[20250712] BOJ / G2 / 할로윈의 양아치 / 이강현

lkhyun/202507/12 BOJ G2 할로윈의 양아치.md

@@ -0,0 +1,72 @@
+```java
+import java.util.*;
+import java.io.*;
+
+public class Main{
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    static StringTokenizer st;
+    static int N,M,K;
+    static int[] candies;
+    static List<Integer>[] friends;
+    static int[] dp;
+
+    public static void main(String[] args) throws Exception{
+        st = new StringTokenizer(br.readLine());
+        N = Integer.parseInt(st.nextToken());
+        M = Integer.parseInt(st.nextToken());
+        K = Integer.parseInt(st.nextToken());
+        candies = new int[N+1];
+        friends = new List[N+1];
+        dp = new int[K];
+
+        st = new StringTokenizer(br.readLine());
+        for (int i = 1; i <= N; i++) {
+            candies[i] = Integer.parseInt(st.nextToken());
+            friends[i] = new ArrayList<>();
+        }
+
+        for (int i = 1; i <= M; i++) {
+            st = new StringTokenizer(br.readLine());
+            int u = Integer.parseInt(st.nextToken());
+            int v = Integer.parseInt(st.nextToken());
+            friends[u].add(v);
+            friends[v].add(u);
+        }
+
+        boolean[] visited = new boolean[N+1];
+        for (int i = 1; i <= N; i++) {
+            if(visited[i]) continue;
+            int childCnt = 0;
+            int candyCnt = 0;
+
+            ArrayDeque<Integer> q = new ArrayDeque<>();
+            q.add(i);
+            visited[i] = true;
+            while (!q.isEmpty()) {
+                int u = q.poll();
+                childCnt++;
+                candyCnt += candies[u];
+                for (int v : friends[u]) {
+                    if(!visited[v]) {
+                        q.add(v);
+                        visited[v] = true;
+                    }
+                }
+            }
+
+            for (int j = K-1; j >= childCnt; j--) {
+                dp[j] = Math.max(dp[j],dp[j-childCnt] + candyCnt);
+            }
+        }
+
+        int maxCnt = 0;
+        for (int i = 0; i < K; i++) {
+            maxCnt = Math.max(maxCnt, dp[i]);
+        }
+        bw.write(maxCnt + "");
+
+        bw.close();
+    }
+}
+```