diff --git a/caucsejunseo/README.md b/caucsejunseo/README.md
index 2267737..f576f01 100644
--- a/caucsejunseo/README.md
+++ b/caucsejunseo/README.md
@@ -9,4 +9,5 @@
  | 5차시 | 2025.04.02 |   큐    |  [요세푸스문제](https://www.acmicpc.net/problem/1158)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/19|
  | 6차시 | 2025.04.06 |   큐    | [앵무새](https://www.acmicpc.net/problem/14713)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/23|
  | 7차시 | 2025.04.10 |  그리디  | [폴리오미노](https://www.acmicpc.net/problem/1343)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/28|
- | 8차시 | 2025.04.11 | 연결리스트| [키로거](https://www.acmicpc.net/problem/5397)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/30|
+| 8차시 | 2025.04.11 | 연결리스트| [키로거](https://www.acmicpc.net/problem/5397)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/30|
+| 9차시 | 2025.04.30 | 문자열   | [듣보잡](https://www.acmicpc.net/problem/1764)|https://github.com/AlgoLeadMe/AlgoLeadMe-13/pull/35|
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diff --git "a/caucsejunseo/\354\236\220\353\243\214 \352\265\254\354\241\260/2025.03.22.\353\213\250\354\226\264\353\222\244\354\247\221\352\270\2602.c" "b/caucsejunseo/\353\254\270\354\236\220\354\227\264/2025.03.22.\353\213\250\354\226\264\353\222\244\354\247\221\352\270\2602.c"
similarity index 100%
rename from "caucsejunseo/\354\236\220\353\243\214 \352\265\254\354\241\260/2025.03.22.\353\213\250\354\226\264\353\222\244\354\247\221\352\270\2602.c"
rename to "caucsejunseo/\353\254\270\354\236\220\354\227\264/2025.03.22.\353\213\250\354\226\264\353\222\244\354\247\221\352\270\2602.c"
diff --git "a/caucsejunseo/\353\254\270\354\236\220\354\227\264/2025.04.30.\353\223\243\353\263\264\354\236\241.c" "b/caucsejunseo/\353\254\270\354\236\220\354\227\264/2025.04.30.\353\223\243\353\263\264\354\236\241.c"
new file mode 100644
index 0000000..87393c0
--- /dev/null
+++ "b/caucsejunseo/\353\254\270\354\236\220\354\227\264/2025.04.30.\353\223\243\353\263\264\354\236\241.c"
@@ -0,0 +1,177 @@
+#define _CRT_SECURE_NO_WARNINGS
+#include <stdio.h>
+#include <stdlib.h> 
+#include <string.h>
+
+#define LINE 21
+#define MAX 500000
+
+typedef struct Nolisten {
+
+    char name[LINE];
+
+} Nolisten;
+
+typedef struct Nosee {
+
+    char name[LINE];
+}Nosee;
+
+typedef struct Nolistenandsee {
+
+    char name[LINE];
+
+} Nolistenandsee;
+
+// strcmp 기반 구조체 비교 함수
+int compare_struct(const void* a, const void* b) {
+    return strcmp(((Nolisten*)a)->name, ((Nolisten*)b)->name);
+}
+
+
+int main(void) {
+
+    int N = 0;
+    int M = 0;
+    int count = 0;
+
+
+    scanf("%d", &N);
+    scanf("%d", &M);
+    getchar();
+
+    //구조체 메모리 공간 할당
+    Nolisten* nolistenlist = malloc(sizeof(Nolisten) * N);
+    Nosee* noseelist = malloc(sizeof(Nosee) * M);
+    Nolistenandsee* nolistenandseelist = malloc(sizeof(Nolistenandsee) * MAX);
+
+
+    //입력받기
+    for (int i = 0; i < N; i++)
+    {
+        fgets(nolistenlist[i].name, LINE, stdin);
+        nolistenlist[i].name[strcspn(nolistenlist[i].name, "\n")] = '\0';  // 개행 제거
+    }
+    for (int j = 0; j < M; j++)
+    {
+        fgets(noseelist[j].name, LINE, stdin);
+        noseelist[j].name[strcspn(noseelist[j].name, "\n")] = '\0';  // 개행 제거
+    }
+
+    //듣도보도 못한 놈인지 확인
+    qsort(nolistenlist, N, sizeof(Nolisten), compare_struct);
+
+    for (int j = 0; j < M; j++)
+    {
+        Nolisten key;
+        strcpy(key.name, noseelist[j].name);
+
+        Nolisten* found = bsearch(&key, nolistenlist, N, sizeof(Nolisten), compare_struct);
+        if (found != NULL) {
+            strcpy(nolistenandseelist[count++].name, key.name);
+        }
+    }
+
+    qsort(nolistenandseelist, count, sizeof(Nolistenandsee), compare_struct);
+
+    // 정답 출력
+    printf("%d\n", count);
+    for (int i = 0; i < count; i++) {
+        printf("%s\n", nolistenandseelist[i].name);
+    }
+
+
+    return 0;
+}
+
+// 시간초과 코드
+/*#define _CRT_SECURE_NO_WARNINGS
+ #include <stdio.h>
+ # include <stdlib.h>
+ #include <string.h>
+
+#define LINE 21
+#define MAX 500000
+
+typedef struct Nolisten {
+
+    char name[LINE];
+
+} Nolisten;
+
+typedef struct Nosee {
+
+    char name[LINE];
+}Nosee;
+
+typedef struct Nolistenandsee {
+
+    char name[LINE];
+
+} Nolistenandsee;
+
+int compare_name(const void* a, const void* b) {
+    const Nolistenandsee* na = (const Nolistenandsee*)a;
+    const Nolistenandsee* nb = (const Nolistenandsee*)b;
+    return strcmp(na->name, nb->name);
+}
+
+int main(void) {
+
+    int N = 0;
+    int M = 0;
+    int count = 0;
+
+
+    scanf("%d", &N);
+    scanf("%d", &M);
+    getchar();
+
+    //구조체 메모리 공간 할당
+    Nolisten* nolistenlist = malloc(sizeof(Nolisten) * N);
+    Nosee* noseelist = malloc(sizeof(Nosee) * M);
+    Nolistenandsee* nolistenandseelist = malloc(sizeof(Nolistenandsee) * MAX);
+
+
+   //입력받기
+    for (int i = 0; i < N; i++)
+    {
+        fgets(nolistenlist[i].name, LINE, stdin);
+        nolistenlist[i].name[strcspn(nolistenlist[i].name, "\n")] = '\0';  // 개행 제거
+    }
+    for (int j = 0; j < M; j++)
+    {
+        fgets(noseelist[j].name, LINE, stdin);
+        noseelist[j].name[strcspn(noseelist[j].name, "\n")] = '\0';  // 개행 제거
+    }
+
+    //듣도보도 못한 놈인지 확인
+    for (int i = 0; i < N; i++)
+    {
+        for (int j = 0; j < M; j++)
+        {
+            if (strlen(nolistenlist[i].name) == strlen(noseelist[j].name))
+            {
+                if (strcmp(nolistenlist[i].name, noseelist[j].name) == 0)
+                {
+                    strcpy(nolistenandseelist[count].name, nolistenlist[i].name);
+                    count++;
+
+                }
+           }
+        }
+    }
+
+    // 듣보잡 이름 정렬
+    qsort(nolistenandseelist, count, sizeof(Nolistenandsee), compare_name);
+
+    // 정답 출력
+    printf("%d\n", count);
+    for (int i = 0; i < count; i++) {
+        printf("%s\n", nolistenandseelist[i].name);
+    }
+
+
+    return 0;
+}
+*/
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