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test15653.java
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143 lines (125 loc) · 3.4 KB
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https://velog.io/@hyeon930/BOJ-15653-%EA%B5%AC%EC%8A%AC-%ED%83%88%EC%B6%9C4-Java
// https://www.acmicpc.net/problem/15653
package org.tryAgain;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.LinkedList;
import java.util.Queue;
import java.util.StringTokenizer;
public class test15653 {
static class Node {
int r, c, time;
char type;
Node(int r, int c, char type, int time) {
this.r = r;
this.c = c;
this.type = type;
this.time = time;
}
}
static Queue<Node> q;
static boolean[][][][] visited;
static int[][] dir = {{-1, 0}, {1, 0}, {0, -1}, {0, 1}};
static char[][] map;
static int blueR, blueC, redR, redC;
static int N, M;
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer st = new StringTokenizer(br.readLine());
N = Integer.parseInt(st.nextToken());
M = Integer.parseInt(st.nextToken());
q = new LinkedList<>();
visited = new boolean[N][M][N][M];
map = new char[N][M];
for(int r = 0 ; r < N ; ++r) {
char[] line = br.readLine().toCharArray();
for(int c = 0 ; c < M ; ++c) {
if(line[c] == 'R') {
map[r][c] = '.';
redR = r;
redC= c;
q.offer(new Node(r, c, line[c], 0));
} else if(line[c] == 'B') {
map[r][c] = '.';
blueR = r;
blueC = c;
q.offer(new Node(r, c, line[c], 0));
}else {
map[r][c] = line[c];
}
}
}
visited[redR][redC][blueR][blueC] = true;
System.out.println(bfs());
}
private static int bfs() {
while(!q.isEmpty()) {
Node blue, red;
if(q.peek().type == 'B') {
blue = q.poll();
red = q.poll();
} else {
red = q.poll();
blue = q.poll();
}
boolean blueInHole, redInHole, afterRed;
int bcr, bcc, rcr, rcc;
int bnr, bnc, rnr, rnc;
for(int d = 0 ; d < 4 ; ++d) {
blueInHole = redInHole = afterRed = false;
bcr = blue.r;
bcc = blue.c;
rcr = red.r;
rcc = red.c;
// 파랑 구슬 이동
while(true) {
bnr = bcr + dir[d][0];
bnc = bcc + dir[d][1];
if(bnr == rcr && bnc == rcc) afterRed = true;
if(map[bnr][bnc] == '#') break;
if(map[bnr][bnc] == 'O') {
blueInHole = true;
break;
}
bcr = bnr;
bcc = bnc;
}
// 빨강 구슬 이동
while(true) {
rnr = rcr + dir[d][0];
rnc = rcc + dir[d][1];
if(map[rnr][rnc] == '#') break;
if(map[rnr][rnc] == 'O') {
redInHole = true;
break;
}
rcr = rnr;
rcc = rnc;
}
// 파란구슬이 들어갔을 때
if(blueInHole) continue;
// 빨간구슬이 들어갔을 때
if(redInHole) return red.time + 1;
// 구슬이 겹쳤을 때
if(bcr == rcr && bcc == rcc) {
// 빨간구슬 다음에 파란구슬이 올 때
if(afterRed) {
bcr -= dir[d][0];
bcc -= dir[d][1];
// 파란구슬 다음에 빨간구슬이 올 때
} else {
rcr -= dir[d][0];
rcc -= dir[d][1];
}
}
// 방문체크
if(visited[rcr][rcc][bcr][bcc]) continue;
visited[rcr][rcc][bcr][bcc] = true;
q.offer(new Node(bcr, bcc, 'B', blue.time + 1));
q.offer(new Node(rcr, rcc, 'R', red.time + 1));
}
}
return -1;
}
}