[20260219] BOJ / G4 / 미친 로봇 / 이준희

JHLEE325/202602/19 BOJ G4 미친 로봇.md

@@ -0,0 +1,49 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+
+    static int N;
+    static double[] probs = new double[4];
+    static boolean[][] visited = new boolean[30][30];
+    static int[] dr = {0, 0, 1, -1};
+    static int[] dc = {1, -1, 0, 0};
+    static double totalProb = 0;
+
+    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());
+        for (int i = 0; i < 4; i++) {
+            probs[i] = Integer.parseInt(st.nextToken()) * 0.01;
+        }
+
+        visited[15][15] = true;
+        dfs(15, 15, 0, 1.0);
+
+        System.out.println(totalProb);
+    }
+
+    static void dfs(int r, int c, int cnt, double currentProb) {
+        if (cnt == N) {
+            totalProb += currentProb;
+            return;
+        }
+
+        for (int i = 0; i < 4; i++) {
+            if (probs[i] == 0) continue;
+
+            int nr = r + dr[i];
+            int nc = c + dc[i];
+
+            if (!visited[nr][nc]) {
+                visited[nr][nc] = true;
+                dfs(nr, nc, cnt + 1, currentProb * probs[i]);
+                visited[nr][nc] = false;
+            }
+        }
+    }
+}
+```