From f304f169722e1957998451434264978a7615f030 Mon Sep 17 00:00:00 2001
From: oncsr <khj20006@naver.com>
Date: Mon, 22 Dec 2025 23:56:51 +0900
Subject: [PATCH] =?UTF-8?q?[20251222]=20BOJ=20/=20P3=20/=20=EC=88=98?=
 =?UTF-8?q?=EC=97=B4=EC=9D=98=20=EA=B0=9C=EC=88=98=20NKD=20/=20=EA=B6=8C?=
 =?UTF-8?q?=ED=98=81=EC=A4=80?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 ...4\235\230 \352\260\234\354\210\230 NKD.md" | 77 +++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 "khj20006/202512/22 BOJ P3 \354\210\230\354\227\264\354\235\230 \352\260\234\354\210\230 NKD.md"

diff --git "a/khj20006/202512/22 BOJ P3 \354\210\230\354\227\264\354\235\230 \352\260\234\354\210\230 NKD.md" "b/khj20006/202512/22 BOJ P3 \354\210\230\354\227\264\354\235\230 \352\260\234\354\210\230 NKD.md"
new file mode 100644
index 00000000..1311e915
--- /dev/null
+++ "b/khj20006/202512/22 BOJ P3 \354\210\230\354\227\264\354\235\230 \352\260\234\354\210\230 NKD.md"	
@@ -0,0 +1,77 @@
+```java
+import java.util.*;
+import java.io.*;
+
+public class Main {
+
+    static BufferedReader br;
+    static BufferedWriter bw;
+    static StringTokenizer st;
+
+    static final long MOD = (long)1e9 + 7;
+    static int N, K, D;
+    static long[] dp;
+
+    public static void main(String[] args) throws Exception {
+        bw = new BufferedWriter(new OutputStreamWriter(System.out));
+
+        input();
+        solve();
+
+        bw.close();
+    }
+
+    public static void input() throws Exception {
+        br = new BufferedReader(new InputStreamReader(System.in));
+
+        st = new StringTokenizer(br.readLine());
+        N = Integer.parseInt(st.nextToken());
+        K = Integer.parseInt(st.nextToken());
+        D = Integer.parseInt(st.nextToken());
+
+        br.close();
+    }
+
+    public static void solve() throws Exception {
+        bw = new BufferedWriter(new OutputStreamWriter(System.out));
+
+        if(K > 446) {
+            bw.write("0");
+            return;
+        }
+        if(K == 1) {
+            bw.write(N <= D ? "1" : "0");
+            return;
+        }
+
+        dp = new long[N+2];
+        for(int k=1;k<=K;k++) {
+            long[] pre = new long[N+2];
+            if(k == 1) {
+                for(int i=1;i<=D;i++) {
+                    if(2*i+1 <= N) pre[2*i+1] = (pre[2*i+1] + 1) % MOD;
+                    if(2*i+D+1 <= N) pre[2*i+D+1] = (pre[2*i+D+1] + MOD - 1) % MOD;
+                }
+            }
+            else {
+                int limit = (long)k * D >= (long)N ? N : k * D;
+                for(int i=1;i<=limit;i++) {
+                    if(2*limit+1 <= N) pre[2*limit+1] = (pre[2*limit+1] + dp[i]) % MOD;
+                    if(2*limit+D+1 <= N) pre[2*limit+D+1] = (pre[2*limit+D+1] + MOD - dp[i]) % MOD;
+                }
+            }
+
+            long s = 0;
+            for(int i=1;i<=N;i++) {
+                s = (s + pre[i]) % MOD;
+                pre[i] = s;
+            }
+            for(int i=1;i<=N;i++) dp[i] = pre[i];
+        }
+        bw.write(dp[N] + "\n");
+
+        bw.close();
+    }
+
+}
+```