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[Gold V] Title: 집합의 표현, Time: 36 ms, Memory: 6328 KB -BaekjoonHub
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kunheekimkr committed Nov 17, 2023
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30 changes: 30 additions & 0 deletions 백준/Gold/1717. 집합의 표현/README.md
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# [Gold V] 집합의 표현 - 1717

[문제 링크](https://www.acmicpc.net/problem/1717)

### 성능 요약

메모리: 6328 KB, 시간: 36 ms

### 분류

자료 구조, 분리 집합

### 제출 일자

2023년 11월 17일 10:07:17

### 문제 설명

<p>초기에 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D45B TEX-I"></mjx-c></mjx-mi><mjx-mo class="mjx-n" space="3"><mjx-c class="mjx-c2B"></mjx-c></mjx-mo><mjx-mn class="mjx-n" space="3"><mjx-c class="mjx-c31"></mjx-c></mjx-mn></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>n</mi><mo>+</mo><mn>1</mn></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$n+1$</span></mjx-container>개의 집합 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mo class="mjx-n"><mjx-c class="mjx-c7B"></mjx-c></mjx-mo><mjx-mn class="mjx-n"><mjx-c class="mjx-c30"></mjx-c></mjx-mn><mjx-mo class="mjx-n"><mjx-c class="mjx-c7D"></mjx-c></mjx-mo><mjx-mo class="mjx-n"><mjx-c class="mjx-c2C"></mjx-c></mjx-mo><mjx-mo class="mjx-n" space="2"><mjx-c class="mjx-c7B"></mjx-c></mjx-mo><mjx-mn class="mjx-n"><mjx-c class="mjx-c31"></mjx-c></mjx-mn><mjx-mo class="mjx-n"><mjx-c class="mjx-c7D"></mjx-c></mjx-mo><mjx-mo class="mjx-n"><mjx-c class="mjx-c2C"></mjx-c></mjx-mo><mjx-mo class="mjx-n" space="2"><mjx-c class="mjx-c7B"></mjx-c></mjx-mo><mjx-mn class="mjx-n"><mjx-c class="mjx-c32"></mjx-c></mjx-mn><mjx-mo class="mjx-n"><mjx-c class="mjx-c7D"></mjx-c></mjx-mo><mjx-mo class="mjx-n"><mjx-c class="mjx-c2C"></mjx-c></mjx-mo><mjx-mo class="mjx-n" space="2"><mjx-c class="mjx-c2026"></mjx-c></mjx-mo><mjx-mo class="mjx-n" space="2"><mjx-c class="mjx-c2C"></mjx-c></mjx-mo><mjx-mo class="mjx-n" space="2"><mjx-c class="mjx-c7B"></mjx-c></mjx-mo><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D45B TEX-I"></mjx-c></mjx-mi><mjx-mo class="mjx-n"><mjx-c class="mjx-c7D"></mjx-c></mjx-mo></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mo fence="false" stretchy="false">{</mo><mn>0</mn><mo fence="false" stretchy="false">}</mo><mo>,</mo><mo fence="false" stretchy="false">{</mo><mn>1</mn><mo fence="false" stretchy="false">}</mo><mo>,</mo><mo fence="false" stretchy="false">{</mo><mn>2</mn><mo fence="false" stretchy="false">}</mo><mo>,</mo><mo>…</mo><mo>,</mo><mo fence="false" stretchy="false">{</mo><mi>n</mi><mo fence="false" stretchy="false">}</mo></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$\{0\}, \{1\}, \{2\}, \dots , \{n\}$</span></mjx-container>이 있다. 여기에 합집합 연산과, 두 원소가 같은 집합에 포함되어 있는지를 확인하는 연산을 수행하려고 한다.</p>

<p>집합을 표현하는 프로그램을 작성하시오.</p>

### 입력

<p>첫째 줄에 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D45B TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>n</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$n$</span></mjx-container>, <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D45A TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>m</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$m$</span></mjx-container>이 주어진다. <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D45A TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>m</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$m$</span></mjx-container>은 입력으로 주어지는 연산의 개수이다. 다음 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D45A TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>m</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$m$</span></mjx-container>개의 줄에는 각각의 연산이 주어진다. 합집합은 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mn class="mjx-n"><mjx-c class="mjx-c30"></mjx-c></mjx-mn></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mn>0</mn></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$0$</span></mjx-container> <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D44E TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>a</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$a$</span></mjx-container> <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D44F TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>b</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$b$</span></mjx-container>의 형태로 입력이 주어진다. 이는 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D44E TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>a</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$a$</span></mjx-container>가 포함되어 있는 집합과, <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D44F TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>b</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$b$</span></mjx-container>가 포함되어 있는 집합을 합친다는 의미이다. 두 원소가 같은 집합에 포함되어 있는지를 확인하는 연산은 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mn class="mjx-n"><mjx-c class="mjx-c31"></mjx-c></mjx-mn></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mn>1</mn></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$1$</span></mjx-container> <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D44E TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>a</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$a$</span></mjx-container> <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D44F TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>b</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$b$</span></mjx-container>의 형태로 입력이 주어진다. 이는 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D44E TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>a</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$a$</span></mjx-container>와 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D44F TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>b</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$b$</span></mjx-container>가 같은 집합에 포함되어 있는지를 확인하는 연산이다.</p>

### 출력

<p>1로 시작하는 입력에 대해서 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D44E TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>a</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$a$</span></mjx-container>와 <mjx-container class="MathJax" jax="CHTML" style="font-size: 109%; position: relative;"><mjx-math class="MJX-TEX" aria-hidden="true"><mjx-mi class="mjx-i"><mjx-c class="mjx-c1D44F TEX-I"></mjx-c></mjx-mi></mjx-math><mjx-assistive-mml unselectable="on" display="inline"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>b</mi></math></mjx-assistive-mml><span aria-hidden="true" class="no-mathjax mjx-copytext">$b$</span></mjx-container>가 같은 집합에 포함되어 있으면 "<code>YES</code>" 또는 "<code>yes</code>"를, 그렇지 않다면 "<code>NO</code>" 또는 "<code>no</code>"를 한 줄에 하나씩 출력한다.</p>

38 changes: 38 additions & 0 deletions 백준/Gold/1717. 집합의 표현/집합의 표현.cc
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#include <iostream>
using namespace std;
int parent[1000001];

int find_root(int a){
if (a == parent[a]) return a;
return parent[a] = find_root(parent[a]);
}

void union_tree(int a, int b) {
a = find_root(a);
b = find_root(b);
if (a!= b){
parent[a] = b;
}
}

int main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);

for (int i = 0; i < 1000001; i++)
parent[i] = i;

int n, m;
cin >> n >> m;

while(m--){
int op,a,b;
cin >> op >> a >> b;
if (op == 0) {
union_tree(a,b);
} else {
find_root(a) == find_root(b) ? cout << "YES\n" : cout << "NO\n";
}
}
}

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