This repository contains problems and solutions to common interview questions. Please look at the template.py for problem statements only. The solution.py contains a workable solution.
For example, take the problem statement below:
'''
Given a sorted array, A, with possibly duplicated elements, find the indices of the first and last occurrences of a target element, x. Return -1 if the target is not found.
Example:
Input: A = [1,3,3,5,7,8,9,9,9,15], target = 9
Output: [6,8]
Input: A = [100, 150, 150, 153], target = 150
Output: [1,2]
Input: A = [1,2,3,4,5,6,10], target = 9
Output: [-1, -1]
'''
class Solution:
def getRange(self, arr, target):
# Fill this in.
# Test program
arr = [1, 2, 2, 2, 2, 3, 4, 7, 8, 8]
x = 2
print(Solution().getRange(arr, x))
# [1, 4]- An example
solution.py
'''
Given a sorted array, A, with possibly duplicated elements, find the indices of the first and last occurrences of a target element, x. Return -1 if the target is not found.
Example:
Input: A = [1,3,3,5,7,8,9,9,9,15], target = 9
Output: [6,8]
Input: A = [100, 150, 150, 153], target = 150
Output: [1,2]
Input: A = [1,2,3,4,5,6,10], target = 9
Output: [-1, -1]
'''
class Solution:
def getRange(self, arr, target):
start = -1
end = -1
for i in range(len(arr)):
if arr[i] == target:
start = i
break
for j in range(len(arr) - 1, -1, -1):
if arr[j] == target:
end = j
break
return [start, end]
# Fill this in.
# Test program
arr = [1, 2, 2, 2, 2, 3, 4, 7, 8, 8]
x = 2
print(Solution().getRange(arr, x))
#[1, 4]
arr = [1,3,3,5,7,8,9,9,9,15]
x = 9
print(Solution().getRange(arr, x))
# [6, 8]
arr = [100, 150, 150, 153]
x = 150
print(Solution().getRange(arr, x))
# [1, 2]
arr = [1,2,3,4,5,6,10]
x = 9
print(Solution().getRange(arr, x))
# [-1, -1]- Enjoy problem solving!