From fc2f5d1bf3f5697ed318fc6f16355ea751fd1b86 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=ED=95=98=EB=8F=99=EC=A4=80?=
 <77885587+djh0211@users.noreply.github.com>
Date: Fri, 5 Apr 2024 08:40:40 +0900
Subject: [PATCH 1/4] =?UTF-8?q?Create=2024040boj=5F17141=5F=EC=97=B0?=
 =?UTF-8?q?=EA=B5=AC=EC=86=8C2?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 ...141_\354\227\260\352\265\254\354\206\2142" | 109 ++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 "\355\225\230\353\217\231\354\244\200/24040boj_17141_\354\227\260\352\265\254\354\206\2142"

diff --git "a/\355\225\230\353\217\231\354\244\200/24040boj_17141_\354\227\260\352\265\254\354\206\2142" "b/\355\225\230\353\217\231\354\244\200/24040boj_17141_\354\227\260\352\265\254\354\206\2142"
new file mode 100644
index 0000000..3cd221d
--- /dev/null
+++ "b/\355\225\230\353\217\231\354\244\200/24040boj_17141_\354\227\260\352\265\254\354\206\2142"
@@ -0,0 +1,109 @@
+import java.util.*;
+import java.io.*;
+
+public class Main {
+    //연구소 위치 관련 클래스
+    static class position{
+        int x, y;
+        public position(int x, int y) {
+            this.x = x;
+            this.y = y;
+        }
+    }
+    static int N,M, answer = Integer.MAX_VALUE;
+    static int[][] laboratory;	//연구실 정보 저장 배열
+    static position[] route;	//M개 선택된 바이러스 위치 저장 배열
+    static int[] dx = {0, 0, -1, 1};	//상하좌우 x 변경값
+    static int[] dy = {-1, 1, 0, 0};	//상하좌우 y 변경값
+    static ArrayList<position> virus = new ArrayList<>();	//바이러스 위치 저장 리스트
+    public static void main(String[] args) throws IOException {
+        //입력값 처리하는 BufferedReader
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        //결과값 출력하는 BufferedWriter
+        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+        StringTokenizer st = new StringTokenizer(br.readLine()," ");
+        N = Integer.parseInt(st.nextToken());
+        M = Integer.parseInt(st.nextToken());
+        laboratory = new int[N][N];
+        //1. 입력되는 연구소의 정보에서 바이러스의 위치를 저장합니다.
+        for(int i=0;i<N;i++){
+            st = new StringTokenizer(br.readLine()," ");
+            for(int j=0;j<N;j++){
+                laboratory[i][j] = Integer.parseInt(st.nextToken());
+                if(laboratory[i][j] == 2)
+                    virus.add(new position(j, i));
+            }
+        }
+        route = new position[M];
+        //2. 모든 바이러스에서 M개의 바이러스를 선택합니다.
+        search(0, 0);
+        //4. 모든 바이러스의 경우에 소요되는 요일에 최소 값을 결과로 출력합니다.
+        if(answer == Integer.MAX_VALUE)	//모든 칸을 바이러스로 감염 실패시
+            bw.write("-1");
+        else		//모든 칸 바이러스 감염 성공시 최소 요일 BufferedWriter 저장
+            bw.write(answer + "");
+        bw.flush();		//결과 출력
+        bw.close();
+        br.close();
+    }
+    //M개의 바이러스를 선택하는 재귀 함수
+    static void search(int count, int start){
+        //3. 선택한 바이러스에 대하여 BFS탐색으로 문제에 목표에 만족하는 요일을 구합니다.
+        if(count == M){
+            bfs();
+            return;
+        }
+        for(int i=start;i<virus.size();i++){
+            route[count] = virus.get(i);
+            search(count+1, i+1);
+        }
+    }
+    //M개의 선택된 바이러스 기준 BFS탐색으로 바이러스 감염 및 걸리는 요일 구하는 함수
+    static void bfs(){
+        Queue<position> queue = new LinkedList<>();
+        boolean[][] visited = new boolean[N][N];
+        int result = 0;
+        for(int i=0;i<M;i++){
+            visited[route[i].y][route[i].x] = true;
+            queue.add(route[i]);
+        }
+        while(!queue.isEmpty()){
+            if(result >= answer)
+                return;
+            int size = queue.size();
+            for(int i=0;i<size;i++){
+                position cur = queue.poll();
+                //바이러스 인접한 칸 탐색
+                for(int j=0;j<4;j++){
+                    int tempX = cur.x + dx[j];
+                    int tempY = cur.y + dy[j];
+                    if(inLaboratory(tempX,tempY) && !visited[tempY][tempX]){
+                        if(laboratory[tempY][tempX] != 1){
+                            visited[tempY][tempX] = true;
+                            queue.add(new position(tempX, tempY));
+                        }
+                    }
+                }
+            }
+            result++;	//요일 증가
+        }
+        if(laboratoryCheck(visited))	//모든 칸이 감염되었을 때
+            answer = Math.min(answer, result-1);
+    }
+    //모든 연구소 칸이 감염되었는지 확인하는 함수
+    static boolean laboratoryCheck(boolean[][] visited){
+        for(int i=0;i<N;i++){
+            for(int j=0;j<N;j++){
+                if(laboratory[i][j] != 1 && !visited[i][j])
+                    return false;
+            }
+        }
+        return true;
+    }
+    //이동한 칸이 연구소 안에 존재하는지 확인하는 함수
+    static boolean inLaboratory(int x, int y){
+        if(x>=0 && y>=0 && x<N && y<N)
+            return true;
+        return false;
+    }
+}

From 7f1bada19ed9019e920dd4daa862620b8b63595c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=ED=95=98=EB=8F=99=EC=A4=80?=
 <77885587+djh0211@users.noreply.github.com>
Date: Fri, 5 Apr 2024 08:41:30 +0900
Subject: [PATCH 2/4] =?UTF-8?q?Rename=20=ED=95=98=EB=8F=99=EC=A4=80/24040b?=
 =?UTF-8?q?oj=5F17141=5F=EC=97=B0=EA=B5=AC=EC=86=8C2=20to=20=ED=95=98?=
 =?UTF-8?q?=EB=8F=99=EC=A4=80/240405/boj=5F17141=5F=EC=97=B0=EA=B5=AC?=
 =?UTF-8?q?=EC=86=8C2?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../240405/boj_17141_\354\227\260\352\265\254\354\206\2142"       | 0
 1 file changed, 0 insertions(+), 0 deletions(-)
 rename "\355\225\230\353\217\231\354\244\200/24040boj_17141_\354\227\260\352\265\254\354\206\2142" => "\355\225\230\353\217\231\354\244\200/240405/boj_17141_\354\227\260\352\265\254\354\206\2142" (100%)

diff --git "a/\355\225\230\353\217\231\354\244\200/24040boj_17141_\354\227\260\352\265\254\354\206\2142" "b/\355\225\230\353\217\231\354\244\200/240405/boj_17141_\354\227\260\352\265\254\354\206\2142"
similarity index 100%
rename from "\355\225\230\353\217\231\354\244\200/24040boj_17141_\354\227\260\352\265\254\354\206\2142"
rename to "\355\225\230\353\217\231\354\244\200/240405/boj_17141_\354\227\260\352\265\254\354\206\2142"

From 6fdc99684ea3ca783f7453b84ee0b8dd6df97f3f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=ED=95=98=EB=8F=99=EC=A4=80?=
 <77885587+djh0211@users.noreply.github.com>
Date: Fri, 5 Apr 2024 08:41:49 +0900
Subject: [PATCH 3/4] =?UTF-8?q?Rename=20boj=5F17141=5F=EC=97=B0=EA=B5=AC?=
 =?UTF-8?q?=EC=86=8C2=20to=20boj=5F17141=5F=EC=97=B0=EA=B5=AC=EC=86=8C2.ja?=
 =?UTF-8?q?va?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../240405/boj_17141_\354\227\260\352\265\254\354\206\2142.java"  | 0
 1 file changed, 0 insertions(+), 0 deletions(-)
 rename "\355\225\230\353\217\231\354\244\200/240405/boj_17141_\354\227\260\352\265\254\354\206\2142" => "\355\225\230\353\217\231\354\244\200/240405/boj_17141_\354\227\260\352\265\254\354\206\2142.java" (100%)

diff --git "a/\355\225\230\353\217\231\354\244\200/240405/boj_17141_\354\227\260\352\265\254\354\206\2142" "b/\355\225\230\353\217\231\354\244\200/240405/boj_17141_\354\227\260\352\265\254\354\206\2142.java"
similarity index 100%
rename from "\355\225\230\353\217\231\354\244\200/240405/boj_17141_\354\227\260\352\265\254\354\206\2142"
rename to "\355\225\230\353\217\231\354\244\200/240405/boj_17141_\354\227\260\352\265\254\354\206\2142.java"

From ff079d8fc7cb6e935bebbc76ab2928816da8c333 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=ED=95=98=EB=8F=99=EC=A4=80?=
 <77885587+djh0211@users.noreply.github.com>
Date: Fri, 5 Apr 2024 08:43:28 +0900
Subject: [PATCH 4/4] =?UTF-8?q?Create=20boj=5F6209=5F=EC=A0=9C=EC=B0=A8?=
 =?UTF-8?q?=EB=A6=AC=EB=A9=80=EB=A6=AC=EB=9B=B0=EA=B8=B0.java?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 ...\353\246\254\353\233\260\352\270\260.java" | 53 +++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 "\355\225\230\353\217\231\354\244\200/240405/boj_6209_\354\240\234\354\260\250\353\246\254\353\251\200\353\246\254\353\233\260\352\270\260.java"

diff --git "a/\355\225\230\353\217\231\354\244\200/240405/boj_6209_\354\240\234\354\260\250\353\246\254\353\251\200\353\246\254\353\233\260\352\270\260.java" "b/\355\225\230\353\217\231\354\244\200/240405/boj_6209_\354\240\234\354\260\250\353\246\254\353\251\200\353\246\254\353\233\260\352\270\260.java"
new file mode 100644
index 0000000..1fa1092
--- /dev/null
+++ "b/\355\225\230\353\217\231\354\244\200/240405/boj_6209_\354\240\234\354\260\250\353\246\254\353\251\200\353\246\254\353\233\260\352\270\260.java"
@@ -0,0 +1,53 @@
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.StringTokenizer;
+
+public class Main {
+    static int d,n,m;
+    static List<Integer> array;
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st = new StringTokenizer(br.readLine());
+        d = Integer.parseInt(st.nextToken());
+        n = Integer.parseInt(st.nextToken());
+        m = Integer.parseInt(st.nextToken());
+
+        array = new ArrayList<>();
+        for (int i = 0; i < n; i++) {
+            array.add(Integer.parseInt(br.readLine()));
+        }
+        array.add(0);
+        array.add(d);
+        Collections.sort(array);
+
+        int left = 0;
+        int right = d;
+        int result = 0;
+
+        while (left<=right) {
+            int mid = (left+right)/2;
+            int now = 0;
+            int sum = 0;
+            for (int i = 1; i < array.size(); i++) {
+                if (array.get(i) - array.get(now) < mid) {
+                    // 생각한거보다 짧음. 얘는 없애도 돼
+                    sum++;
+                }
+                else now=i;
+            }
+            if (sum > m) {
+                // 너무 없앰. 조금 줄여
+                right = mid - 1;
+            } else {
+                result = mid;
+                left = mid + 1;
+            }
+        }
+
+        System.out.println(result);
+    }
+
+}