[20251010] BOJ / G3 / 전국시대 / 한종욱

Author: Ukj0ng

Ukj0ng/202510/10 BOJ G3 전국시대.md

@@ -0,0 +1,99 @@
+```
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    private static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    private static Map<Integer, Integer> result;
+    private static int[] power, uf, size;
+    private static int N, M;
+    public static void main(String[] args) throws IOException {
+        init();
+
+        for (int i = 1; i <= N; i++) {
+            int root = find(i);
+
+            if (!result.containsKey(root) && power[root] > 0) {
+                result.put(root, power[root]);
+            }
+        }
+
+        bw.write(result.size() + "\n");
+
+        List<Integer> value = new ArrayList<>(result.values());
+        Collections.sort(value);
+
+        for (int element : value) {
+            bw.write(element + " ");
+        }
+        bw.flush();
+        bw.close();
+        br.close();
+    }
+
+    private static void init() throws IOException {
+        StringTokenizer st = new StringTokenizer(br.readLine());
+        N = Integer.parseInt(st.nextToken());
+        M = Integer.parseInt(st.nextToken());
+
+        power = new int[N+1];
+        uf = new int[N+1];
+        size = new int[N+1];
+
+        result = new HashMap<>();
+
+        for (int i = 1; i <= N; i++) {
+            power[i] = Integer.parseInt(br.readLine());
+            uf[i] = i;
+            size[i] = 1;
+        }
+
+        for (int i = 0; i < M; i++) {
+            st = new StringTokenizer(br.readLine());
+            int O = Integer.parseInt(st.nextToken());
+            int P = Integer.parseInt(st.nextToken());
+            int Q = Integer.parseInt(st.nextToken());
+
+            union(P, Q, O);
+        }
+    }
+
+    private static void union(int x, int y, int o) {
+        int X = find(x);
+        int Y = find(y);
+
+        if (o == 1) {
+            if (size[X] < size[Y]) {
+                uf[X] = Y;
+                size[Y] += size[X];
+                power[Y] += power[X];
+
+            } else {
+                uf[Y] = X;
+                size[X] += size[Y];
+                power[X] += power[Y];
+            }
+        } else {
+            if (power[X] == power[Y]) {
+                power[X] = 0;
+                power[Y] = 0;
+            } else if (power[X] > power[Y]) {
+                uf[Y] = X;
+                size[X] += size[Y];
+                power[X] -= power[Y];
+            } else {
+                uf[X] = Y;
+                size[Y] += size[X];
+                power[Y] -= power[X];
+            }
+        }
+    }
+
+    private static int find(int x) {
+        if (uf[x] == x) return x;
+
+        return uf[x] = find(uf[x]);
+    }
+}
+```