Add problem set 1 solutions

Author: mbazhlekova

week 1/lectures/guess-and-check.py

@@ -0,0 +1,4 @@
+cube = 27
+for guess in range(cube + 1):
+    if guess**3 == cube:
+        print("Cube root of ", cube, " is ", guess)

week 1/pset1/problem-1.py

@@ -0,0 +1,9 @@
+str = input("Enter a string: ")
+vowels = ["a", "e", "i", "o", "u"]
+vowel_count = 0
+
+for letter in str:
+    if letter in vowels:
+        vowel_count += 1
+
+print("Number of vowels: ", vowel_count)

week 1/pset1/problem-2.py

@@ -0,0 +1,8 @@
+str = input("Enter a string: ")
+bob_count = 0
+
+for i in range(len(str) - 2):
+    if str[i:(i+3)] == 'bob':
+        bob_count += 1
+
+print("Number of times bob occurs is: ", bob_count)

week 1/pset1/problem-3.py

@@ -0,0 +1,18 @@
+str = input("Enter a string: ")
+substrings = []
+current_substring = []
+
+for i in range(len(str) - 2):
+    if str[i] <= str[i + 1]:
+        current_substring.append(str[i])
+        if str[i + 1] > str[i + 2]:
+            current_substring.append(str[i + 1])
+            substrings.append(''.join(current_substring))
+            current_substring = []
+
+min_substring = substrings[0]
+for i in substrings:
+    if (len(i) > len(min_substring)):
+        min_substring = i
+
+print(min_substring)