DSA Problems in Java

Arrays:

• Easy:
  • 1. Two Sum - code
  • 1672. Richest Customer Wealth - code
  • 1337. The K Weakest Rows in a Matrix - code
  • 496. Next Greater Element I - code
  • 1475. Final Prices With a Special Discount in a Shop - code
  • 1979. Find Greatest Common Divisor of Array - code
  • 485. Max Consecutive Ones - code
  • 905. Sort Array By Parity - code
  • Gfg. Segregate 0s and 1s - code
• Medium:
  • 54. Spiral Matrix I - code
  • 59. Spiral Matrix II - code
  • 2326. Spiral Matrix IV - code
  • 1996. The Number of Weak Characters in Game - code
  • 503. Next Greater Element II - code
  • 75. Sort Colors - code
• Hard:
  • 41. First Missing Positive - code

Math:

• Easy:
  • 412. Fizz Buzz - code
  • 9. Palindrome Number - code
  • 1281. Subtract the Product and Sum of Digits of an Integer - code
  • 1290. Convert Binary Number in a Linked List to Integer - code
  • 231. Power of Two - code
  • 1175. Prime Arrangements - code
  • 258. Add Digits - code
  • 202. Happy Number - code
  • Gfg. LCM and GCD - code
  • Gfg. Armstrong Number - code
  • Gfg. Count digits - code
  • Gfg. Decimal to Binary - code
  • Gfg. Binary to Decimal - code
  • Gfg. Sum of all divisors from 1 to n - code
  • Gfg. Sieve of Eratosthenes - code
  • Gfg. Prime Factors - code
• Medium:
  • 7. Reverse Integer - code
  • 1390. Four Divisors - code
  • 204. Count Primes - code

Bit Manipulation:

• Easy:
  • 191. Number of 1 Bits - code
  • 476. Number Complement - code
  • 190. Reverse Bits - code
  • 136. Single Number I - code
  • 2220. Minimum Bit Flips to Convert Number - code
  • 338. Counting Bits - code
  • 137. Single Number II - code
  • 260. Single Number III - code
  • 405. Convert a Number to Hexadecimal - code
  • 268. Missing Number - code
  • 67. Add Binary - code
  • Gfg. Check whether K-th bit is set or not - code
  • Gfg. Odd or Even - code
  • Gfg. Set kth bit - code
  • Gfg. Set the rightmost unset bit - code
  • Gfg. Find position of set bit - code
  • Gfg. Copy Set Bits in Range - code
  • Gfg. Find XOR of numbers from L to R - code
• Medium:
  • 371. Sum of Two Integers - code
  • 201. Bitwise AND of Numbers Range - code
  • 1680. Concatenation of Consecutive Binary Numbers - code
  • 78. Subsets - code
  • 50. Pow(x, n) - code
  • 29. Divide Two Integers - code
  • Gfg. Count total set bits - code

Strings:

• Easy:
  • 557. Reverse Words in a String III - code

Trees:

• Easy:
  • 94. Binary Tree Inorder Traversal - code
  • 144. Binary Tree Preorder Traversal - code

Pattens:

• codes