Implementation

Simulations and everyday programs, done carefully.

51 problems

Title	Tags	Acceptance	Difficulty
1. String to Integer	Parsing	—	Medium
2. Roman to Integer	Hash Map	—	Easy
3. Integer to Roman	Greedy	—	Medium
4. Zigzag Conversion	Simulation	—	Medium
5. Count and Say	Simulation	—	Medium
6. Collatz Steps	Simulation	—	Easy
7. Leap Years in a Range	Inclusion–Exclusion	—	Easy
8. Clock Angle	Geometry	—	Easy
9. Triangle Type	Geometry	—	Easy
10. Points in Rectangle	Geometry	—	Easy
11. Game of Life — One Step	Simulation	—	Medium
12. Grade Calculator	Conditionals	—	Easy
13. Electricity Bill	Conditionals · Slabs	—	Easy
14. Loan EMI	Formula	—	Medium
15. Day of the Week	Calendar · Zeller	—	Medium
16. Days Between Dates	Calendar	—	Medium
17. 12-Hour to 24-Hour Time	Parsing	—	Easy
18. Seconds to H:M:S	Arithmetic	—	Easy
19. Tic-Tac-Toe Winner	Simulation	—	Easy
20. ATM Withdrawal	Conditionals	—	Easy
21. Parking Fee	Ceil Division	—	Easy
22. Vending Machine Change	Greedy	—	Easy
23. Bank Account Statement	Simulation	—	Medium
24. Library Fine	Conditionals · Dates	—	Easy
25. Password Strength	Validation	—	Easy
26. Validate an IPv4 Address	Parsing · Validation	—	Medium
27. Validate an Email Address	Validation	—	Medium
28. Minesweeper Numbers	Grid	—	Medium
29. Elevator Travel	Simulation	—	Easy
30. Waiting Time at a Counter	Simulation	—	Medium
31. Traffic Light Colour	Modular Arithmetic	—	Easy
32. Word Wrap	Greedy	—	Medium
33. Centre the Text	Formatting	—	Easy
34. Text Histogram	Counting	—	Easy
35. Running Median	Heaps	—	Hard
36. LRU Cache	Design · Linked Hash Map	—	Medium
37. Snakes and Ladders	BFS	—	Hard
38. Bowling Score	Simulation	—	Hard
39. Number to Words	Recursion · Formatting	—	Hard
40. Basic Calculator	Parsing · Stack	—	Hard
41. Inventory Orders	Hash Map · Simulation	—	Medium
42. Rainfall Statistics	Aggregation	—	Easy
43. Cinema Seat Booking	Simulation	—	Medium
44. Temperature Converter	Formula	—	Easy
45. Shopping Cart Total	Arithmetic	—	Easy
46. Robot Moves	Simulation	—	Easy
47. Attendance Shortfall	Math	—	Easy
48. Lottery Matches	Set	—	Easy
49. Robot Return to Origin	Simulation	—	Easy
50. Final Value After Operations	Simulation	—	Easy
51. Water Bottles	Simulation	—	Easy

51 of 51 problems