Pair Sum with Python O(n)

Data Center Proxies - Data Collectors - Data Unblockers

Given a list of n integers arr[0..(n-1)], determine the number of different pairs of elements within it which sum to k. If an integer appears in the list multiple times, each copy is considered to be different; that is, two pairs are considered different if one pair includes at least one array index which the other doesn’t, even if they include the same values.

Signature

int numberOfWays(int[] arr, int k)

Input

n is in the range [1, 100,000]. Each value arr[i] is in the range [1, 1,000,000,000]. k is in the range [1, 1,000,000,000].

Data Center Proxies - Data Collectors - Data Unblockers

Output

Return the number of different pairs of elements which sum to k.

Example 1

n = 5 k = 6 arr = [1, 2, 3, 4, 3] output = 2The valid pairs are 2+4 and 3+3.

Example 2

n = 5 k = 6 arr = [1, 5, 3, 3, 3] output = 4There’s one valid pair 1+5, and three different valid pairs 3+3 (the 3rd and 4th elements, 3rd and 5th elements, and 4th and 5th elements).

Solution using Python:

Pair Sum with Python

Complexity:

  • Time: O(n)
  • Space: Array of n and Hash of n (Who cares about space?? really ??)

Execution:

Case 1:

[1, 2, 3, 4, 3]
{1: 1, 2: 1, 3: 2, 4: 1}
Total Pairs is: 2.0

Case 2:

[1, 5, 3, 3, 3]
{1: 1, 5: 1, 3: 3}
Total Pairs is: 4.0




The Cloud is the future: The AWS Certified Solutions Architect – Associate Average salary is $149,446/year. Get Certified Now with the apps below:



‎Solution Architect Assoc. PRO
‎Solution Architect Assoc. PRO
  • ‎Solution Architect Assoc. PRO Screenshot
  • ‎Solution Architect Assoc. PRO Screenshot
  • ‎Solution Architect Assoc. PRO Screenshot
  • ‎Solution Architect Assoc. PRO Screenshot
  • ‎Solution Architect Assoc. PRO Screenshot
  • ‎Solution Architect Assoc. PRO Screenshot
  • ‎Solution Architect Assoc. PRO Screenshot
  • ‎Solution Architect Assoc. PRO Screenshot
  • ‎Solution Architect Assoc. PRO Screenshot
  • ‎Solution Architect Assoc. PRO Screenshot
  • ‎Solution Architect Assoc. PRO Screenshot
  • ‎Solution Architect Assoc. PRO Screenshot
  • ‎Solution Architect Assoc. PRO Screenshot
  • ‎Solution Architect Assoc. PRO Screenshot
  • ‎Solution Architect Assoc. PRO Screenshot
  • ‎Solution Architect Assoc. PRO Screenshot
  • ‎Solution Architect Assoc. PRO Screenshot
  • ‎Solution Architect Assoc. PRO Screenshot



Solution Architect PRO
Solution Architect PRO
Developer:
‪Etienne Noumen‬
Price:
$5.39

‎AWS Certified Developer A. PRO
‎AWS Certified Developer A. PRO
Developer:
DjamgaTech Corp
Price:
$4.99

  • ‎AWS Certified Developer A. PRO Screenshot
  • ‎AWS Certified Developer A. PRO Screenshot
  • ‎AWS Certified Developer A. PRO Screenshot
  • ‎AWS Certified Developer A. PRO Screenshot
  • ‎AWS Certified Developer A. PRO Screenshot
  • ‎AWS Certified Developer A. PRO Screenshot
  • ‎AWS Certified Developer A. PRO Screenshot
  • ‎AWS Certified Developer A. PRO Screenshot
  • ‎AWS Certified Developer A. PRO Screenshot
  • ‎AWS Certified Developer A. PRO Screenshot
  • ‎AWS Certified Developer A. PRO Screenshot
  • ‎AWS Certified Developer A. PRO Screenshot
  • ‎AWS Certified Developer A. PRO Screenshot
  • ‎AWS Certified Developer A. PRO Screenshot
  • ‎AWS Certified Developer A. PRO Screenshot
  • ‎AWS Certified Developer A. PRO Screenshot
  • ‎AWS Certified Developer A. PRO Screenshot
  • ‎AWS Certified Developer A. PRO Screenshot
  • ‎AWS Certified Developer A. PRO Screenshot


AWS Certified Cloud Practitioner Exam Prep CCP PRO
AWS Certified Cloud Practitioner Exam Prep CCP PRO
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot
  • AWS Certified Cloud Practitioner Exam Prep CCP PRO Screenshot


AWS Certified Cloud Practitioner Mock Exams Pro
AWS Certified Cloud Practitioner Mock Exams Pro
Developer:
‪Etienne Noumen‬
Price:
$5.39





AWS Certified Developer Associate Exam Prep
AWS Certified Developer Associate Exam Prep
Developer:
‪Etienne Noumen‬
Price:
Free


‎Djamga PRO: Pick Up Games, BMR
‎Djamga PRO: Pick Up Games, BMR
Developer:
DjamgaTech Corp
Price:
$2.99

  • ‎Djamga PRO: Pick Up Games, BMR Screenshot
  • ‎Djamga PRO: Pick Up Games, BMR Screenshot
  • ‎Djamga PRO: Pick Up Games, BMR Screenshot
  • ‎Djamga PRO: Pick Up Games, BMR Screenshot
  • ‎Djamga PRO: Pick Up Games, BMR Screenshot
  • ‎Djamga PRO: Pick Up Games, BMR Screenshot
  • ‎Djamga PRO: Pick Up Games, BMR Screenshot
  • ‎Djamga PRO: Pick Up Games, BMR Screenshot
  • ‎Djamga PRO: Pick Up Games, BMR Screenshot
  • ‎Djamga PRO: Pick Up Games, BMR Screenshot
  • ‎Djamga PRO: Pick Up Games, BMR Screenshot
  • ‎Djamga PRO: Pick Up Games, BMR Screenshot
  • ‎Djamga PRO: Pick Up Games, BMR Screenshot
  • ‎Djamga PRO: Pick Up Games, BMR Screenshot
  • ‎Djamga PRO: Pick Up Games, BMR Screenshot
  • ‎Djamga PRO: Pick Up Games, BMR Screenshot
  • ‎Djamga PRO: Pick Up Games, BMR Screenshot

Djamga PRO: Pick Up Games Nearby, Fitness, Workout
Djamga PRO: Pick Up Games Nearby, Fitness, Workout
Developer:
Etienne D. Noumen
Price:
$3.49

  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot
  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot
  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot
  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot
  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot
  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot
  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot
  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot
  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot
  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot
  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot
  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot
  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot
  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot
  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot
  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot
  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot
  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot
  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot
  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot
  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot
  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot
  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot
  • Djamga PRO: Pick Up Games Nearby, Fitness, Workout Screenshot

Djamga PRO: Pick Up Games, Health and Fitness Calculator
Djamga PRO: Pick Up Games, Health and Fitness Calculator
Developer:
‪Etienne Noumen‬
Price:
$3.49

Data Center Proxies - Data Collectors - Data Unblockers


taimienphi.vn