LeetCode #429 N-aryTreeLevelOrderTraversal. Algorithm,알고리즘,LeetCode,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive,datastructure,techinterview,coding,코딩인터뷰,기술면접
문제풀이 설계가 헷갈려서 좀 걸리고 코딩은 금방 끝냄, input 이 null 인 케이스에서 런타임 에러나는걸 다른건줄 알고 삽질 잠깐함
성능은 중간정도 가고, 메모리는 좋지않음. 트리구조랑 재귀 간만에 해서 재밌었음
Spent a lil time to get how to solve, but did coding in a short time. A case input null, i was confused about that runtime error, so spent some time.
Performance is just middle, memory is not that good enough. Anyway, it was so fun to solve cuz it's been a long time to see recursive and tree.
LeetCode #429
Q.
Given an n-ary tree, return the level order traversal of its nodes' values. (ie, from left to right, level by level).
주어진 n 개짜리 트리구조에서, 각 층의 노드 값들을 반환해라. (왼쪽부터 오른쪽으로 층 순서대로)
e.g.
Example:
given a 3-ary tree:
We should return its level order traversal:
[
[1],
[3,2,4],
[5,6]
]
Process
// Process
//1. Input root node
//2. Call recursiveFunction
//3. Return resultVector
// recursiveFunction
//1. Input node, resultVector, level
//2. Add level
//3. Check if resultVector has that level vector
// 3.1. If not -> make new vector and pushBack
// 3.2. If so -> add node val
//4. Iterate children of node from begin to the end
// 4.1. Call recursive
//5. Subtract level
// 처리과정
//1. 루트노드를 입력받는다.
//2. 재귀함수를 호출한다.
//3. 결과 배열을 반환한다.
// 재귀함수
//1. 노드, 결과배열, 층(레벨) 을 입력받는다.
//2. 층을 더한다.
//3. 결과배열에 해당 층 벡터가 있는지 확인해서
// 3.1. 없으면 -> 만들어서 추가해준다.
// 3.2. 있으면 -> 값을 넣어준다.
//4. 노드의 하위노드에서 전체 반복한다.
// 4.1. 재귀함수 호출한다.
//5. 층을 빼서 돌아간다.
Code.. lemme see example code!!!
코드.. 예제코드를 보자!!!
#include <vector>
#include <iostream>
using namespace std;
// Definition for a Node.
class Node {
public:
int val;
vector<Node*> children;
Node() {}
Node(int _val, vector<Node*> _children) {
val = _val;
children = _children;
}
};
class Solution {
public:
vector<vector<int>> levelOrder(Node* root) {
vector<vector<int>> resultVector;
int level = 0;
if (root != 0)
recursiveLevelOrderTraversal(root, &resultVector, &level);
return resultVector;
}
private:
void recursiveLevelOrderTraversal(Node* node, vector<vector<int>>* resultVector, int* level) {
++*level;
if (resultVector->size() < *level)
{
vector<int> *newVector = new vector<int>();
newVector->push_back(node->val);
resultVector->push_back(*newVector);
}
else
{
resultVector->at(*level - 1).push_back(node->val);
}
for (int i = 0; i < node->children.size(); ++i)
{
recursiveLevelOrderTraversal(node->children.at(i), resultVector, level);
}
--*level;
}
};
Something else you might like...?
2019/02/17 - [Algorithm/Leet Code] - LeetCode #415 AddStrings. Algorithm,알고리즘,LeetCode,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive,datastructure,techinterview,coding,코딩인터뷰,기술면접
2019/02/15 - [Algorithm/Leet Code] - LeetCode #290 WordPattern. Algorithm,알고리즘,LeetCode,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive,datastructure,techinterview,coding,코딩인터뷰,기술면접
2019/02/14 - [Algorithm/Leet Code] - LeetCode #283 MoveZeroes. Algorithm,알고리즘,LeetCode,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive,datastructure,techinterview,coding,코딩인터뷰,기술면접
2019/02/13 - [Algorithm/Leet Code] - LeetCode #258 AddDigits. Algorithm,알고리즘,LeetCode,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive,datastructure,techinterview,coding,코딩인터뷰,기술면접
2019/02/12 - [Algorithm/Leet Code] - LeetCode #136 SingleNumber. Algorithm,알고리즘,LeetCode,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive,datastructure,techinterview,coding,코딩인터뷰,기술면접
2019/02/10 - [Algorithm/Leet Code] - LeetCode #171 ExcelSheetColumnNumber. Algorithm,알고리즘,LeetCode,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive,datastructure,techinterview,coding,코딩인터뷰,기술면접
2019/02/09 - [Algorithm/Leet Code] - LeetCode #709 ToLowerCase. Algorithm,알고리즘,LeetCode,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive,datastructure,techinterview,coding,코딩인터뷰,기술면접
2019/02/08 - [Algorithm/Leet Code] - LeetCode #400 NthDigit. Algorithm,알고리즘,LeetCode,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive,datastructure,techinterview,coding,코딩인터뷰,기술면접
2019/02/03 - [Algorithm/Leet Code] - LeetCode #393 UTF-8 Validation. Algorithm,알고리즘,LeetCode,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive,datastructure,techinterview,coding,코딩인터뷰,기술면접
2019/02/03 - [Algorithm/Leet Code] - LeetCode #398 RandomPickIndex. Algorithm,알고리즘,LeetCode,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive,datastructure,techinterview,coding,코딩인터뷰,기술면접
2019/02/01 - [Algorithm/Leet Code] - LeetCode #905 SortArrayByParity. Algorithm,알고리즘,LeetCode,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive,datastructure,techinterview,coding,코딩인터뷰,기술면접
2019/01/31 - [Algorithm/Leet Code] - LeetCode #593 ValidSquare. Algorithm,알고리즘,LeetCode,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive,datastructure,techinterview,coding,코딩인터뷰,기술면접
2019/01/16 - [Algorithm/Leet Code] - LeetCode #217 ContainsDuplicate. Algorithm,알고리즘,LeetCode,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive,datastructure,techinterview,coding,코딩인터뷰,기술면접
2019/01/21 - [Algorithm/Leet Code] - LeetCode #219 ContainsDuplicate2. Algorithm,알고리즘,LeetCode,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive,datastructure,techinterview,coding,코딩인터뷰,기술면접
2019/01/22 - [Algorithm/Leet Code] - LeetCode #220 ContainsDuplicate3. Algorithm,알고리즘,LeetCode,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive,datastructure,techinterview,coding,코딩인터뷰,기술면접
2019/01/23 - [Algorithm/Leet Code] - LeetCode #225 ImplementStackUsingQueue. Algorithm,알고리즘,LeetCode,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive,datastructure,techinterview,coding,코딩인터뷰,기술면접
2018/10/19 - [Programming/Design Pattern ] - Design pattern - Prototype (디자인패턴 - 프로토타입) / Java C++ C#
2019/01/12 - [Algorithm/Code Fights (Code Signal)] - Aracade Intro #60 sudoku. Algorithm,알고리즘,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive
2019/01/12 - [Algorithm/Code Fights (Code Signal)] - Aracade Intro #59 spiralNumbers. Algorithm,알고리즘,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive
2019/01/08 - [Algorithm/Code Fights (Code Signal)] - Aracade Intro #58 messageFromBinaryCode. Algorithm,알고리즘,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive
2019/01/07 - [Algorithm/Code Fights (Code Signal)] - Aracade Intro #57 fileNaming. Algorithm,알고리즘,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive
2019/01/04 - [Algorithm/Code Fights (Code Signal)] - Aracade Intro #56 digitsProduct. Algorithm, 알고리즘, Codefights, CodeSignal, 코드파이트, 코드시그널, 예제,문제해결능력,example, c++ java c# scalar
2019/01/04 - [Algorithm/Code Fights (Code Signal)] - Aracade Intro #55 differentSquares. Algorithm, 알고리즘, Codefights, CodeSignal, 코드파이트, 코드시그널, 예제,문제해결능력,example, c++ java c# scalar
2018/12/28 - [Programming/Software Architecture] - Perfecting OO's Small Classes and Short Methods. 완벽한 객체지향의 작은 클래스와 짧은 메소드, Book:ThoughtWorks Anthology, Java,cpp,자바,oop,좋은코드,객체지향프로그래밍 - (#9, Tell, Don't Ask)
2018/12/26 - [Programming/Software Architecture] - Perfecting OO's Small Classes and Short Methods. 완벽한 객체지향의 작은 클래스와 짧은 메소드, Book:ThoughtWorks Anthology, Java,cpp,자바,oop,좋은코드,객체지향프로그래밍 (1)
2019/01/14 - [Programming/Java] - 자바 메모리 누수 체크/확인/고치는 방법, Memory leak check/fix in Java application, cleanCode/좋은코드/oop/객체지향
2019/01/25 - [Life/Health care] - L-Arginine 아르기닌 usage/side effects/dosage 효능/부작용/성인,소아 용법(3)
2018/12/16 - [Life/Health care] - L-Arginine 아르기닌 usage/side effects/dosage 효능/부작용/성인,소아 용법(2)
2018/12/27 - [Life/Health care] - Milk-Thistle 밀크시슬 usage/side effects/dosage/fatigue/supplement,효능/부작용/성인,소아 용법/건강/피로회복/영양제
2018/12/26 - [Life/Health care] - Selenium 셀레늄 usage/side effects/dosage 효능/부작용/성인,소아 용법