꿈꾸는공학도

https://leetcode.com/problems/subtree-of-another-tree/description/Given the roots of two binary trees root and subRoot, return true if there is a subtree of root with the same structure and node values of subRoot and false otherwise.A subtree of a binary tree tree is a tree that consists of a node in tree and all of this node's descendants. The tree tree could also be considered as a subtree of ..

Given an array nums of distinct integers, return all the possible permutations. You can return the answer in any order. Example 1:Input: nums = [1,2,3]Output: [[1,2,3],[1,3,2],[2,1,3],[2,3,1],[3,1,2],[3,2,1]]Example 2:Input: nums = [0,1]Output: [[0,1],[1,0]]Example 3:Input: nums = [1]Output: [[1]] Constraints:1 -10 All the integers of nums are unique.뭔가 기본적인 컨셉의 문제인데, 이게 또 한 번쯤은 집고 넘어가줘야 찝찝한게 없다..

https://leetcode.com/problems/reverse-linked-list-ii/description/Given the head of a singly linked list and two integers left and right where left  left to position right, and return the reversed list. Example 1:Input: head = [1,2,3,4,5], left = 2, right = 4Output: [1,4,3,2,5]Example 2:Input: head = [5], left = 1, right = 1Output: [5] Constraints:The number of nodes in the list is n.1 -500 1  Fo..

이번엔, C++ 코딩을 하며 자주 마주하는 디버깅의 현장을 살펴보겠다. 관련자료는 아래와 같다.  용량이 크진 않으니 VS Code를 통해 C++ 코딩 작업을 할 경우, 잘 참고해서 하면 되겠다. 기본적으로 디버깅할땐 print문을 통해서 디버깅하는 방법이 있고, VS Code 상의 Debug Extention을 이용하는 방법이 있다. 전자는 직관적이지만, 귀찮고 후자는 효과적이지만 방법을 터득하기가 귀찮다. 일단 간단하게 Debugging 실습을 진행해보자. #include #include using namespace std;int main(){ list lst = {1,2,3,4,5}; // i want to practice using pop_back function in list! ..

금번 C++ 공부에선, Function Overloading 과 Templates 부분을 공부하고 관련 내용을 실습해보겠다.실습자료는 아래와 같다.  기본적으로 Function의 parameter에는 defulat 값을 넣을 수 있다.int divide( int a, int b = 2 ) { return a/b;} Function의 Overloading이란, Function들끼리 같은 이름을 Share하는데 Parameter type에 따라서 Return이 달라지는 것이다. 이 때, Return type만 가지고는 Function들 끼리 overload 할 수 없다. 다음은, Function Overload의 예시다. 보면, mySwap이라는 함수가 있는데, 이름이 다 같아도 input data의 typ..

https://leetcode.com/problems/maximum-employees-to-be-invited-to-a-meeting/description/?envType=daily-question&envId=2025-01-26A company is organizing a meeting and has a list of n employees, waiting to be invited. They have arranged for a large circular table, capable of seating any number of employees.The employees are numbered from 0 to n - 1. Each employee has a favorite person and they will..

https://leetcode.com/problems/first-completely-painted-row-or-column/description/?envType=daily-question&envId=2025-01-20You are given a 0-indexed integer array arr, and an m x n integer matrix mat. arr and mat both contain all the integers in the range [1, m * n].Go through each index i in arr starting from index 0 and paint the cell in mat containing the integer arr[i].Return the smallest inde..

https://leetcode.com/problems/shifting-letters/description/You are given a string s of lowercase English letters and an integer array shifts of the same length.Call the shift() of a letter, the next letter in the alphabet, (wrapping around so that 'z' becomes 'a').For example, shift('a') = 'b', shift('t') = 'u', and shift('z') = 'a'.Now for each shifts[i] = x, we want to shift the first i + 1 le..

https://leetcode.com/problems/number-of-music-playlists/description/ Your music player contains n different songs. You want to listen to goal songs (not necessarily different) during your trip. To avoid boredom, you will create a playlist so that:Every song is played at least once.A song can only be played again only if k other songs have been played.Given n, goal, and k, return the number of po..

https://leetcode.com/problems/linked-list-components/description/You are given the head of a linked list containing unique integer values and an integer array nums that is a subset of the linked list values.Return the number of connected components in nums where two values are connected if they appear consecutively in the linked list. Example 1:Input: head = [0,1,2,3], nums = [0,1,3]Output: 2Exp..