diff --git a/05/_.h b/05/_.h
new file mode 100644
index 0000000..3f93823
--- /dev/null
+++ b/05/_.h
@@ -0,0 +1,25 @@
+#pragma once
+
+#include <ctype.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <string.h>
+#include <stdio.h>
+#include <assert.h>
+#include <strings.h>
+#include <wctype.h>
+#include <math.h>
+
+#define MAX(X, Y) ((X) > (Y) ? (X) : (Y))
+#define MIN(X, Y) ((X) < (Y) ? (X) : (Y))
+#define ABS(X) ((X) >= 0 ? (X) : -(X))
+
+char** str_split(char* a_str, const char a_delim);
+
+int str_index(char *str, char c);
+
+int number_of_element(char *str, char c);
+
+long gmc(long a, long b);
+long lmc(long a, long b);
+long lmcs(int array[], int n);
diff --git a/05/main.txt b/05/main.txt
new file mode 100644
index 0000000..7c960aa
--- /dev/null
+++ b/05/main.txt
@@ -0,0 +1,1176 @@
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diff --git a/05/main2.txt b/05/main2.txt
new file mode 100644
index 0000000..5b5c7ae
--- /dev/null
+++ b/05/main2.txt
@@ -0,0 +1,175 @@
+56,79,55,52,85,41,61,97,64,72,86,46,58,48,96,62,76,12,13
+16,95,77,51,17,49,33,56,97
+95,38,49,61,32,19,77,22,13,27,56
+84,22,89,64,45,79,34,85,72,96,48,55,29
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+79,72,96,45,76,58,64,46,55,84,86,63,22,52,18,93,85,31,47,41,29,89,81
+33,34,84,32,49,93,54,63,95,27,83,17,77,28,29,38,42,26,44,11,18
+34,18,93,63,83,95,51,32,26,27,11,19,42,28,49,33,56
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+31,55,13,22,84,47,72
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+34,18,93,63,16,77,51,32,17,26,54,44,11,28,38,49,33,56,61
+45,89,84,93,77
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+41,45,89,52,55,31,29,84,34,18,93,83,95,77,51,17,26,54,27,44,11
+85,89,31,29,84,34,63,16,95,77,51,27,44
+72,62,47,49,97,45,76,61,79,38,13,22,56
+89,18,46,55,63,72,85,41,64,83,16,52,45,51,96,17,31,93,29
+58,41,45,52,55,18,93,83,95,77,51
+97,12,22,86,47,79,81,58,76,46,64,96,72,85,41,45,89,52,55,31,29,84,18
+79,81,58,76,46,64,72,85,41,45,89,52,55,31,29,84,34,93,63,16,83
+44,58,28,54,86,79,27,22,49,62,47,19,11,38,13,42,48,26,61,81,33
+19,64,49,56,28,11,46,44,22,33,62,47,48,79,86
+42,26,28,52,83,95,29,44,54
+11,33,54,32,27,51,16,19,42,95,61,44,56,97,77,13,28,38,49
+19,31,27,95,55,44,77,93,54,63,26,45,52,29,17,83,34,84,18,11,16,32,89
+18,63,16,77,51,32,54,27,44,42,49,33,56,61,62
+49,58,72,86,76,46,13,12,33,47,38,28,79,56,48,97,42,62,61,64,85
+33,56,61,13,48,97,12,22,79,58,76,64,41,45,52
+77,26,51,85,41,54,27,17,34,32,44
+19,62,33,54,95,97,13,26,12,77,32,83,56
+17,26,27,44,19,42,28,38,49,33,56,62,13,48,97,22,86,47,81
+72,48,89,29,97,86,47,22,76,79,58,85,81,41,12,84,31,96,55,45,34,52,64
+77,17,27,11,19,42,33
+95,84,93,27,83,72,34,16,45,55,31,54,52,89,32
+84,63,77,83,38,42,32,27,16,19,26,11,49,34,44,33,17,95,56
+26,54,27,44,19,42,33,56,13,48,97,12,22,86,47,79,81
+47,85,34,18,79,72,64,76,97,46,96
+48,12,17,86,47,62,33,38,32,54,49,11,97,79,44
+28,49,33,56,61,62,13,22,47,76,46,72,41
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+81,46,64,45,52,55,29,34,16,95,77
+27,93,95,18,54,55,83,34,28,52,63,29,31,77,26
+12,55,56,13,89,47,85,46,48,64,58,45,79
+84,16,85,31,52
+47,52,97,31,64,29,41,76,79,46,48,96,86,34,12
+32,93,63,49,44,31,29,42,54
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+41,29,34,32,17,54,11
+42,38,49,56,61,62,13,48,97,86,47,79,81,58,76,46,96,72,85
+89,52,31,93,16,17,26,54,19
+77,42,28,49,97,22,86
+85,89,22,76,47,34,84,81,55,63,29,52,72,18,79,96,58,86,45,31,41
+28,38,49,33,56,61,62,13,48,97,12,86,81,58,76,46,64,96,72,85,41
+32,93,41,52,89,77,64,31,83,84,29,18,63,85,72,34,96,46,45,17,55
+77,51,26,33,48,97,86
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+93,63,83,95,32,27,28,49,61
+38,49,33,56,62,13,48,97,12,86,47,79,58,76,46,64,96,72,85,41,45
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+28,81,12,33,19,97,44,79,42,47,46,11,22,49,38,64,61,62,56,48,76,13,86
+13,49,72,19,22,76,42,97,61,12,48,81,62,86,96,28,33,46,47,79,58,64,38
+64,12,72,96,76,46,45
+27,11,56,62,12,86,47
+84,34,18,93,63,16,83,95,77,51,32,17,26,54,27,44,11,19,28,38,49,33,56
+96,34,52,45,83,16,26,93,64,55,95,29,72,31,51
+62,72,89,96,76,86,64,45,22,56,79,12,41,47,85,52,97,55,61
+11,19,49,56,61,22,79,81,58,64,96
+58,76,46,72,85,41,89,52,55,31,29,34,18,93,16,83,95,77,51
+56,61,62,13,48,22,79,81,76,96,85,41,89,52,55
+26,17,96,18,54,45,16,84,72,93,95
+51,32,17,27,44,11,38,49,33,56,62,13,48,12,22,86,47
+63,16,83,95,77,51,32,17,26,54,27,19,42,28,49,33,61,62,13
+55,29,84,63,17,54,38
+13,48,97,12,22,86,47,79,81,76,46,64,96,72,85,41,45,89,52,55,31,29,84
+32,55,16,51,89,18,93,63,83,52,85,77,95,84,54,96,45,26,29,72,41
+54,27,44,19,42,28,38,61,62,13,97,12,22,86,79
+47,96,52,55,29,34,83
+12,22,47,79,46,96,72,85,41,89,84
+28,51,38,56,17,49,95,26,42,11,77,97,19,44,27,83,54,32,12,61,33,48,13
+64,83,34,26,77,18,55
+28,33,56,61,48,97,22,86,47,79,81,58,76,46,64,96,72,85,41
+38,62,22,19,27,49,28,47,13
+28,83,17,16,26,93,61,34,51
+26,49,62,48,97,12,22,86,58
+97,61,55,52,41,62,22,45,85,64,47,96,13,56,76,81,58
+63,95,77,51,32,17,26,54,27,44,11,42,28,38,49,33,56,61,62,13,48
+86,56,44,62,28,13,33,17,79,54,12,49,11,22,38,32,42,61,48
+11,38,42,54,27,22,62,12,61,19,48,44,49,86,56,81,17,97,33,47,13,28,26
+31,18,93,63,95,77,51,17,26,54,27,11,19,38,49
+63,51,31,55,64,16,84,18,83,76,72,29,85,46,32,52,34
+13,97,86,79,64,72,85,41,84
+55,34,77,51,32,54,11,19,42
+55,95,84,51,16,77,38,27,93,19,54,34,42
+62,11,56,13,38,26,97,48,54,86,27,61,22,17,49,19,77
+54,77,62,27,56,17,16,83,26,97,32,61,95
+45,89,52,31,29,84,18,93,16,83,95,77,51,32,17,54,27,11,19
+17,26,27,11,19,28,49,56,61,62,13,48,12,22,47
+96,72,85,52,55,31,29,84,63,51,17,26,54
+22,86,47,79,81,58,76,46,64,96,72,85,41,45,52,55,31,29,34,18,63
+55,76,79,52,85
+31,29,84,34,18,93,63,16,83,95,77,51,17,26,54,27,44,11,42,28,49
+42,48,13,79,47,19,56,49,11,96,86
+95,77,51,17,54,44,13,48,97,12,22
+41,31,84,16,83,17,54,44,11
+12,41,86,52,93,46,89
+51,61,42,62,18,54,49,95,83,17,56
+81,58,76,46,64,96,72,85,41,45,89,52,55,31,29,34,18,93,63,16,83,95,77
+51,77,42,32,54,17,83,27,49,28,95,61,97,19,48
+11,54,48,51,95,27,17,62,44,28,32,19,61,83,13,49,97,42,33,77,38,26,16
+18,63,16,77,51,17,27,11,19,42,38,49,33,56,62
+86,47,79,81,58,76,46,64,96,72,85,45,89,52,55,31,29,84,34,18,93,63,16
+95,89,41,76,16,63,31,79,52,64,46,72,45,81,55,96,83
+55,84,63,83,17,44,11,42,38
+64,33,28,56,38,47,97,12,86,96,61,81,22,13,79,76,62,11,46,42,48,49,58
+31,97,12,81,41,46,58,89,61
+97,22,81,46,64,72,29
+48,42,64,56,58,11,76,96,47,49,33,81,38,19,86,46,97
+77,51,32,11,49,33,56,62,13,97,86
+58,29,72,79,76,93,86,84,52,89,12,34,85,18,46
+72,45,89,52,55,31,29,34,18,93,63,16,83,77,17,26,27
+33,19,13,77,56,26,11
+89,55,72,31,29,85,12,45,41,22,76,96,86,13,62,79,52,81,47,58,46,48,97
+79,64,96,41,45,29,84,63,16
+44,26,27,83,95,54,49,33,34,42,29
+89,48,79,47,46,22,72,86,97,33,49,96,62
+81,45,46,72,93,52,58,79,95,76,63,83,89,84,31,55,41,29,34,96,85
+33,86,96,81,58,85,72,97,13,46,48,79,76,61,12,22,64,89,52,47,62,45,41
+76,64,72,85,41,89,52,55,34,93,16,83,95,77,32
+33,56,61,48,97,12,22,86,47,79,81,76,46,89,52
+34,95,51,54,27,42,33,56,61
+77,51,32,17,26,54,27,44,11,19,42,28,38,49,33,56,61,62,13,48,97,12,22
+63,51,55,76,58,45,46,16,95,64,72,96,34
+42,13,11,54,49,27,62,38,83,26,93,77,32,28,16,51,63,95,33,17,61,19,44
+63,51,38,31,54,84,29,55,28,44,77
+61,62,13,48,97,22,47,81,58,46,96,72,41,89,52,55,31
+97,12,22,86,47,81,58,76,46,64,72,85,41,45,89,52,31,29,84,34,18
+31,93,16,95,26,27,49
+48,33,56,51,26,28,38,63,62,42,54,11,44,95,77
+79,42,28,96,12,86,56,47,38,49,81,33,72,48,61
+81,58,76,64,41,45,55,31,84,34,93,63,83,95,77
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+84,93,63,16,95,17,19,38,56
+95,84,89,45,41,76,79
+33,54,97,86,79,38,27,17,22,47,62,13,44,49,28,42,48,11,32,12,26,61,56
+34,18,93,63,83,95,77,32,17,26,54,27,11,19,42,49,33,56,61
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+62,47,81,58,76,85,45,52,55,31,29
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+38,11,27,58,49,81,97,28,48,47,86,42,79,13,61,44,76,12,56,19,62,22,54
+54,61,11,95,44,49,26,62,51,18,63,56,28
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+29,41,63,44,18,11,32,45,27
+85,89,32,18,83,95,51,55,72,93,64,84,63,26,96,34,41,16,45,31,77
+44,47,64,13,49,33,56
+79,55,52,58,46,95,41
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+77,51,32,17,26,54,27,44,11,19,28,38,49,33,61,62,48,22,86
+54,28,49,33,61,62,97,22,76
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+33,56,61,62,48,22,79,58,72
+38,28,48,12,26,58,86
+12,42,38,22,51,47,61
+56,38,62,13,86,79,27,28,44,12,97,81,46,49,33,47,61
+18,76,51,29,52,83,41
+13,48,97,12,86,47,81,46,96,72,85,45,84
+97,12,22,86,47,79,81,58,76,46,96,72,85,45,89,52,55,31,29,34,18
+58,47,19,12,26,11,79,42,13,44,22,33,38,54,49,56,61,62,86,27,48
+11,19,42,28,38,49,33,61,62,13,48,97,12,22,86,47,79,81,58,76,46,64,96
+28,49,56,61,13,48,86,81,58,76,46
diff --git a/05/mylib.c b/05/mylib.c
new file mode 100644
index 0000000..a8a4205
--- /dev/null
+++ b/05/mylib.c
@@ -0,0 +1,84 @@
+#include "_.h"
+
+// NOT MY CODE
+// https://stackoverflow.com/questions/9210528/split-string-with-delimiters-in-c
+char** str_split(char* str, const char a_delim)
+{
+	char *a_str = strdup(str);
+    char** result    = 0;
+    size_t count     = 0;
+    char* tmp        = a_str;
+    char* last_comma = 0;
+    char delim[2];
+    delim[0] = a_delim;
+    delim[1] = 0;
+
+    while (*tmp)
+    {
+        if (a_delim == *tmp)
+        {
+            count++;
+            last_comma = tmp;
+        }
+        tmp++;
+    }
+
+    count += last_comma < (a_str + strlen(a_str) - 1);
+
+    count++;
+
+    result = malloc(sizeof(char*) * count);
+
+    if (result)
+    {
+        size_t idx  = 0;
+        char* token = strtok(a_str, delim);
+
+        while (token)
+        {
+            //assert(idx < count);
+            *(result + idx++) = strdup(token);
+            token = strtok(0, delim);
+        }
+        //assert(idx == count - 1);
+        *(result + idx) = 0;
+    }
+
+	free(a_str);
+    return result;
+}
+
+int str_index(char *str, char c) {
+
+    int i = 0;
+    while (str[i])
+        if (str[i++] == c)
+            return i;
+
+    return -1;
+}
+
+int number_of_element(char *str, char c) {
+	int nbr = 0;
+	for (int i = 0; str[i] != '\0'; i++)
+        if (str[i] == c)
+            nbr++;
+    return nbr;
+}
+
+long gmc(long a, long b) {
+    if (b == 0)
+        return a;
+    return gmc(b, a % b);
+}
+
+long lmc(long a, long b) {
+    return (a / gmc(a, b)) * b;
+}
+
+long lmcs(int array[], int n) {
+    long result = array[0];
+    for (int i = 1; i < n; i++)
+        result = lmc(result, array[i]);
+    return result;
+}
diff --git a/05/part1.c b/05/part1.c
new file mode 100644
index 0000000..09da25b
--- /dev/null
+++ b/05/part1.c
@@ -0,0 +1,66 @@
+#include "_.h"
+
+int strslen(char **strs) {
+    int count = 0;
+    for (int i = 0; strs[i] != NULL; i++)
+        count++;
+    return count;
+}
+
+int is_first(char **inputs_1, int verif, int verif_2, int j, int k) {
+
+    for (int i = 0; inputs_1[i] != NULL; i++) {
+        char **inputs_1_split = str_split(inputs_1[i], '|');
+        int number_left = atoi(inputs_1_split[0]);
+        int number_right = atoi(inputs_1_split[1]);
+
+        if (number_left != verif && number_right != verif)
+            continue;
+        if (number_left != verif_2 && number_right != verif_2)
+            continue;
+
+        if (j > k) {
+            if (number_left == verif)
+                continue;
+            else
+                return 0;
+        }
+        else {
+            if (number_right == verif)
+                continue;
+            else
+                return 0;
+        }
+    }
+
+    return 1;
+}
+
+int main(int argc, char **argv) {
+	
+	if (argc != 3)
+		return 1;
+
+	char **inputs_1 = str_split(strdup(argv[1]), '\n');
+	char **inputs_2 = str_split(strdup(argv[2]), '\n');
+
+    int count = 0;
+	for (int i = 0; inputs_2[i] != NULL; i++) {
+        char **inputs_2_comma = str_split(inputs_2[i], ',');
+        int is_good = 1;
+        for (int j = 0; inputs_2_comma[j] != NULL; j++) {
+            int verif = atoi(inputs_2_comma[j]);
+            for (int k = 0; inputs_2_comma[k] != NULL; k++) {
+                int verif_2 = atoi(inputs_2_comma[k]);
+                if (k != j)
+                    is_good = is_first(inputs_1, verif_2, verif, j, k) == 0 ? 0 : is_good;
+            }
+        }
+        if (is_good)
+            count += atoi(inputs_2_comma[strslen(inputs_2_comma) / 2]);
+	}
+
+    printf("count: %d\n", count);
+
+	return 0;
+}
diff --git a/05/part1.sh b/05/part1.sh
new file mode 100755
index 0000000..aa498cb
--- /dev/null
+++ b/05/part1.sh
@@ -0,0 +1 @@
+gcc -lm -g -Wall -Wextra -include_.h part1.c mylib.c
diff --git a/05/part2.c b/05/part2.c
new file mode 100644
index 0000000..275cba5
--- /dev/null
+++ b/05/part2.c
@@ -0,0 +1,82 @@
+#include "_.h"
+
+int strslen(char **strs) {
+    int count = 0;
+    for (int i = 0; strs[i] != NULL; i++)
+        count++;
+    return count;
+}
+
+int is_first(char ***inputs_1_split, int verif, int verif_2, int j, int k) {
+
+    for (int i = 0; inputs_1_split[i] != NULL; i++) {
+        int number_left = atoi(inputs_1_split[i][0]);
+        int number_right = atoi(inputs_1_split[i][1]);
+
+        if (number_left != verif && number_right != verif)
+            continue;
+        if (number_left != verif_2 && number_right != verif_2)
+            continue;
+
+        if (j > k) {
+            if (number_left == verif)
+                continue;
+            else
+                return 0;
+        }
+        else {
+            if (number_right == verif)
+                continue;
+            else
+                return 0;
+        }
+    }
+
+    return 1;
+}
+
+void swap(char **str_1, char **str_2) {
+    char *tmp = *str_1;
+    *str_1 = *str_2;
+    *str_2 = tmp;
+}
+
+int main(int argc, char **argv) {
+	
+	if (argc != 3)
+		return 1;
+
+	char **inputs_1 = str_split(strdup(argv[1]), '\n');
+    char ***inputs_1_split = calloc(strslen(inputs_1) + 1, sizeof(char**));
+    for (int i = 0; inputs_1[i] != NULL; i++)
+        inputs_1_split[i] = str_split(inputs_1[i], '|');
+    char **inputs_2 = str_split(strdup(argv[2]), '\n');
+
+    int count = 0;
+	for (int i = 0; inputs_2[i] != NULL; i++) {
+        char **inputs_2_comma = str_split(inputs_2[i], ',');
+        int is_good = 1;
+        int is_good_final = 1;
+        for (int j = 0; inputs_2_comma[j] != NULL; j++) {
+            int verif = atoi(inputs_2_comma[j]);
+            for (int k = 0; inputs_2_comma[k] != NULL; k++) {
+                int verif_2 = atoi(inputs_2_comma[k]);
+                if (k != j)
+                    is_good = is_first(inputs_1_split, verif_2, verif, j, k);
+                is_good_final = is_good == 0 ? 0 : is_good_final;
+                if (!is_good) {
+                    swap(&inputs_2_comma[j], &inputs_2_comma[k]);
+                    j = 0;
+                    break;
+                }
+            }
+        }
+        if (!is_good_final) {
+            count += atoi(inputs_2_comma[strslen(inputs_2_comma) / 2]);
+        }
+	}
+
+    printf("count: %d\n", count);
+
+	return 0;
+}
diff --git a/05/part2.sh b/05/part2.sh
new file mode 100755
index 0000000..49cebe1
--- /dev/null
+++ b/05/part2.sh
@@ -0,0 +1 @@
+gcc -O3 -Ofast -g3 -lm -Wall -Wextra -include_.h part2.c mylib.c
diff --git a/05/test.txt b/05/test.txt
new file mode 100644
index 0000000..471c7ec
--- /dev/null
+++ b/05/test.txt
@@ -0,0 +1,21 @@
+47|53
+97|13
+97|61
+97|47
+75|29
+61|13
+75|53
+29|13
+97|29
+53|29
+61|53
+97|53
+61|29
+47|13
+75|47
+97|75
+47|61
+75|61
+47|29
+75|13
+53|13
diff --git a/05/test2.txt b/05/test2.txt
new file mode 100644
index 0000000..895fa37
--- /dev/null
+++ b/05/test2.txt
@@ -0,0 +1,6 @@
+75,47,61,53,29
+97,61,53,29,13
+75,29,13
+75,97,47,61,53
+61,13,29
+97,13,75,29,47
diff --git a/template/_.h b/template/_.h
index 3f93823..c0a4ec4 100644
--- a/template/_.h
+++ b/template/_.h
@@ -23,3 +23,5 @@ int number_of_element(char *str, char c);
 long gmc(long a, long b);
 long lmc(long a, long b);
 long lmcs(int array[], int n);
+
+long strslen(char **strs);
diff --git a/template/mylib.c b/template/mylib.c
index a8a4205..87fbf66 100644
--- a/template/mylib.c
+++ b/template/mylib.c
@@ -82,3 +82,10 @@ long lmcs(int array[], int n) {
         result = lmc(result, array[i]);
     return result;
 }
+
+long strslen(char **strs) {
+    long count = 0;
+    while (strs[count])
+        count++;
+    return count;
+}
diff --git a/template/part1.sh b/template/part1.sh
index aa498cb..3dc1d88 100644
--- a/template/part1.sh
+++ b/template/part1.sh
@@ -1 +1 @@
-gcc -lm -g -Wall -Wextra -include_.h part1.c mylib.c
+gcc -O3 -Ofast -lm -g -Wall -Wextra -include_.h part1.c mylib.c
diff --git a/template/part2.sh b/template/part2.sh
index db92d5f..1d538f7 100644
--- a/template/part2.sh
+++ b/template/part2.sh
@@ -1 +1 @@
-gcc -lm -g -Wall -Wextra -include_.h part2.c mylib.c
+gcc -O3 -Ofast -lm -g -Wall -Wextra -include_.h part2.c mylib.c