Elizabeth Ter Sahakyan - CS27 Week 2 Project 1

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+    "python.pythonPath": "/Applications/anaconda3/envs/conda-pipenv/bin/python"
+}

Pipfile

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+[[source]]
+url = "https://pypi.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[packages]
+
+[dev-packages]
+
+[requires]
+python_version = "3.7"

src/bigo/cs27_notes.py

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+# search
+
+def linear_search(l, value):
+
+    for i in range(len(l)):
+        if i == value:
+            return True
+
+    return False
+
+def binary_search(l, value):
+    if len(l) <= 1:
+        pass
+
+    # define first and last indices
+    first = 0
+    last = len(l) - 1
+
+    # variable to store if found
+    found = False
+
+    # when the first item of the list is not the last item
+    # and found is not True
+    while first <= last and not found:
+        print(1)
+        middle = ( first + last ) // 2
+
+        if value == l[middle]:
+            found = True
+
+        else:
+            if value < l[middle]:
+                last = middle - 1
+            else: 
+                first = middle + 1
+
+    return found
+
+
+# insertion sort
+
+def insertion_sort(l):
+    # separate first element, think of it as sorted
+
+
+    # for all other indices, starting at 1
+    for i in range(1, len(l)):
+
+        # put current number in a temp var
+        temp = l[i]
+
+        # look left, until we find position
+        j = i
+        while j > 0 and temp < l[j-1]:
+            l[j] = l[j-1]
+            j -= 1
+
+            # as we look left, shift items right
+
+        # when left is smaller than temp, or we're at zero, put at this spot
+        l[j] = temp
+
+    return l
+
+l = [3,4,6,1,2,9,4,6,7,0,5]
+l2 = sorted(l)
+print(l)
+value = 4
+print('linear')
+print(linear_search(l2, value))
+print('binary')
+print(binary_search(l2, value))
+print('insertion sort')
+print(f'list: {l}')
+print(insertion_sort(l))
+
+

src/iterative_sorting/iterative_sorting.py

@@ -1,30 +1,62 @@
 # TO-DO: Complete the selection_sort() function below 
-def selection_sort( arr ):
+
+def selection_sort(l):
+
     # loop through n-1 elements
-    for i in range(0, len(arr) - 1):
-        cur_index = i
-        smallest_index = cur_index
+    for i in range(0, len(l) - 1):
+        j = i
+
         # TO-DO: find next smallest element
         # (hint, can do in 3 loc) 
-
+        lowest_num = l[j]
+        lowest_index = j
 
+        for j in range(i, len(l)):
+            if l[j] < lowest_num:
+                lowest_num = l[j]
+                lowest_index = j
 
+        # swap the lowest with the current position
+        swap_num = l[i]
+        l[i] = lowest_num
+        l[lowest_index] = swap_num
 
-        # TO-DO: swap
+    return l
 
 
+# TO-DO:  implement the Bubble Sort function below
+def bubble_sort(l):
+    swap_num = 1
+    while swap_num > 0:
 
+        # reset swap num
+        swap_num = 0
 
-    return arr
+        for i in range(len(l)-1):
 
+            # find smaller neighbors
+            if l[i] > l[i+1]:
 
-# TO-DO:  implement the Bubble Sort function below
-def bubble_sort( arr ):
+                # swap
+                smaller_num = l[i+1]
+                l[i+1] = l[i]
+                l[i] = smaller_num
 
-    return arr
+                # update count
+                swap_num +=1
+
+
+    return l
 
 
 # STRETCH: implement the Count Sort function below
 def count_sort( arr, maximum=-1 ):
 
-    return arr
+    return arr
+
+
+l = [3,4,6,1,2,9,4,6,7,0,5]
+print('selection_sort')
+print(selection_sort(l))
+print('bubble_sort')
+print(bubble_sort(l))