[20250831] BOJ / G5 / 치킨 배달 / 이준희

JHLEE325/202508/31 BOJ G5 치킨 배달.md

@@ -0,0 +1,69 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    static int n, m, h, c;
+    static List<int[]> houses = new ArrayList<>();
+    static List<int[]> chickens = new ArrayList<>();
+    static int[][] dist;
+    static int[] pick;
+    static int answer = Integer.MAX_VALUE;
+
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st = new StringTokenizer(br.readLine());
+
+        n = Integer.parseInt(st.nextToken());
+        m = Integer.parseInt(st.nextToken());
+
+        for (int i = 0; i < n; i++) {
+            st = new StringTokenizer(br.readLine());
+            for (int j = 0; j < n; j++) {
+                int v = Integer.parseInt(st.nextToken());
+                if (v == 1) houses.add(new int[]{i, j});
+                else if (v == 2) chickens.add(new int[]{i, j});
+            }
+        }
+
+        h = houses.size();
+        c = chickens.size();
+
+        dist = new int[h][c];
+        for (int h = 0; h < Main.h; h++) {
+            int hx = houses.get(h)[0], hy = houses.get(h)[1];
+            for (int k = 0; k < Main.c; k++) {
+                int cx = chickens.get(k)[0], cy = chickens.get(k)[1];
+                dist[h][k] = Math.abs(hx - cx) + Math.abs(hy - cy);
+            }
+        }
+
+        pick = new int[m];
+        dfs(0, 0);
+
+        System.out.println(answer);
+    }
+
+    static void dfs(int start, int depth) {
+        if (depth == m) {
+            int sum = 0;
+            for (int h = 0; h < Main.h; h++) {
+                int best = Integer.MAX_VALUE;
+                for (int p = 0; p < m; p++) {
+                    best = Math.min(best, dist[h][pick[p]]);
+                }
+                sum += best;
+                if (sum >= answer) return;
+            }
+            answer = Math.min(answer, sum);
+            return;
+        }
+
+        for (int i = start; i < c; i++) {
+            pick[depth] = i;
+            dfs(i + 1, depth + 1);
+        }
+    }
+}
+
+```