diff --git a/day_1/lexer.l b/day_1/lexer.l
index 6e92a74..0518bdb 100644
--- a/day_1/lexer.l
+++ b/day_1/lexer.l
@@ -27,8 +27,8 @@ NUM     [0-9]
                 return NEWLINE;
             }
 {NUM}+      {
-                unsigned num = strtoul(yytext, NULL, 10);
-                printf("number: %d\n", num);
+                unsigned long num = strtoul(yytext, NULL, 10);
+                // printf("number: %d\n", num);
                 yylval->num = num;
                 return NUMBER;
             }
@@ -41,13 +41,3 @@ NUM     [0-9]
             }
 
 %%
-
-/*int main() {*/
-    /*std::cout << "hello" << std::endl;*/
-
-    /*yyFlexLexer scanner;*/
-    /*scanner.yylex();*/
-
-    /*std::cout << "done" << std::endl;*/
-    /*return 0;*/
-/*}*/
diff --git a/day_1/parser.y b/day_1/parser.y
index 7818687..9cb47dc 100644
--- a/day_1/parser.y
+++ b/day_1/parser.y
@@ -4,6 +4,17 @@
 /* write out a header file containing the token defines */
 %header
 
+// Code for the header file generated by bison
+%code requires {
+    typedef void* yyscan_t;
+
+    struct parser_state {
+        unsigned long tmp_val;
+        unsigned long* calorie_list;
+        unsigned long size;
+    };
+}
+
 // Code for the c file
 %{
     #include <stdio.h>
@@ -13,7 +24,7 @@
 
     void push_value(struct parser_state* state) {
         // TODO(feliix42): error handling here?
-        state->calorie_list = realloc(state->calorie_list, state->size+1);
+        state->calorie_list = realloc(state->calorie_list, (state->size+1) * sizeof(unsigned long));
         state->calorie_list[state->size] = state->tmp_val;
         state->tmp_val = 0;
         state->size++;
@@ -26,17 +37,6 @@
     }
 %}
 
-// Code for the header file generated by bison
-%code requires {
-    typedef void* yyscan_t;
-
-    struct parser_state {
-        unsigned tmp_val;
-        unsigned* calorie_list;
-        size_t size;
-    };
-}
-
 // define a reentrant parser
 %define api.pure
 
@@ -55,24 +55,25 @@
 
 
 %start input
-%token NEWLINE END_OF_FILE
-%token <unsigned> NUMBER
+%token NEWLINE
+%token <num> NUMBER
+%term END_OF_FILE
 
 %%
 
 input
     : line input
-    | END_OF_FILE       { /* done. */ }
+    | END_OF_FILE       { if (state->tmp_val != 0) { push_value(state); } return 0; }
     ;
 
 line
-    : NUMBER NEWLINE    { state->tmp_val += yylval.num; }
+    : NUMBER NEWLINE    { state->tmp_val += $1; }
     | NEWLINE           { push_value(state); }
     ;
 
 %%
 
-int main(int argc, char** argv) {
+int main(void) {
     struct parser_state* parser_state = calloc(1, sizeof(struct parser_state));
     if (!parser_state) {
         fprintf(stderr, "[error] failed to allocate parser state\n");
@@ -82,7 +83,6 @@ int main(int argc, char** argv) {
     yyscan_t scanner;
     /*YY_BUFFER_STATE state;*/
 
-    printf("Hello World\n");
     if (yylex_init(&scanner)) {
         fprintf(stderr, "\033[91m[error] Could not initialize lexer\n");
         return EXIT_FAILURE;
@@ -97,14 +97,14 @@ int main(int argc, char** argv) {
     yylex_destroy(scanner);
     
     // task 1.1
-    unsigned max_val = 0;
-    for (int i = 0; i < parser_state->size; i++) {
+    unsigned long max_val = 0;
+    for (unsigned long i = 0; i < parser_state->size; i++) {
         if (parser_state->calorie_list[i] > max_val) {
             max_val = parser_state->calorie_list[i];
         }
     }
 
-    printf("Largest individual calorie load: %d\n", max_val);
+    printf("Largest individual calorie load: %lu\n", max_val);
 
 
     return 0;
diff --git a/day_1/state.c b/day_1/state.c
deleted file mode 100644
index 3323891..0000000
--- a/day_1/state.c
+++ /dev/null
@@ -1,15 +0,0 @@
-#include <stdlib.h>
-
-struct parser_state {
-    unsigned tmp_val;
-    unsigned* calorie_list;
-    size_t size;
-};
-
-void push_value(struct parser_state* state) {
-    // TODO(feliix42): error handling here?
-    state->calorie_list = realloc(state->calorie_list, state->size+1);
-    state->calorie_list[state->size] = state->tmp_val;
-    state->tmp_val = 0;
-    state->size++;
-}