[20250203] BOJ / 골드4 / 방사형 그래 / 이강현

lkhyun/202502/03 BOJ 방사형 그래프 이강현.md

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+```java
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.util.*;
+public class Main {
+    static BufferedReader br;
+    static BufferedWriter bw;
+    static int[] comb = new int[8];
+    static boolean[] visited = new boolean[8];
+    static int[] points = new int[8];
+    static int count = 0;
+    public static void main(String[] args) throws Exception {
+        br = new BufferedReader(new InputStreamReader(System.in));
+        bw = new BufferedWriter(new OutputStreamWriter(System.out));
+        StringTokenizer st = new StringTokenizer(br.readLine());
+        for(int i=0;i<8;i++){
+            points[i] = Integer.parseInt(st.nextToken());
+        }
+        combination(0);
+        bw.write(count+"");
+        bw.flush();
+    }
+    public static void combination(int depth){
+        if(depth==8){
+            for(int i=0;i<8;i++){
+                if(omok(i)){return;}
+            }
+            count++;
+            return;
+        }
+
+        for(int j=0;j<8;j++){
+            if(visited[j]){continue;}
+            visited[j] = true;
+            comb[depth] = points[j];
+            combination(depth+1);
+            visited[j] = false;
+        }
+    }
+    public static boolean omok(int curpoint){
+        double prev = (double)comb[(curpoint+7)%8];
+        double next = (double)comb[(curpoint+1)%8];
+        double slope = prev/next + 1;
+        double distance = (prev / slope) * Math.sqrt(2);
+        if(comb[curpoint] < distance){return true;}
+        return false;
+    }
+}
+```