[20250320] BOJ / G3 / A Knightly Pursuit / 권혁준

khj20006/202503/20 BOJ G3 A Knightly Pursuit.md

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+```java
+
+import java.util.*;
+import java.io.*;
+
+class Main {
+
+	// IO field
+	static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+	static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+	static StringTokenizer st = new StringTokenizer("");
+
+	static void nextLine() throws Exception {st = new StringTokenizer(br.readLine());}
+	static String nextToken() throws Exception {
+		if(!st.hasMoreTokens()) nextLine();
+		return st.nextToken();
+	}
+	static int nextInt() throws Exception { return Integer.parseInt(nextToken()); }
+	static long nextLong() throws Exception { return Long.parseLong(nextToken()); }
+	static double nextDouble() throws Exception { return Double.parseDouble(nextToken()); }
+	static void bwEnd() throws Exception {bw.flush();bw.close();}
+
+	// Additional field
+
+	static int R, C;
+	static int pr, pc, kr, kc;
+
+	static int[] dx = {-2,-2,-1,-1,1,1,2,2};
+	static int[] dy = {-1,1,-2,2,-2,2,-1,1};
+
+	public static void main(String[] args) throws Exception {
+
+		for(int T=nextInt();T-->0;) {
+
+			ready();
+			solve();
+		}
+
+		bwEnd();
+
+	}
+
+	static void ready() throws Exception{
+
+		R = nextInt();
+		C = nextInt();
+		pr = nextInt();
+		pc = nextInt();
+		kr = nextInt();
+		kc = nextInt();
+
+	}
+
+	static void solve() throws Exception{
+
+		int[][] time = new int[R+1][C+1];
+		for(int i=1;i<=R;i++) Arrays.fill(time[i], -1);
+
+		time[kr][kc] = 0;
+		Queue<int[]> Q = new LinkedList<>();
+
+		int win = -1;
+		int stalemate = -1;
+		Q.offer(new int[] {kr,kc,0});
+		while(!Q.isEmpty()) {
+			int[] now = Q.poll();
+			int x = now[0], y = now[1], t = now[2];
+			if(y == pc) {
+				if(x<R && pr+t <= x && (x-pr-t)%2 == 0) {
+					if(win == -1) win = x-pr;
+					else win = Math.min(win, x-pr);
+				}
+				if(pr+t+1 <= x && (x-pr-t-1)%2 == 0) {
+					if(stalemate == -1) stalemate = x-pr-1;
+					else stalemate = Math.min(stalemate, x-pr-1);
+				}
+
+			}
+			for(int i=0;i<8;i++) {
+				int xx = x+dx[i], yy = y+dy[i];
+				if(xx<1 || xx>R || yy<1 || yy>C || time[xx][yy]!=-1) continue;
+				time[xx][yy] = t+1;
+				Q.offer(new int[] {xx,yy,t+1});
+			}
+		}
+		if(win != -1) bw.write("Win in " + Math.max(win, 0) + " knight move(s).\n");
+		else if(stalemate != -1) bw.write("Stalemate in " + stalemate + " knight move(s).\n");
+		else bw.write("Loss in " + Math.max(R-pr-1, 0) + " knight move(s).\n");
+
+	}
+
+}
+
+```