[20250205] BOJ / 골드3 / 지금 만나러 갑니다 / 권혁준

Author: oncsr

khj20006/202502/05 BOJ G3 지금 만나러 갑니다.md

@@ -0,0 +1,59 @@
+```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;
+
+	static void nextLine() throws Exception {st = new StringTokenizer(br.readLine());}
+	static int nextInt() {return Integer.parseInt(st.nextToken());}
+	static long nextLong() {return Long.parseLong(st.nextToken());}
+	static void bwEnd() throws Exception {bw.flush();bw.close();}
+	
+	// Additional field
+	
+
+	
+	public static void main(String[] args) throws Exception {
+
+		nextLine();
+		int N = nextInt(), A = nextInt(), B = nextInt();
+		boolean[][] D = new boolean[N+1][2];
+		D[A][0] = true;
+		D[B][1] = true;
+		
+		for(int k=1;k<=20;k++) {
+			int d = 1<<(k-1);
+			boolean[][] ND = new boolean[N+1][2];
+			for(int i=1;i<=N;i++) {
+				for(int j=0;j<2;j++) if(D[i][j]) {
+					if(i-d > 0) ND[i-d][j] = true;
+					if(i+d <= N) ND[i+d][j] = true;					
+				}
+			}
+			for(int i=1;i<=N;i++) {
+				D[i][0] = ND[i][0];
+				D[i][1] = ND[i][1];
+				if(D[i][0] && D[i][1]) {
+					bw.write(k+"\n");
+					bwEnd();
+					return;
+				}
+			}
+		}
+		
+		
+		
+		bw.write("-1");
+
+		bwEnd();
+	}
+
+}
+
+```