diff --git a/03/part1.php b/03/part1.php
index ada3330..6fcc241 100644
--- a/03/part1.php
+++ b/03/part1.php
@@ -2,18 +2,10 @@
 
 $input = file('input', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
 $input = array_map(fn($line) => str_split($line), $input);
-
-$o2 = $co2 = $input;
-
+$gamma = $epsilon = [];
 for ($i = 0; $i < count($input[0]); $i++) {
-    if (count($o2) > 1) {
-        $bit = (int)(array_sum($column = array_column($o2, $i)) >= ceil(count($column) / 2));
-        $o2 = array_filter($o2, fn($line) => $line[$i] == $bit);
-    }
-
-    if (count($co2) > 1) {
-        $bit = (int) (array_sum($column = array_column($co2, $i)) >= ceil(count($column) / 2));
-        $co2 = array_filter($co2, fn ($line) => $line[$i] != $bit);
-    }
+    $bit = (int) (array_sum($column = array_column($input, $i)) >= ceil(count($column) / 2));
+    $gamma[] = $bit;
+    $epsilon[] = ~$bit & 1;
 }
-echo bindec(implode('', reset($co2))) * bindec(implode('', reset($o2)));
\ No newline at end of file
+echo bindec(implode('', $gamma)) * bindec(implode('', $epsilon)).PHP_EOL; //3813416
diff --git a/03/part2.php b/03/part2.php
index d40b7bb..1fb83ff 100644
--- a/03/part2.php
+++ b/03/part2.php
@@ -2,10 +2,18 @@
 
 $input = file('input', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
 $input = array_map(fn($line) => str_split($line), $input);
-$gamma = $epsilon = [];
+
+$o2 = $co2 = $input;
+
 for ($i = 0; $i < count($input[0]); $i++) {
-    $bit = (int) (array_sum($column = array_column($input, $i)) >= ceil(count($column) / 2));
-    $gamma[] = $bit;
-    $epsilon[] = ~$bit & 1;
+    if (count($o2) > 1) {
+        $bit = (int)(array_sum($column = array_column($o2, $i)) >= ceil(count($column) / 2));
+        $o2 = array_filter($o2, fn($line) => $line[$i] == $bit);
+    }
+
+    if (count($co2) > 1) {
+        $bit = (int) (array_sum($column = array_column($co2, $i)) >= ceil(count($column) / 2));
+        $co2 = array_filter($co2, fn ($line) => $line[$i] != $bit);
+    }
 }
-echo bindec(implode('', $gamma)) * bindec(implode('', $epsilon)).PHP_EOL;
+echo bindec(implode('', reset($co2))) * bindec(implode('', reset($o2))); //2990784
\ No newline at end of file
diff --git a/README.md b/README.md
index e8f4ea2..f00d616 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,16 @@
 # advent_of_code_2021
 
+### DAY 1
+
+- [part1](01/part1.php)
+- [part2](01/part2.php)
+
+### DAY 2
+
+- [part1](02/part1.php)
+- [part2](02/part2.php)
+
+### DAY 3
+
+- [part1](03/part1.php)
+- [part2](03/part2.php)
\ No newline at end of file