diff --git a/.gitignore b/.gitignore
index 73dcb74..b9f4630 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
 .DS_Store
 .idea/
 /.vscode
+cmake-build-debug/
+CMakeLists.txt
\ No newline at end of file
diff --git a/g0rnn/README.md b/g0rnn/README.md
index f8dcc1e..8e49311 100644
--- a/g0rnn/README.md
+++ b/g0rnn/README.md
@@ -1,15 +1,17 @@
 ## ✏️ 기록
 
-| 차시  |    날짜    |  문제유형  |                                     링크                                      |                        풀이                         |
-| :---: | :--------: | :--------: | :---------------------------------------------------------------------------: | :-------------------------------------------------: |
-| 1차시 | 2024.10.01 |    구현    | [추억 점수](https://school.programmers.co.kr/learn/courses/30/lessons/176963) | https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/35  |
-| 2차시 | 2024.10.03 |    트리    |   [LCA2](https://school.programmers.co.kr/learn/courses/30/lessons/176963)    | https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/7  |
-| 3차시 | 2024.10.04 |   문자열   |             [잃어버린 괄호](https://www.acmicpc.net/problem/1541)             | https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/9  |
-| 4차시 | 2024.10.11 | 브루트포스 |              [영화감독 숌](https://www.acmicpc.net/problem/1436)              | https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/15 |
-| 5차시 | 2024.11.01 |  BFS/DFS   |                [연구소](https://www.acmicpc.net/problem/14502)                | https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/17 |
-| 6차시 | 2024.11.06 |    구현    |                [통계학](https://www.acmicpc.net/problem/2108)                 | https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/23 |
-| 7차시 | 2024.11.25 |    구현    |            [팰린드롬 만들기](https://www.acmicpc.net/problem/1213)            | https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/31 |
-| 8차시 | 2024.11.29 | 문자열 | [잠수함식별](https://www.acmicpc.net/problem/2671) | https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/35 |
-| 9차시 | 2024.12.04 | 그리디 | [A->B](https://www.acmicpc.net/problem/16953) | https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/39 |
+|  차시  |     날짜     |  문제유형   |                                    링크                                     |                         풀이                          |
+|:----:|:----------:|:-------:|:-------------------------------------------------------------------------:|:---------------------------------------------------:|
+| 1차시  | 2024.10.01 |   구현    | [추억 점수](https://school.programmers.co.kr/learn/courses/30/lessons/176963) | https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/35  |
+| 2차시  | 2024.10.03 |   트리    | [LCA2](https://school.programmers.co.kr/learn/courses/30/lessons/176963)  | https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/7  |
+| 3차시  | 2024.10.04 |   문자열   |              [잃어버린 괄호](https://www.acmicpc.net/problem/1541)              | https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/9  |
+| 4차시  | 2024.10.11 |  브루트포스  |              [영화감독 숌](https://www.acmicpc.net/problem/1436)               | https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/15 |
+| 5차시  | 2024.11.01 | BFS/DFS |               [연구소](https://www.acmicpc.net/problem/14502)                | https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/17 |
+| 6차시  | 2024.11.06 |   구현    |                [통계학](https://www.acmicpc.net/problem/2108)                | https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/23 |
+| 7차시  | 2024.11.25 |   구현    |             [팰린드롬 만들기](https://www.acmicpc.net/problem/1213)              | https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/31 |
+| 8차시  | 2024.11.29 |   문자열   |               [잠수함식별](https://www.acmicpc.net/problem/2671)               | https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/35 |
+| 9차시  | 2024.12.04 |   그리디   |               [A->B](https://www.acmicpc.net/problem/16953)               | https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/39 |
+| 10차시 | 2024.12.20 |   그래프   |                [결혼식](https://www.acmicpc.net/problem/5567)                | https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/40 |
+| 11차시 | 2024.12.30 |   dp    |               [기타리스트](https://www.acmicpc.net/problem/1495)               | https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/49 |
 
 ---
diff --git a/g0rnn/dp/11-g0rnn.cpp b/g0rnn/dp/11-g0rnn.cpp
new file mode 100644
index 0000000..4ff7d28
--- /dev/null
+++ b/g0rnn/dp/11-g0rnn.cpp
@@ -0,0 +1,38 @@
+//
+// Created by 김균호 on 2024. 12. 31..
+//
+// 1. 조절한 볼륨이 0보다 작거나 max보다 크면 연주할 수 없다 -> -1
+// 2. 범위 내의 최댓값을 구하라
+
+#include <iostream>
+using namespace std;
+
+int n, s, m;
+int v[55];
+bool dp[55][1005];
+int ans = -1;
+
+int main() {
+	cin >> n >> s >> m;
+	for (int i = 1; i <= n; i++)
+		cin >> v[i];
+
+	if (s + v[1] <= m) dp[1][s + v[1]] = true;
+	if (s - v[1] >= 0) dp[1][s - v[1]] = true;
+
+	for (int i = 2; i <= n; i++) {
+		for (int j = 0; j <= m; j++) {
+			if (!dp[i - 1][j]) continue;
+			if (j + v[i] <= m) dp[i][j + v[i]] = true;
+			if (j - v[i] >= 0) dp[i][j - v[i]] = true;
+		}
+	}
+	for (int i = m; i >= 0; i--) {
+		if (dp[n][i]) {
+			ans = i;
+			break;
+		}
+	}
+	cout << ans;
+	return 0;
+}
diff --git a/g0rnn/graph/10-g0rnn.cpp b/g0rnn/graph/10-g0rnn.cpp
new file mode 100644
index 0000000..45664a3
--- /dev/null
+++ b/g0rnn/graph/10-g0rnn.cpp
@@ -0,0 +1,38 @@
+//
+// Created by 김균호 on 2024. 12. 20..
+//
+#include <iostream>
+#include <unordered_set>
+#include <vector>
+using namespace std;
+
+const int SANG = 1;
+int n, m;
+int ret = 0;
+vector<unordered_set<int> > relationship;
+unordered_set<int> members = {1};
+
+int main() {
+	cin >> n >> m;
+	relationship = vector<unordered_set<int> >(n + 1);
+	int a, b;
+
+	for (int i = 0; i < m; i++) {
+		cin >> a >> b;
+		//
+		if (a == SANG) members.insert(b);
+		// make a graph
+		relationship[a].insert(b);
+		relationship[b].insert(a);
+	}
+
+	// find friends' friends
+	for (auto f: relationship[SANG]) {
+		for (auto r: relationship[f]) {
+			members.insert(r);
+		}
+	}
+
+	// exclude SANG
+	cout << members.size() - 1;
+}