From ab289ac12e95dd4428beea2eefba569a845b4e05 Mon Sep 17 00:00:00 2001
From: doitchuu <seulgichu14@gmail.com>
Date: Tue, 31 Mar 2026 08:51:48 +0900
Subject: [PATCH 1/2] =?UTF-8?q?feat:=20Longest=20Common=20Prefix=20?=
 =?UTF-8?q?=ED=92=80=EC=9D=B4=20=EC=9E=91=EC=84=B1?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 doitchuu/LongestCommonPrefix.js | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 doitchuu/LongestCommonPrefix.js

diff --git a/doitchuu/LongestCommonPrefix.js b/doitchuu/LongestCommonPrefix.js
new file mode 100644
index 0000000..78bbc4c
--- /dev/null
+++ b/doitchuu/LongestCommonPrefix.js
@@ -0,0 +1,21 @@
+/**
+ * @param {string[]} strs
+ * @return {string}
+ */
+var longestCommonPrefix = function(strs) {
+    let prefix = "";
+
+    for (let i = 0; i < strs[0].length; i++) {
+        const current = strs[0][i];
+
+        for (let j = 1; j < strs.length; j++) {
+            if (strs[j][i] !== current) {
+                return prefix;
+            }
+        }
+
+        prefix += current;
+    }
+
+    return prefix;
+};

From 95a07ff72e1c6f8c840df68020d35d3d6f465097 Mon Sep 17 00:00:00 2001
From: doitchuu <seulgichu14@gmail.com>
Date: Tue, 31 Mar 2026 08:54:39 +0900
Subject: [PATCH 2/2] =?UTF-8?q?feat:=20Single=20Number=20=ED=92=80?=
 =?UTF-8?q?=EC=9D=B4=20=EC=9E=91=EC=84=B1?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 doitchuu/SingleNumber.js | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 doitchuu/SingleNumber.js

diff --git a/doitchuu/SingleNumber.js b/doitchuu/SingleNumber.js
new file mode 100644
index 0000000..3622a32
--- /dev/null
+++ b/doitchuu/SingleNumber.js
@@ -0,0 +1,17 @@
+/**
+ * @param {number[]} nums
+ * @return {number}
+ */
+var singleNumber = function(nums) {
+    const map = new Map();
+
+    for (let i = 0; i < nums.length; i++) {
+        map.set(nums[i], (map.get(nums[i]) || 0) + 1);
+    }
+
+    for (const [key, value] of map) {
+        if (value === 1) {
+            return key;
+        }
+    }
+};