Valid BFT paths:
@@ -159,8 +191,8 @@ def dfs_recursive(self, starting_vertex, destination_vertex):
         1, 2, 4, 7, 6, 3, 5
         1, 2, 4, 6, 3, 5, 7
     '''
-    graph.dft(1)
-    graph.dft_recursive(1)
+    # graph.dft(1)
+    # graph.dft_recursive(1)
 
     '''
     # Valid BFS path:
@@ -173,5 +205,6 @@ def dfs_recursive(self, starting_vertex, destination_vertex):
     #     [1, 2, 4, 6]
     #     [1, 2, 4, 7, 6]
     # '''
-    # print(graph.dfs(1, 6))
+    print(graph.dfs(1, 6))
     # print(graph.dfs_recursive(1, 6))
+

From 089bba9c08bfe7ef8e1b8de52b3b2fe1bdcca3f1 Mon Sep 17 00:00:00 2001
From: kmk028 <kmk028@users.noreply.github.com>
Date: Wed, 11 Nov 2020 23:06:09 -0800
Subject: [PATCH 03/10] dft recursive done

---
 projects/graph/graph.py | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/projects/graph/graph.py b/projects/graph/graph.py
index 459554860..99e268d09 100644
--- a/projects/graph/graph.py
+++ b/projects/graph/graph.py
@@ -95,7 +95,12 @@ def dft_recursive(self, starting_vertex,visited=set()):
 
         This should be done using recursion.
         """
-        pass  # TODO
+        
+        if starting_vertex not in visited:
+            print(starting_vertex)
+            visited.add(starting_vertex)
+            for neighbor in self.vertices[starting_vertex]:
+                self.dft_recursive(neighbor,visited)
 
     def bfs(self, starting_vertex, destination_vertex):
         """
@@ -182,7 +187,7 @@ def dfs_recursive(self, starting_vertex, destination_vertex):
         1, 2, 4, 3, 7, 6, 5
         1, 2, 4, 3, 7, 5, 6
     '''
-    graph.bft(1)
+    #graph.bft(1)
 
     '''
     Valid DFT paths:
@@ -191,8 +196,8 @@ def dfs_recursive(self, starting_vertex, destination_vertex):
         1, 2, 4, 7, 6, 3, 5
         1, 2, 4, 6, 3, 5, 7
     '''
-    # graph.dft(1)
-    # graph.dft_recursive(1)
+    #graph.dft(1)
+    graph.dft_recursive(1)
 
     '''
     # Valid BFS path:
@@ -205,6 +210,6 @@ def dfs_recursive(self, starting_vertex, destination_vertex):
     #     [1, 2, 4, 6]
     #     [1, 2, 4, 7, 6]
     # '''
-    print(graph.dfs(1, 6))
+    # print(graph.dfs(1, 6))
     # print(graph.dfs_recursive(1, 6))
 

From 567dcf15c17f14a1c15fc3f46cf52c73c8521039 Mon Sep 17 00:00:00 2001
From: kmk028 <kmk028@users.noreply.github.com>
Date: Wed, 11 Nov 2020 23:14:07 -0800
Subject: [PATCH 04/10] BFS complete

---
 projects/graph/graph.py | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/projects/graph/graph.py b/projects/graph/graph.py
index 99e268d09..ab7934a3e 100644
--- a/projects/graph/graph.py
+++ b/projects/graph/graph.py
@@ -108,7 +108,20 @@ def bfs(self, starting_vertex, destination_vertex):
         starting_vertex to destination_vertex in
         breath-first order.
         """
-        pass  # TODO
+        queue = deque()
+        visited = set()
+        queue.append([starting_vertex])
+        while len(queue)>0:
+            currPath = queue.popleft()
+            currNode = currPath[-1]
+            if currNode == destination_vertex:
+                return currPath
+            if currNode not in visited:
+                visited.add(currNode)
+                for neighbor in self.vertices[currNode]:
+                    newPath = list(currPath)
+                    newPath.append(neighbor)
+                    queue.append(newPath)
        
         
     def dfs(self, starting_vertex, destination_vertex):
@@ -197,13 +210,13 @@ def dfs_recursive(self, starting_vertex, destination_vertex):
         1, 2, 4, 6, 3, 5, 7
     '''
     #graph.dft(1)
-    graph.dft_recursive(1)
+   # graph.dft_recursive(1)
 
     '''
     # Valid BFS path:
     #     [1, 2, 4, 6]
     # '''
-    # print(graph.bfs(1, 6))
+    print(graph.bfs(1, 6))
 
     # '''
     # Valid DFS paths:

From 2f2c3ffaad563f8e00af9c5c97df2d2d1d97ef80 Mon Sep 17 00:00:00 2001
From: kmk028 <kmk028@users.noreply.github.com>
Date: Sun, 15 Nov 2020 15:51:00 -0800
Subject: [PATCH 05/10] DFS recursive complete

---
 projects/graph/graph.py | 40 ++++++++++++++++++++++++++++++++++++----
 1 file changed, 36 insertions(+), 4 deletions(-)

diff --git a/projects/graph/graph.py b/projects/graph/graph.py
index ab7934a3e..668b36839 100644
--- a/projects/graph/graph.py
+++ b/projects/graph/graph.py
@@ -95,7 +95,6 @@ def dft_recursive(self, starting_vertex,visited=set()):
 
         This should be done using recursion.
         """
-        
         if starting_vertex not in visited:
             print(starting_vertex)
             visited.add(starting_vertex)
@@ -154,7 +153,40 @@ def dfs_recursive(self, starting_vertex, destination_vertex):
 
         This should be done using recursion.
         """
-        pass  # TODO
+        visited=set()
+        return self.dfs_recursive_helper([starting_vertex],destination_vertex,visited)
+
+    # return path to goal vertex if it exists , if not it will return empty array.
+    def dfs_recursive_helper(self,curr_path,destination_vertex,visited):
+        curr_vertex = curr_path[-1]
+        #Base-Case
+        if curr_vertex == destination_vertex:
+            return curr_path
+
+        visited.add(curr_vertex)   
+
+        # find neighbors of current vertex and make a copy of current path. 
+        # If neighbor is not in visited then append it to copy of curr path
+        # recurse over copy of curr path , until goal vertex is reached. 
+        for neighbor in self.vertices[curr_vertex]:
+            if neighbor not in visited:
+                new_path = list(curr_path)
+                new_path.append(neighbor)
+                res = self.dfs_recursive_helper(new_path,destination_vertex,visited)
+                if len(res)>0:
+                    return res
+
+        return []
+
+
+
+        
+
+
+        
+
+        
+        
 
 if __name__ == '__main__':
     graph = Graph()  # Instantiate your graph
@@ -216,7 +248,7 @@ def dfs_recursive(self, starting_vertex, destination_vertex):
     # Valid BFS path:
     #     [1, 2, 4, 6]
     # '''
-    print(graph.bfs(1, 6))
+    # print(graph.bfs(1, 6))
 
     # '''
     # Valid DFS paths:
@@ -224,5 +256,5 @@ def dfs_recursive(self, starting_vertex, destination_vertex):
     #     [1, 2, 4, 7, 6]
     # '''
     # print(graph.dfs(1, 6))
-    # print(graph.dfs_recursive(1, 6))
+    print(graph.dfs_recursive(1, 6))
 

From 1f31f5b5419749cb48dcabe4e59f372e8a78a203 Mon Sep 17 00:00:00 2001
From: kmk028 <kmk028@users.noreply.github.com>
Date: Sun, 15 Nov 2020 17:42:19 -0800
Subject: [PATCH 06/10] WordList problem from lecture

---
 projects/wordlist/lecture.py | 76 ++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 projects/wordlist/lecture.py

diff --git a/projects/wordlist/lecture.py b/projects/wordlist/lecture.py
new file mode 100644
index 000000000..0001d9c6c
--- /dev/null
+++ b/projects/wordlist/lecture.py
@@ -0,0 +1,76 @@
+"""
+Given two words (begin_word and end_word), and a dictionary's word list, return the shortest transformation sequence from begin_word to end_word, such that:
+
+Only one letter can be changed at a time.
+Each transformed word must exist in the word list. Note that begin_word is not a transformed word.
+Note:
+
+Return None if there is no such transformation sequence.
+All words contain only lowercase alphabetic characters.
+You may assume no duplicates in the word list.
+You may assume begin_word and end_word are non-empty and are not the same.
+
+Sample:
+beginWord = "hit",
+endWord = "cog",
+wordList = ["hot","dot","dog","lot","log","cog"]
+["hit", "hot", "dot", "dog", "cog"]
+
+beginWord = "hit",
+endWord = "cog",
+wordList = ["hot","dot","dog","lot","log"]
+[]
+
+PLAN:
+Translate in Graph terminology
+Build Graph
+Traverse graph 
+
+Vertex : Word
+Edge: a possible 1 letter transformation from a word to another word
+Weights: None 
+Path: 1 letter Transformations from begin word to end word 
+
+Build Graph:
+Creating all possible transformations in an adjecency list will be too expensive
+how to find out next vertex by determining if its a valid vertex from word list.
+we should visit a vertex if its in the wordlist
+
+Traverse graph :
+Shortest -> BFS
+start from begin word and generate word transformations from it
+enqueue transformations that are in the word list, ignore rest
+once we find endword, return path we took to get there
+"""
+from collections import deque
+
+alphabet = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']
+
+def findLadders(beginWord,endWord,wordlist):
+    words = set(wordlist)
+    visited = set()
+    queue = deque()
+    queue.append([beginWord])
+
+    while len(queue)>0:
+        currPath = queue.popleft()
+        currWord = currPath[-1]
+        if currWord in visited:
+            continue
+
+        visited.add(currWord)
+
+        if currWord == endWord:
+            return currPath
+
+        for i in range (len(currWord)):
+            for letter in alphabet:
+                transformedWord = currWord[:i]+ letter + currWord[i+1:]
+                if transformedWord in wordlist:
+                    newPath = list(currPath)
+                    newPath.append(transformedWord)
+                    queue.append(newPath)
+                    
+    return []
+
+print (findLadders("hit","cog",["hot","dot","dog","lot","log","cog"]))
\ No newline at end of file

From 8b8d1018a0057471240602a9e8351a75c13dc63e Mon Sep 17 00:00:00 2001
From: kmk028 <kmk028@users.noreply.github.com>
Date: Tue, 17 Nov 2020 19:59:21 -0800
Subject: [PATCH 07/10] earliest ancestor complete and workoing

---
 projects/ancestor/ancestor.py | 43 +++++++++++++++++++++++++++++++++--
 projects/graph/graph.py       |  4 ++--
 2 files changed, 43 insertions(+), 4 deletions(-)

diff --git a/projects/ancestor/ancestor.py b/projects/ancestor/ancestor.py
index 3bd003098..4e4d7fa57 100644
--- a/projects/ancestor/ancestor.py
+++ b/projects/ancestor/ancestor.py
@@ -1,3 +1,42 @@
 
-def earliest_ancestor(ancestors, starting_node):
-    pass
\ No newline at end of file
+from collections import deque, defaultdict
+
+def earliest_ancestor(ancestors,starting_node):
+    graph = createGraph(ancestors)
+
+    earliest_ancestor = (starting_node,0)
+
+    stack = deque()
+    stack.append((starting_node,0))
+    visited = set()
+
+    while len(stack)>0:
+        curr = stack.pop()
+        currNode, dist = curr[0],curr[1]
+        visited.add(curr)
+
+        if currNode not in graph:
+            if dist > earliest_ancestor[1]:
+                earliest_ancestor = curr
+            elif ((dist == earliest_ancestor[1]) and (currNode < earliest_ancestor[0])):
+                earliest_ancestor = curr
+        else:
+            for ancestor in graph[currNode]:
+                if ancestor not in visited:
+                    stack.append((ancestor,dist+1))
+    
+    if earliest_ancestor[0] != starting_node:
+        return earliest_ancestor[0]
+    else:
+        return -1
+
+# vertices = {}   
+# ancestors = [[1,3],[2,3],[3,6],[5,6],[5,7],[4,5],[4,8],[8,9],[11,8],[10,1]]
+
+def createGraph(paths):
+        graph = defaultdict(set)
+        for edge in paths:
+            origin,dest = edge[0],edge[1]
+            graph[dest].add(origin) 
+        return graph
+
diff --git a/projects/graph/graph.py b/projects/graph/graph.py
index 668b36839..b54298bd2 100644
--- a/projects/graph/graph.py
+++ b/projects/graph/graph.py
@@ -241,7 +241,7 @@ def dfs_recursive_helper(self,curr_path,destination_vertex,visited):
         1, 2, 4, 7, 6, 3, 5
         1, 2, 4, 6, 3, 5, 7
     '''
-    #graph.dft(1)
+    graph.dft(1)
    # graph.dft_recursive(1)
 
     '''
@@ -256,5 +256,5 @@ def dfs_recursive_helper(self,curr_path,destination_vertex,visited):
     #     [1, 2, 4, 7, 6]
     # '''
     # print(graph.dfs(1, 6))
-    print(graph.dfs_recursive(1, 6))
+    #print(graph.dfs_recursive(1, 6))
 

From e913a2bfebb87ce51a2a4589371dcc65a1541a3a Mon Sep 17 00:00:00 2001
From: kmk028 <kmk028@users.noreply.github.com>
Date: Sun, 29 Nov 2020 13:39:42 -0800
Subject: [PATCH 08/10] earliest ancestor UPER comments

---
 projects/ancestor/ancestor.py | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/projects/ancestor/ancestor.py b/projects/ancestor/ancestor.py
index 4e4d7fa57..e5a62bebd 100644
--- a/projects/ancestor/ancestor.py
+++ b/projects/ancestor/ancestor.py
@@ -1,13 +1,29 @@
 
 from collections import deque, defaultdict
 
+'''
+PLAN:
+Vertex = People
+Edges = parent-child relationships
+Weights = not needed
+Path = persons family tree 
+
+Build Graph: 
+build graph based on edges given, each user has a directed edge to its ancestor/parent. 
+
+Traverse Graph:
+traverse all paths starting from start node. 
+Keep track of farthest node with lowest user ID
+output that node. 
+'''
+
 def earliest_ancestor(ancestors,starting_node):
     graph = createGraph(ancestors)
 
     earliest_ancestor = (starting_node,0)
 
     stack = deque()
-    stack.append((starting_node,0))
+    stack.append((starting_node,0)) # tuple with node ID and its distance from starting node
     visited = set()
 
     while len(stack)>0:
@@ -15,7 +31,7 @@ def earliest_ancestor(ancestors,starting_node):
         currNode, dist = curr[0],curr[1]
         visited.add(curr)
 
-        if currNode not in graph:
+        if currNode not in graph:  # this means its a terminal node (node with no parent, it won't be the key in graph)
             if dist > earliest_ancestor[1]:
                 earliest_ancestor = curr
             elif ((dist == earliest_ancestor[1]) and (currNode < earliest_ancestor[0])):
@@ -33,7 +49,7 @@ def earliest_ancestor(ancestors,starting_node):
 # vertices = {}   
 # ancestors = [[1,3],[2,3],[3,6],[5,6],[5,7],[4,5],[4,8],[8,9],[11,8],[10,1]]
 
-def createGraph(paths):
+def createGraph(paths):  # Building out a graph with child as key and parent as value (directional edge from child to parent.)
         graph = defaultdict(set)
         for edge in paths:
             origin,dest = edge[0],edge[1]

From 47445094a42862eacae8015a4792cb0e5d2f4691 Mon Sep 17 00:00:00 2001
From: kmk028 <kmk028@users.noreply.github.com>
Date: Sun, 29 Nov 2020 15:42:56 -0800
Subject: [PATCH 09/10] populate graph complete

---
 projects/social/social.py | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/projects/social/social.py b/projects/social/social.py
index 8609d8800..1f71fa474 100644
--- a/projects/social/social.py
+++ b/projects/social/social.py
@@ -1,3 +1,5 @@
+import random
+import math
 class User:
     def __init__(self, name):
         self.name = name
@@ -42,11 +44,25 @@ def populate_graph(self, num_users, avg_friendships):
         self.last_id = 0
         self.users = {}
         self.friendships = {}
-        # !!!! IMPLEMENT ME
 
         # Add users
+        for i in range (num_users):
+            self.add_user("User {i}")
+
+        # create frienships using add_friendship
+        possible_frienships = []
+        for user_id in self.users:
+            for friend_id in range(user_id+1,self.last_id+1):
+                possible_frienships.append((user_id,friend_id))
+
+        # shuffle that list 
+        random.shuffle(possible_frienships)
 
         # Create friendships
+        #generate all possible frienships beween users and put them them in list
+        for i in range (math.floor(num_users*avg_friendships/2)):
+            friendship = possible_frienships[i]
+            self.add_friendship(friendship[0],friendship[1])
 
     def get_all_social_paths(self, user_id):
         """

From 8248995f38ef9f004eef2b3f7bdccc409edf810d Mon Sep 17 00:00:00 2001
From: kmk028 <kmk028@users.noreply.github.com>
Date: Sun, 29 Nov 2020 22:02:28 -0800
Subject: [PATCH 10/10] adventure game completed

---
 projects/adventure/adv.py | 103 ++++++++++++++++++++++++++++++++------
 projects/social/social.py |   2 +-
 2 files changed, 88 insertions(+), 17 deletions(-)

diff --git a/projects/adventure/adv.py b/projects/adventure/adv.py
index 8bc540b5e..43e684cc2 100644
--- a/projects/adventure/adv.py
+++ b/projects/adventure/adv.py
@@ -1,13 +1,16 @@
 from room import Room
 from player import Player
 from world import World
-
+from collections import deque
 import random
 from ast import literal_eval
 
 # Load world
 world = World()
 
+#construct a  traversal graph
+#do dft for finding all the possible  room player can move
+#do bfs for finding unexplored direction
 
 # You may uncomment the smaller graphs for development and testing purposes.
 # map_file = "maps/test_line.txt"
@@ -24,12 +27,82 @@
 world.print_rooms()
 
 player = Player(world.starting_room)
+player.current_room = world.starting_room
 
 # Fill this out with directions to walk
 # traversal_path = ['n', 'n']
 traversal_path = []
 
-
+backtrack = {
+    'n': 's',
+    'e': 'w',
+    'w': 'e',
+    's': 'n'}
+
+def bfs(curr_room):
+    visited = set()
+    queue = deque()
+    queue.append((curr_room,[]))
+
+    while len(queue)>0:
+        (room,path) = queue.popleft()
+        if room in visited:
+            continue
+        visited.add(room)
+        for direction in visited_room[room]:
+            if visited_room[room][direction] == '?':
+                return [path,direction]
+            else:
+                newPath = path.copy()
+                newPath.append(direction)
+                next_room = visited_room[room][direction]
+                queue.append((next_room,newPath))
+
+def dft(unexplored_diection):
+    stack = deque()
+    stack.append(unexplored_diection)
+
+    while len(stack)>0:
+        curr_exit = stack.pop()
+        move_direction = curr_exit[-1]
+        if move_direction not in visited_room[player.current_room.id]:
+            continue
+        elif visited_room[player.current_room.id][move_direction] == '?':
+            prev_room = player.current_room.id
+            player.travel(move_direction)
+            traversal_path.append(move_direction)
+
+            visited_room[prev_room][move_direction] = player.current_room.id
+            opposite_val = backtrack[move_direction]
+
+            if player.current_room.id not in visited_room:
+                visited_room[player.current_room.id] = {opposite_val:prev_room}
+            else:
+                visited_room[player.current_room.id][opposite_val] = prev_room
+
+            for direction in player.current_room.get_exits():
+                if direction not in visited_room[player.current_room.id]:
+                    visited_room[player.current_room.id][direction] = '?'
+                    new_dir = []
+                    new_dir.append(direction)
+                    stack.append(new_dir)
+
+    unexplored_diection = bfs(player.current_room.id)
+
+    if unexplored_diection != None:
+        for direction in unexplored_diection[0]:
+            player.travel(direction)
+            traversal_path.append(direction)
+        dft([unexplored_diection[1]])
+
+
+starting_dir = random.choice(player.current_room.get_exits())
+
+visited_room = {player.current_room.id:{}}
+for direction in player.current_room.get_exits():
+    visited_room[player.current_room.id][direction] = '?'
+
+dft(starting_dir)
 
 # TRAVERSAL TEST
 visited_rooms = set()
@@ -46,17 +119,15 @@
     print("TESTS FAILED: INCOMPLETE TRAVERSAL")
     print(f"{len(room_graph) - len(visited_rooms)} unvisited rooms")
 
-
-
-#######
-# UNCOMMENT TO WALK AROUND
-#######
-player.current_room.print_room_description(player)
-while True:
-    cmds = input("-> ").lower().split(" ")
-    if cmds[0] in ["n", "s", "e", "w"]:
-        player.travel(cmds[0], True)
-    elif cmds[0] == "q":
-        break
-    else:
-        print("I did not understand that command.")
+# #######
+# # UNCOMMENT TO WALK AROUND
+# #######
+# player.current_room.print_room_description(player)
+# while True:
+#     cmds = input("-> ").lower().split(" ")
+#     if cmds[0] in ["n", "s", "e", "w"]:
+#         player.travel(cmds[0], True)
+#     elif cmds[0] == "q":
+#         break
+#     else:
+#         print("I did not understand that command.")
diff --git a/projects/social/social.py b/projects/social/social.py
index 1f71fa474..874a562cc 100644
--- a/projects/social/social.py
+++ b/projects/social/social.py
@@ -74,7 +74,7 @@ def get_all_social_paths(self, user_id):
         The key is the friend's ID and the value is the path.
         """
         visited = {}  # Note that this is a dictionary, not a set
-        # !!!! IMPLEMENT ME
+        
         return visited