[20250828] BOJ / G4 / 이모티콘 / 이준희

JHLEE325/202508/28 BOJ G4 이모티콘.md

@@ -0,0 +1,61 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+
+    static class State {
+        int cur, clip;
+
+        State(int cur, int clip) {
+            this.cur = cur;
+            this.clip = clip;
+        }
+    }
+
+    static int s;
+    static int range = 2000;
+
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        s = Integer.parseInt(br.readLine());
+        System.out.println(bfs());
+    }
+
+    static int bfs() {
+        int[][] dist = new int[range + 1][range + 1];
+        for (int i = 0; i <= range; i++) Arrays.fill(dist[i], -1);
+
+        ArrayDeque<State> q = new ArrayDeque<>();
+        q.add(new State(1, 0));
+        dist[1][0] = 0;
+
+        while (!q.isEmpty()) {
+            State now = q.poll();
+            int cur = now.cur;
+            int clip = now.clip;
+            int t = dist[cur][clip];
+
+            if (cur == s)
+                return t;
+
+            if (dist[cur][cur] == -1) {
+                dist[cur][cur] = t + 1;
+                q.add(new State(cur, cur));
+            }
+
+            if (clip > 0 && cur + clip <= range && dist[cur + clip][clip] == -1) {
+                dist[cur + clip][clip] = t + 1;
+                q.add(new State(cur + clip, clip));
+            }
+
+            if (cur > 0 && dist[cur - 1][clip] == -1) {
+                dist[cur - 1][clip] = t + 1;
+                q.add(new State(cur - 1, clip));
+            }
+        }
+        return -1;
+    }
+}
+
+```