diff --git a/dohyeondol1/README.md b/dohyeondol1/README.md
index ecae6d3..d2234fe 100644
--- a/dohyeondol1/README.md
+++ b/dohyeondol1/README.md
@@ -10,3 +10,4 @@
  | 6차시 | 2025.04.05 |  DP  | [평범한 배낭](https://www.acmicpc.net/problem/12865)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/22|
  | 7차시 | 2025.04.08 |  트리  | [트리 순회](https://www.acmicpc.net/problem/1991)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/26|
  | 8차시 | 2025.04.11 |  덱  | [회전하는 큐](https://www.acmicpc.net/problem/1021)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/32|
+ | 9차시 | 2025.04.30 |  그리디 알고리즘  | [체육복](https://school.programmers.co.kr/learn/courses/30/lessons/42862)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/33|
\ No newline at end of file
diff --git "a/dohyeondol1/\352\267\270\353\246\254\353\224\224 \354\225\214\352\263\240\353\246\254\354\246\230/9-dohyeondol1.cpp" "b/dohyeondol1/\352\267\270\353\246\254\353\224\224 \354\225\214\352\263\240\353\246\254\354\246\230/9-dohyeondol1.cpp"
new file mode 100644
index 0000000..8b93b6c
--- /dev/null
+++ "b/dohyeondol1/\352\267\270\353\246\254\353\224\224 \354\225\214\352\263\240\353\246\254\354\246\230/9-dohyeondol1.cpp"	
@@ -0,0 +1,43 @@
+#include <string>
+#include <vector>
+#include <algorithm>
+using namespace std;
+
+int solution(int n, vector<int> lost, vector<int> reserve) {
+    int answer = 0;
+    
+    answer += n - lost.size();
+    sort(lost.begin(), lost.end());
+    sort(reserve.begin(), reserve.end());
+    
+    for (int i = 0; i < lost.size(); ) {
+        bool found = false;
+        for (int j = 0; j < reserve.size(); j++) {
+            if (lost[i] == reserve[j]) {
+                lost.erase(lost.begin() + i);
+                reserve.erase(reserve.begin() + j);
+                found = true;
+                answer++;
+                break;
+            }
+        }
+        if (!found) i++;
+    }
+    
+    for(int i = 0; i < lost.size(); i++) {
+        for(int j = 0; j < reserve.size(); j++) {
+            if((lost[i]-1) == reserve[j]) {
+                reserve.erase(reserve.begin());
+                answer++;
+                break;
+            }
+            else if(lost[i]+1 == reserve[j]) {
+                reserve.erase(reserve.begin());
+                answer++;
+                break;
+            }
+        }
+    }
+    
+    return answer;
+}
\ No newline at end of file