diff --git a/semester2/challenge1/main.c b/semester2/challenge1/main.c
index 102fa4b..a18d0f1 100644
--- a/semester2/challenge1/main.c
+++ b/semester2/challenge1/main.c
@@ -18,28 +18,51 @@ typedef struct Genres
     struct Genres *next;
 } Genres;
 
+const char *genreMap[] = {"Action", "Adventure", "Animation", "Children",
+                          "Comedy", "Crime", "Documentary", "Drama",
+                          "Fantasy", "Film-Noir", "Horror", "IMAX", "Musical",
+                          "Mystery", "Romance", "Sci-Fi", "Thriller",
+                          "War", "Western"};
+
 //输入电影风格返回其映射的id
-int movie_style_map(char *style)
+int getGenreID(char *style)
 {
 
-    int index = 0;
-    const char *movies[] = {"Action", "Adventure", "Animation", "Children's",
-                            "Comedy", "Crime", "Documentary", "Drama",
-                            "Fantasy", "Film-Noir", "Horror", "IMAX", "Musical",
-                            "Mystery", "Romance", "Sci-Fi", "Thriller",
-                            "War", "Western"};
+    // int index = 0;
+    // const char *genreMap[] = {"Action", "Adventure", "Animation", "Children's",
+    //                         "Comedy", "Crime", "Documentary", "Drama",
+    //                         "Fantasy", "Film-Noir", "Horror", "IMAX", "Musical",
+    //                         "Mystery", "Romance", "Sci-Fi", "Thriller",
+    //                         "War", "Western"};
 
-    while (strcmp(movies[index], style) != 0)
-    {
-        index++;
+    // while (strcmp(genreMap[index], style) != 0)
+    // {
+    //     index++;
+    // }
+
+    int found = 0;
+    int i;
+    for (i = 0; i < NUM_GENRES - 1; i++) {
+        if (strcmp(genreMap[i], style) == 0) {
+            found = 1;
+            break;
+        }
+    }
+    if (found == 1) {
+        return i;
+    }
+    else {
+        return -1;
     }
-    return index;
 }
 
 // 函数原型
 Movies *appendMovies(Movies *last, int id);
-int getGenreID(int movieID, Genres ** movies); // 传入movieID,输出风格下标
-void clearArrInt(int* arr, int size); // 将所有元素设为0
+Genres *appendGenres(Genres *head, int id);
+void incremendGenres(int count[], int movieID, Genres **movies); // 传入movieID,输出风格下标
+void clearArrInt(int *arr, int size);                            // 将所有元素设为0
+void parseGenreString(char *inputStr, int movieID, Genres **movies_arr);
+// inputStr: "Adventure|IMAX..." movieID: the id to make genre linked list. movies_arr[]: to store the linked list.
 
 int main(void)
 {
@@ -59,7 +82,7 @@ int main(void)
     fgets(buf, 256 * sizeof(char), fp);
 
     // 看每个用户喜欢什么电影
-    int userID, movieID;
+    int userID, movieID, rating;
     char input[64];
     int loc, loc1;
     while (fgets(buf, 256 * sizeof(char), fp) != NULL)
@@ -85,72 +108,133 @@ int main(void)
             loc++;
         }
         input[loc1] = '\0';
+        loc++;
+
+        // ATOI(3)                   Linux Programmer's Manual                  ATOI(3)
+        // NAMint count[], E
+        //  atoi, atol, atoll - convert a string to an integer
+
         movieID = atoi(input);
         // printf("movieID: %d\n", movieID);
-        users[userID] = appendMovies(users[userID], movieID);
+
+        // get ratings
+        input[0] = '\0';
+        loc1 = 0;
+        while (buf[loc] != ',')
+        {
+            input[loc1++] = buf[loc];
+            loc++;
+        }
+        input[loc1] = '\0';
+        rating = atoi(input);
+
+        if (rating >= 3)
+        {
+            printf("Rate: %d, userID: %d, movieID: %d\n", rating, userID, movieID);
+            users[userID] = appendMovies(users[userID], movieID);
+        }
     }
 
     fclose(fp);
 
-    fp = fopen("./movies.csv", 'r');
+    fp = fopen("./movies.csv", "r");
 
     // 下标表示电影id
     Genres *movies[NUM_MOVIES];
 
-
     // TODO: 仿照我的代码填充*movies数组
     // 李王子写 ok 你写吧
-    //
 
-    //
-    for(int i=0;i<NUM_MOVIES;i++)
+    for (int i = 0; i < NUM_MOVIES; i++)
     {
-        movies[i]=NULL;
+        movies[i] = NULL;
     }
 
-
-    char*str=(char*)malloc(256*sizeof(char));
+    char *str = (char *)malloc(256 * sizeof(char));
 
     //读第一行
-    fgets(str, 256 * sizeof(char), fp); 
-    
+    fgets(str, 256 * sizeof(char), fp);
+
     //        fgets() returns s on success, and NULL on error or when end  of  file
     //   occurs while no characters have been read.
     //      你那个该写!=NULL 你看注释
-    //  ok 
+    //  ok
 
-    
-    int id_index=0;
+    int movie_id = 0;
 
-    while(fgets(str,256*sizeof(char),fp)!=NULL)
+    while (fgets(str, 256 * sizeof(char), fp) != NULL)
     {
-        
+        // get the movie's id
+        loc = 0;
+        input[0] = '\0';
 
+        while (str[loc] != ',')
+        {
+            input[loc] = str[loc];
+            loc++;
+        }
+        input[loc++] = '\0'; // 现在loc指向电影名字的第0个字符
+        movie_id = atoi(input);
+        printf("Debug: movie_id: %d\n", movie_id);
+
+        if (str[loc] == '"')
+        { // in case the title has comma inside.
+            loc++;
+            while (str[loc] != '"')
+            {
+                loc++;
+            }
+            loc += 2; // 现在指向genres第0个字符
+        }
+        else
+        {
+            // go to genres
+            while (str[loc] != ',')
+                loc++;
+            loc++; // 现在loc指向风格
+        }
+
+        loc1 = 0;
+        input[0] = '\0';
+
+        while (str[loc] != '\n' && str[loc] != '\0' && str[loc] != '\r')
+        {
+            input[loc1++] = str[loc++];
+        }
+        input[loc1] = '\0';
+        parseGenreString(input, movie_id, movies);
     }
 
-
-
     fclose(fp);
 
     // 开始输出答案到文件answer.txt
 
-    fp = fopen("./answer.txt", 'w+'); // w+: 如果文件已存在先清空
+    fp = fopen("./answer.txt", "w+"); // w+: 如果文件已存在先清空
 
     int count[NUM_GENRES] = {};
 
     // 开始从第一个用户循环 (1)
     Movies *ptr;
-    for (int i = 1; i < NUM_GENRES; i++) {
-        cleararrInt(count, NUM_GENRES);
+    for (int i = 1; i < NUM_USERS; i++)
+    {
+        clearArrInt(count, NUM_GENRES);
         // 便历他喜欢的电影
         ptr = users[i];
-        while (ptr != NULL) {
-            count[getGenreID(ptr->movieID, movies)] ++;
+        while (ptr != NULL)
+        {
+            incremendGenres(count, ptr->movieID, movies);
+            printf("Debug: userID: %d, movieID: %d\n", i, ptr->movieID);
             ptr = ptr->next;
         }
-    }
 
-    //那个 就是你帮我写的那个数组 我感觉开个一维数组就可以了啊 
+        // 输出答案
+        fprintf(fp, "User id: %d\n", i);
+        for (int j = 0; j < NUM_GENRES - 1; j++)
+        {
+            fprintf(fp, "%s: %d\t", genreMap[j], count[j]);
+        }
+        fprintf(fp, "\n");
+    }
 
     fclose(fp);
 
@@ -182,13 +266,79 @@ Movies *appendMovies(Movies *last, int id)
     return last;
 }
 
-
-int getGenreID(int movieID, Genres **movies) {
+void incremendGenres(int count[], int movieID, Genres **movies)
+{
     Genres *ptr = movies[movieID];
+    while (ptr != NULL)
+    {
+        count[ptr->genreID]++;
+        printf("Debug: movidID: %d, genreID: %d, genre: %s\n", movieID, ptr->genreID, genreMap[ptr->genreID]);
+        ptr = ptr->next;
+    }
 }
 
-void clearArrInt(int* arr, int size) {
-    for (int i = 0; i < size; i++) {
+void clearArrInt(int *arr, int size)
+{
+    for (int i = 0; i < size; i++)
+    {
         arr[i] = 0;
     }
+}
+
+void parseGenreString(char *inputStr, int movieID, Genres **movies_arr)
+{
+    // 处理输入的string
+    int strLen = strlen(inputStr);
+    char buf[64];
+    int locPtr = 0;
+    printf("Debug: inputStr: %s\n", inputStr);
+    int genreID;
+
+    for (int i = 0; i < strLen; i++)
+    {
+        if (inputStr[i] == '|')
+        { // time to divide the string and make magic happen
+            buf[locPtr] = '\0';
+            printf("Debug: buf: %s, genreID: %d\n", buf, getGenreID(buf));
+            genreID = getGenreID(buf);
+            if (genreID != -1)
+                movies_arr[movieID] = appendGenres(movies_arr[movieID], genreID);
+            locPtr = 0;
+        }
+        else
+        {
+            buf[locPtr++] = inputStr[i];
+        }
+    }
+    
+    // do this again
+    buf[locPtr] = '\0';
+    printf("Debug: buf: %s, genreID: %d\n", buf, getGenreID(buf));
+    genreID = getGenreID(buf);
+    if (genreID != -1)
+        movies_arr[movieID] = appendGenres(movies_arr[movieID], genreID);
+    locPtr = 0;
+}
+
+Genres *appendGenres(Genres *head, int id)
+{
+    Genres *new = malloc(sizeof(Genres));
+
+    new->genreID = id;
+    new->next = NULL;
+
+    if (head == NULL)
+    {
+        return new;
+    }
+
+    Genres *ptr = head;
+
+    while (ptr->next != NULL)
+    {
+        ptr = ptr->next;
+    }
+    ptr->next = new;
+
+    return head;
 }
\ No newline at end of file