diff --git a/.gitignore b/.gitignore
index b9f4630..6eb604d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,5 @@
 .idea/
 /.vscode
 cmake-build-debug/
-CMakeLists.txt
\ No newline at end of file
+CMakeLists.txt
+.clang-tidy
\ No newline at end of file
diff --git a/g0rnn/README.md b/g0rnn/README.md
index c772e8f..b14c8af 100644
--- a/g0rnn/README.md
+++ b/g0rnn/README.md
@@ -15,6 +15,14 @@
 | 11차시 | 2024.12.30 |   dp    |               [기타리스트](https://www.acmicpc.net/problem/1495)               | https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/49 |
 | 12차시 | 2025.01.02 |   bfs   |               [회장뽑기](https://www.acmicpc.net/problem/2660)                | https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/50 |
 | 13차시 | 2025.01.05 |  백트래킹   |             [스타트와 링크](https://www.acmicpc.net/problem/14889)              | https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/52 |
+| 14차시 | 2025.01.07 |  백트레킹   |              [N-Queen](https://www.acmicpc.net/problem/9663)              | https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/53 |
+| 15차시 | 2025.01.15 |  백트래킹   |                [알파벳](https://www.acmicpc.net/problem/1987)                | https://github.com/AlgoLeadMe/AlgoLeadMe-12/pull/60 |
+
+
+
+
+
+
 
 
 ---
diff --git a/g0rnn/backtracking/15-g0rnn.cpp b/g0rnn/backtracking/15-g0rnn.cpp
new file mode 100644
index 0000000..a27dc41
--- /dev/null
+++ b/g0rnn/backtracking/15-g0rnn.cpp
@@ -0,0 +1,37 @@
+//
+// Created by 김균호 on 2025. 1. 14..
+//
+#include <iostream>
+using namespace std;
+
+int r, c;
+string line;
+int answer = 0;
+char board[20][20];
+bool visited[26];
+int offset[4][2] = {{0, 1}, {1, 0}, {0, -1}, {-1, 0}};
+
+void backtrack(int x, int y, int cnt) {
+	answer = max(answer, cnt);
+	for (auto &dir: offset) {
+		int nx = x + dir[0];
+		int ny = y + dir[1];
+		if (0 <= nx && nx < c && 0 <= ny && ny < r && !visited[board[ny][nx] - 'A']) {
+			visited[board[ny][nx] - 'A'] = true;
+			backtrack(nx, ny, cnt + 1);
+			visited[board[ny][nx] - 'A'] = false;
+		}
+	}
+}
+
+int main() {
+	cin >> r >> c;
+	for (int i = 0; i < r; i++) {
+		cin >> line;
+		for (int k = 0; k < line.size(); k++) board[i][k] = line[k];
+	}
+	visited[board[0][0] - 'A'] = true;
+	backtrack(0, 0, 1);
+	cout << answer;
+	return 0;
+}