Hakan Loyan's repositories
Login-System-with-Registiration
Created in Java language basic Login-Register system with HashMap.
JavaOdev
Source Files Of Java Lessons's HomeWork-1
Find-the-Index-of-the-First-Occurence-in-a-String-LeetCode
Given two strings needle and haystack, return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.
Maximum-Level-Sum-of-a-Binary-Tree-LeetCode
Given the root of a binary tree, the level of its root is 1, the level of its children is 2, and so on. Return the smallest level x such that the sum of all the values of nodes at level x is maximal.
Spiral-Matrix-II-LeetCode
Given a positive integer n, generate an n x n matrix filled with elements from 1 to n2 in spiral order.
Uncrossed-Lines-LeetCode
I learned Iterative Dynamic Programming on spesifically in the context of this LeetCode problem. It was like a light bulb going off in my mind.
Symmetric-Tree-LeetCode
Given the root of a binary tree, check whether it is a mirror of itself (i.e., symmetric around its center).
Same-Tree-LeetCode
Given the roots of two binary trees p and q, write a function to check if they are the same or not. Two binary trees are considered the same if they are structurally identical, and the nodes have the same value.
Binary-Tree-Inorder-Traversal-LeetCode
Given the root of a binary tree, return the inorder traversal of its nodes' values.
Remove-Duplicates-from-Sorted-List--LeetCode
Given the head of a sorted linked list, delete all duplicates such that each element appears only once. Return the linked list sorted as well.
ClimbingStairs-LeetCode
You are climbing a staircase. It takes n steps to reach the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top?
PlusOne-LeetCode
You are given a large integer represented as an integer array digits, where each digits[i] is the ith digit of the integer. The digits are ordered from most significant to least significant in left-to-right order. The large integer does not contain any leading 0's. Increment the large integer by one and return the resulting array of digits.
Length-of-Last-Word-LeetCode
Given a string s consisting of words and spaces, return the length of the last word in the string. A word is a maximal substring consisting of non-space characters only.
Remove-Element-LeetCode
Given an integer array nums and an integer val, remove all occurrences of val in nums in-place.
Sort-an-Array-LeetCode
Given an array of integers nums, sort the array in ascending order and return it.
Search-Inderst-Position-LeetCode
Given a sorted array of distinct integers and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in order.
Remove-Duplicates-from-Sorted-Array-LeetCode
Given an integer array nums sorted in non-decreasing order, remove the duplicates in-place such that each unique element appears only once. The relative order of the elements should be kept the same.
Merge-Two-Sorted-Lists-LeetCode
You are given the heads of two sorted linked lists list1 and list2. Merge the two lists in a one sorted list. The list should be made by splicing together the nodes of the first two lists. Return the head of the merged linked list.
Valid-Parentheses-LeetCode
Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input string is valid if: Open brackets must be closed by the same type of brackets. Open brackets must be closed in the correct order. Every close bracket has a corresponding open bracket of the same type.
Longest-Common-Prefix-LeetCode
Write a function to find the longest common prefix string amongst an array of strings. If there is no common prefix, return an empty string "".
Kth-Missing-Positive-Number-LeetCode
Given an array arr of positive integers sorted in a strictly increasing order, and an integer k. Return the kth positive integer that is missing from this array.
Palindrome-Number-LeetCode
Given an integer x, return true if x is a palindrome , and false otherwise.
Roman-to-Integer-LeetCode
Turning integers from Roman number ınputs.
TwoSum-LeetCode
Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.