From c1202385342b15361811fb5dbb94163db89527ae Mon Sep 17 00:00:00 2001
From: "hjeom.dev" <hjeom.dev@gmail.com>
Date: Mon, 29 Dec 2025 20:45:54 +0900
Subject: [PATCH 1/2] Reverse Bits

---
 reverse-bits/hjeomdev.java | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 reverse-bits/hjeomdev.java

diff --git a/reverse-bits/hjeomdev.java b/reverse-bits/hjeomdev.java
new file mode 100644
index 0000000000..2240d036ff
--- /dev/null
+++ b/reverse-bits/hjeomdev.java
@@ -0,0 +1,15 @@
+class Solution {
+    public int reverseBits(int n) {
+        String origin = Integer.toBinaryString(n);
+        origin = String.format("%32s", origin).replace(' ', '0');
+        String reversed = "";
+        for (int i = origin.length() - 1; i >= 0; i--) {
+            reversed += origin.charAt(i);
+        }
+        // System.out.println(origin);
+        // System.out.println(reversed);
+        int result = Integer.parseInt(reversed, 2);
+        // System.out.println(result);
+        return result;
+    }
+}

From 0a9444cd50c446d2b8db95706fffa7d58fbf9f7d Mon Sep 17 00:00:00 2001
From: "hjeom.dev" <hjeom.dev@gmail.com>
Date: Mon, 9 Feb 2026 23:52:44 +0900
Subject: [PATCH 2/2] Counting Bits

---
 counting-bits/hjeomdev.java | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 counting-bits/hjeomdev.java

diff --git a/counting-bits/hjeomdev.java b/counting-bits/hjeomdev.java
new file mode 100644
index 0000000000..fd05b36405
--- /dev/null
+++ b/counting-bits/hjeomdev.java
@@ -0,0 +1,18 @@
+class Solution {
+    public int[] countBits(int n) {
+        // 0 ~ n 까지 2진수를 구하고, 그 수의 모든 자릿값의 합을 구해야함
+
+        int[] result = new int[n + 1];
+
+        for (int i = 0; i <= n; i++) {
+            String binaryString = Integer.toBinaryString(i);
+            int sum = 0;
+            for (int j = 0 ; j < binaryString.length(); j++) {
+                sum += binaryString.charAt(j) - '0';
+            }
+            result[i] = sum;
+        }
+
+        return result;
+    }
+}