K5kC | Code & More
Computer Science
Algorithms
Programming Languages
Database
System Design
Problems
Blind 75
Difficulty: Easy
Difficulty: Medium
Difficulty: Hard
Videos
Projects
Android
Data Science
Computer Vision
Simulations
Tools
UUID Generator
Code Formatter
Search
⌘K
Number of Senior Citizens
Copy title
Copy link
easy
Solve on LeetCode
1 Subtopics
Last edited: August 2, 2025
video explanation
Related Tags
bit-manipulation
dynamic-programming
greedy
hash-table
heap-priority-queue
leetcode
math
matrix
prefix-sum
simulation
sorting
string
video
Please enable JavaScript to view the
comments powered by Disqus.