[20250924] PGM / LV3 / 합승 택시 요금 / 김수연

[20250924] PGM / LV3 / 합승 택시 요금 / 김수연

Author: suyeun84

suyeun84/202509/24 PGM LV3 합승 택시 요금.md

@@ -0,0 +1,29 @@
+```java
+import java.util.*;
+class Solution {
+    public int solution(int n, int s, int a, int b, int[][] fares) {
+        int answer = Integer.MAX_VALUE;
+        int[][] dist = new int[n+1][n+1];
+        for (int i = 1; i <= n; i++) {
+            Arrays.fill(dist[i], 200*100000+1);
+            dist[i][i] = 0;
+        }
+        for (int i = 0; i < fares.length; i++) {
+            dist[fares[i][0]][fares[i][1]] = fares[i][2];
+            dist[fares[i][1]][fares[i][0]] = fares[i][2];
+        }
+        
+        for (int k = 1; k <= n; k++) {
+            for (int i = 1; i <= n; i++) {
+                for (int j = 1; j <= n; j++) {
+                    dist[i][j] = Math.min(dist[i][j], dist[i][k] + dist[k][j]);
+                }
+            }
+        }
+        for (int i = 1; i <= n; i++) {
+            answer = Math.min(answer, dist[s][i] + dist[i][a] + dist[i][b]);
+        }
+        return answer;
+    }
+}
+```