[20250820] BOJ / G4 / 서강그라운드 / 김수연

Author: suyeun84

suyeun84/202508/20 BOJ G4 서강그라운드.md

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+```java
+import java.util.*;
+import java.io.*;
+
+public class Main {
+    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    static StringTokenizer st;
+    static void nextLine() throws Exception {st = new StringTokenizer(br.readLine());}
+    static int nextInt() {return Integer.parseInt(st.nextToken());}
+
+    static int n, m, r, answer = 0;
+    static int[] item;
+    static int[][] dist;
+    public static void main(String[] args) throws Exception {
+        nextLine();
+        n = nextInt();
+        m = nextInt();
+        r = nextInt();
+        item = new int[n+1];
+        dist = new int[n+1][n+1];
+        for (int i = 1; i <= n; i++) {
+            Arrays.fill(dist[i], 16);
+            dist[i][i] = 0;
+        }
+        nextLine();
+        for (int i = 1; i <= n; i++) item[i] = nextInt();
+        for (int i = 0; i < r; i++) {
+            nextLine();
+            int a = nextInt();
+            int b = nextInt();
+            int l = nextInt();
+            dist[a][b] = l;
+            dist[b][a] = l;
+        }
+
+        floyd();
+        System.out.println(answer);
+    }
+
+    static void floyd() {
+        for (int k = 1; k <= n; k++) {
+            for (int i = 1; i <= n; i++) {
+                for (int j = 1; j <= n; j++) {
+                    if (dist[i][j] > dist[i][k] + dist[k][j]) {
+                        dist[i][j] = dist[i][k] + dist[k][j];
+                    }
+                }
+            }
+        }
+        solve();
+    }
+
+    static void solve() {
+        for (int i = 1; i <= n; i++) {
+            int sum = 0;
+            for (int j = 1; j <= n; j++) {
+                if (dist[i][j] <= m) sum += item[j];
+            }
+            answer = Math.max(answer, sum);
+        }
+    }
+}
+```