[20251109] PGM / LV2 / 숫자 변환하기 / 이인희

LiiNi-coder/202511/09 PGM 숫자 변환하기.md

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+```java
+import java.util.*;
+
+class Solution {
+    private static int MAX = 1_000_001;
+    public int solution(int x, int y, int n) {
+        int answer = 0;
+        Queue<int[]> q = new ArrayDeque<int[]>();
+        q.offer(new int[]{0, x});
+        boolean[] visited = new boolean[MAX];
+        visited[x] = true;
+        boolean hasAnswer = false;
+        int count = 0, value;
+        while(!q.isEmpty()){
+            int[] temp = q.poll();
+            count = temp[0];
+            value = temp[1];
+            if(value == y){
+                hasAnswer = true;
+                break;
+            }
+            for(int new_value: new int[]{value+n, value*2, value*3}){
+                if(new_value >= MAX){
+                    continue;
+                }
+                if(visited[new_value])
+                    continue;
+                q.offer(new int[]{count+1, new_value});
+                visited[new_value] = true;
+            }
+
+        }
+        return (hasAnswer)? count: -1;
+    }
+}
+```