[20251110] BOJ / G4 / 점프 / 이종환

0224LJH/202511/10 BOJ 점프.md

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+```java
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.LinkedList;
+import java.util.PriorityQueue;
+import java.util.Queue;
+import java.util.StringTokenizer;
+
+public class Main {
+
+	static int[][] dp = new int[10001][500];
+	static HashSet<Integer> set = new HashSet<>();
+	static int total,setSize,ans;
+
+
+    public static void main(String[] args) throws IOException {
+    	init();
+    	process();
+    	print();
+
+
+    }
+
+    private static void init() throws IOException{
+    	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    	StringTokenizer st = new StringTokenizer(br.readLine());
+    	total = Integer.parseInt(st.nextToken());
+    	setSize = Integer.parseInt(st.nextToken());
+    	for (int i = 0; i < setSize; i++) {
+    		set.add(Integer.parseInt(br.readLine()));
+    	}
+    	for (int i = 0; i <= 10000; i++) {
+    		Arrays.fill(dp[i], Integer.MAX_VALUE);
+    	}
+
+
+    }
+
+    private static void process() throws IOException {
+    	if (set.contains(2)) {
+    		ans = -1;
+    		return;
+    	}
+    	dp[2][1] = 1;
+    	for (int i = 2; i< total; i++) {
+    		if (set.contains(i)) continue;
+    		for (int j = 1; j < 500; j++) {
+    			if (dp[i][j] == Integer.MAX_VALUE) continue;
+
+    			int more = j+1;
+    			int less =j-1;
+    			if (more < 500 && i+more <= total && !set.contains(i+more)) {
+    				dp[i+more][more] = Math.min(dp[i+more][more], dp[i][j]+1);
+    			}
+    			if (j <  500 && i+j <= total && !set.contains(i+j)) {
+    				dp[i+j][j] = Math.min(dp[i+j][j], dp[i][j]+1);
+    			}
+    			if (less != 0 && i+less <=total && !set.contains(i+less)) {
+    				dp[i+less][less] = Math.min(dp[i+less][less], dp[i][j]+1);
+    			}
+    		}
+    	}
+
+    	ans = Integer.MAX_VALUE;
+    	for (int i = 1; i < 500; i++) {
+    		ans = Math.min(ans, dp[total][i]);
+    	}
+    	if (ans == Integer.MAX_VALUE) ans = -1;
+
+    }
+
+
+	private static void print() {
+    	System.out.print(ans);
+    }
+
+}
+```