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고다혜: [BOJ] 18513 샘터_250325
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BOJ/15001-20000번/DH_18513.java

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import java.io.*;
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import java.util.*;
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/*
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* 샘터
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* 주의점
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* 1. 샘터의 위치는 -100_000_000 ~ 100_000_000이지만, 집의 위치는 이걸 벗어날 수 있음
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* 2. 불행도를 계산할 때, 불행도의 범위 long으로 설정하기
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* - 1 + 2 + ... + 500,000 = 125,000,250,000
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*/
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public class DH_18513 {
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static final int INF = 100_200_000;
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public static void main(String[] args) throws Exception {
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BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
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StringTokenizer st = new StringTokenizer(br.readLine());
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int N = Integer.parseInt(st.nextToken()); // 샘터의 개수
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int K = Integer.parseInt(st.nextToken()); // 집의 개수
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boolean[] v = new boolean[2 * INF + 1]; // -INF ~ INF
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Queue<int[]> q = new ArrayDeque<int[]>();
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st = new StringTokenizer(br.readLine()); // 샘터에 대한 정보
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for(int i = 0; i < N; i++) {
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int current = Integer.parseInt(st.nextToken());
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q.add(new int[] {current, 0});
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v[current + INF] = true;
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}
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int cnt = 0;
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int badCnt = 0;
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L: while(!q.isEmpty()) {
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int[] current = q.poll();
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// 좌, 우 확인하기
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for(int d = -1; d < 2; d += 2) {
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int next = current[0] + d;
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if(next < -INF || next > INF || v[next + INF]) continue;
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cnt += 1;
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badCnt += current[1] + 1;
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if(cnt ==K) break L;
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q.add(new int[] {next, current[1] + 1});
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v[next + INF] = true;
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}
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}
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System.out.println(badCnt);
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}
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}

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