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[9주차] 고다혜 #118
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[9주차] 고다혜 #118
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a529e83
고다혜: [CT] 전투로봇_241104
KodaHye 62d75ab
고다혜: [PG] 64062 징검다리 건너기_241104
KodaHye aa64bf4
Merge branch 'GreatAlgorithm-Study:main' into main
KodaHye ddbf9d1
Merge branch 'GreatAlgorithm-Study:main' into main
KodaHye cc2e04b
고다혜: [BOJ] 2660 회장뽑기_241105
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import java.io.*; | ||
import java.util.*; | ||
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/* | ||
* 회장뽑기 | ||
*/ | ||
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public class DH_2660 { | ||
static int N, maxDepth; | ||
static ArrayList<Integer> adj[]; | ||
static ArrayDeque<int []> q; | ||
static boolean[] v; | ||
static int[] depth; // 각 회원마다 끝까지 탐색했을 때 depth를 저장할 변수 | ||
static TreeSet<Integer> set; // 회장이 될 수 있는 사람의 번호를 담음 | ||
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public static void main(String[] args) throws Exception { | ||
initInput(); | ||
solution(); | ||
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StringBuilder sb = new StringBuilder(); | ||
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sb.append(maxDepth).append(" ").append(set.size()).append("\n"); | ||
for(int i: set) sb.append(i).append(" "); | ||
System.out.println(sb); | ||
} | ||
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static void solution() { | ||
for(int i = 1; i < adj.length; i++) { | ||
v = new boolean[N + 1]; | ||
q.add(new int[] {i, 0}); // [0]: 학생 번호, [1]: depth 깊이 | ||
v[i] = true; | ||
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while(!q.isEmpty()) { | ||
int[] current = q.poll(); | ||
depth[i] = current[1]; | ||
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for(int next: adj[current[0]]) { | ||
if(v[next]) continue; | ||
q.add(new int[] {next, current[1] + 1}); | ||
v[next] = true; | ||
} | ||
} | ||
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if(depth[i] < maxDepth) { // maxDepth 깊이가 작아야 점수가 작아지기 때문에 | ||
maxDepth = depth[i]; | ||
set.clear(); | ||
} | ||
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if(depth[i] == maxDepth) set.add(i); | ||
} | ||
} | ||
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static void initInput() throws Exception { | ||
System.setIn(new FileInputStream("../AlgorithmStudy/input/BOJ2660.txt")); | ||
BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); | ||
StringTokenizer st; | ||
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q = new ArrayDeque<>(); | ||
set = new TreeSet<Integer>(); | ||
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maxDepth = Integer.MAX_VALUE; | ||
N = Integer.parseInt(br.readLine()); | ||
adj = new ArrayList[N + 1]; | ||
for(int i = 0; i < adj.length; i++) adj[i] = new ArrayList<Integer>(); | ||
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depth = new int[N + 1]; | ||
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String s; | ||
while(!(s = br.readLine()).equals("-1 -1")) { | ||
st = new StringTokenizer(s); | ||
int a = Integer.parseInt(st.nextToken()); | ||
int b = Integer.parseInt(st.nextToken()); | ||
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adj[a].add(b); | ||
adj[b].add(a); | ||
} | ||
} | ||
} |
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import java.io.*; | ||
import java.util.*; | ||
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public class DH_전투로봇 { | ||
static class Point { | ||
int r, c; | ||
public Point(int r, int c) { | ||
this.r = r; | ||
this.c = c; | ||
} | ||
} | ||
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static class qPoint implements Comparable<qPoint> { | ||
Point p; | ||
int d; | ||
public qPoint(Point p, int d) { | ||
this.p = p; | ||
this.d = d; | ||
} | ||
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@Override | ||
public int compareTo(qPoint o) { | ||
if(this.d == o.d) { | ||
if(this.p.r == o.p.r) return Integer.compare(this.p.c, o.p.c); // 열 오름차순 | ||
return Integer.compare(this.p.r, o.p.r); // 행 오름차순s | ||
} | ||
return Integer.compare(this.d, o.d); // 거리 오름차순 | ||
} | ||
} | ||
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static int[] dr = {-1, 1, 0, 0}, dc = {0, 0, -1, 1}; | ||
static int N, dieMonsterCnt, totalTime; | ||
static int[][] levelMap, monsterIdxMap; | ||
static Point robot; | ||
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public static void main(String[] args) throws Exception { | ||
initInput(); | ||
solution(); | ||
} | ||
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static void solution() { | ||
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int time; | ||
while((time = bfs()) != 0) { | ||
totalTime += time; | ||
} | ||
System.out.println(totalTime); | ||
} | ||
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static int bfs() { | ||
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PriorityQueue<qPoint> q = new PriorityQueue<>(); | ||
boolean[][] v = new boolean[N][N]; | ||
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q.add(new qPoint(robot, 0)); | ||
v[robot.r][robot.c] = true; | ||
int robotLevel = levelMap[robot.r][robot.c]; | ||
levelMap[robot.r][robot.c] = 0; | ||
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// 없앨 수 있는 몬스터 정보 구하기 | ||
while(!q.isEmpty()) { | ||
qPoint current = q.poll(); | ||
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// 몬스터를 없앨 수 있다면 | ||
if(canKillMonster(current.p, robotLevel)) { | ||
// 몬스터 없앤 개수 늘리기 | ||
dieMonsterCnt++; | ||
// 없앤 몬스터의 개수와 로봇의 레벨이 같다면 | ||
if(dieMonsterCnt == robotLevel) { | ||
// 로봇의 레벨 늘려주기 | ||
dieMonsterCnt = 0; | ||
robotLevel++; | ||
} | ||
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// map에 있는 몬스터의 정보 없애주기 | ||
levelMap[current.p.r][current.p.c] = 0; | ||
monsterIdxMap[current.p.r][current.p.c] = 0; | ||
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// 로봇 위치, map에 로봇 정보 갱신하기 | ||
robot.r = current.p.r; | ||
robot.c = current.p.c; | ||
levelMap[current.p.r][current.p.c] = robotLevel; | ||
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// 로봇이 이동한 위치 반환 | ||
return current.d; | ||
} | ||
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for(int d = 0; d < 4; d++) { | ||
int nr = current.p.r + dr[d]; | ||
int nc = current.p.c + dc[d]; | ||
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// 범위를 벗어나거나 || 이미 방문했던 곳이거나 || 자신의 레벨보다 큰 몬스터가 있거나 | ||
if(!check(nr, nc) || v[nr][nc] || levelMap[nr][nc] > robotLevel) continue; | ||
q.add(new qPoint(new Point(nr, nc), current.d + 1)); | ||
v[nr][nc] = true; | ||
} | ||
} | ||
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// 몬스터를 해치우지 못한 경우 | ||
return 0; | ||
} | ||
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static boolean canKillMonster(Point current, int robotLevel) { | ||
int monsterLevel = levelMap[current.r][current.c]; | ||
return 0 < monsterLevel && monsterLevel < robotLevel; | ||
} | ||
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static boolean check(int r, int c) { | ||
return 0 <= r && r < N && 0 <= c && c < N; | ||
} | ||
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static void initInput() throws Exception { | ||
System.setIn(new FileInputStream("../AlgorithmStudy/input/전투로봇.txt")); | ||
BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); | ||
StringTokenizer st; | ||
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N = Integer.parseInt(br.readLine()); | ||
levelMap = new int[N][N]; | ||
monsterIdxMap = new int[N][N]; | ||
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int idx = 1; | ||
for(int r = 0; r < N; r++) { | ||
st = new StringTokenizer(br.readLine()); | ||
for(int c = 0; c < N; c++) { | ||
levelMap[r][c] = Integer.parseInt(st.nextToken()); | ||
if(levelMap[r][c] == 9) { | ||
robot = new Point(r, c); | ||
levelMap[r][c] = 2; // 전투로봇의 초기 레벨: 2 | ||
} | ||
else if(levelMap[r][c] != 0) { | ||
monsterIdxMap[r][c] = idx; | ||
} | ||
} | ||
} | ||
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// printRobotInfo(); | ||
// printlevelMapInfo(); | ||
// printMostersInfo(); | ||
} | ||
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static void printRobotInfo() { | ||
System.out.println("robotInfo: " + robot.toString() + ", level: " + levelMap[robot.r][robot.c]); | ||
} | ||
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static void printlevelMapInfo() { | ||
for(int r = 0; r < N; r++) { | ||
System.out.println(Arrays.toString(levelMap[r])); | ||
} | ||
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System.out.println(); | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,39 @@ | ||
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/* | ||
* 징검다리 건너기 | ||
*/ | ||
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public class DH_64062 { | ||
static int solution(int[] stones, int k) { | ||
// 돌을 건넌 사람의 최대 수 구하기 - upper bound 구하기 | ||
int s = 0, e = 200_000_001; | ||
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while(s <= e) { | ||
// 돌을 건넌 친구 수 | ||
int m = (s + e) / 2; | ||
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int cnt = 0; | ||
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// 친구들이 모두 길을 건넜을 때 | ||
// 값이 0이하가 되는 곳이 k개 이상이 된다면 못건너감 | ||
boolean canGo = true; | ||
for(int stone: stones) { | ||
if(stone - m < 0) cnt++; | ||
else cnt = 0; | ||
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if(cnt >= k) canGo = false; | ||
} | ||
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if(canGo) s = m + 1; | ||
else e = m - 1; | ||
} | ||
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return e; | ||
} | ||
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public static void main(String[] args) { | ||
int[] stones = {2, 4, 5, 3, 2, 1, 4, 2, 5, 1}; | ||
int k = 3; | ||
System.out.println(solution(stones, k)); | ||
} | ||
} |
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애초에 큐를 우선순위큐로 하면 가장 먼저 찾은 몬스터를 없애면 되는군요!! 👍 효율적인 코드 배워갑니다!