From 26d9c714f4ca41e9edc525fa7eaafbcc960b8ab1 Mon Sep 17 00:00:00 2001
From: sik9252 <sik9252@naver.com>
Date: Thu, 19 Mar 2026 23:48:55 +0900
Subject: [PATCH 1/2] =?UTF-8?q?feat:=20ContainsDuplicate=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

---
 sik9252/ ContainsDuplicate.js | 4 ++++
 1 file changed, 4 insertions(+)
 create mode 100644 sik9252/ ContainsDuplicate.js

diff --git a/sik9252/ ContainsDuplicate.js b/sik9252/ ContainsDuplicate.js
new file mode 100644
index 0000000..f3e3122
--- /dev/null
+++ b/sik9252/ ContainsDuplicate.js	
@@ -0,0 +1,4 @@
+var containsDuplicate = function (nums) {
+  const removeDuplicate = new Set(nums);
+  return nums.length === removeDuplicate.size ? false : true;
+};

From 07a1ac23fec398c3b3a6fe865dd66decdbc9410a Mon Sep 17 00:00:00 2001
From: sik9252 <sik9252@naver.com>
Date: Thu, 19 Mar 2026 23:49:05 +0900
Subject: [PATCH 2/2] =?UTF-8?q?feat:=20RomanToInteger=20=ED=92=80=EC=9D=B4?=
 =?UTF-8?q?=20=EC=9E=91=EC=84=B1?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 sik9252/ RomanToInteger.js | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 sik9252/ RomanToInteger.js

diff --git a/sik9252/ RomanToInteger.js b/sik9252/ RomanToInteger.js
new file mode 100644
index 0000000..feba44a
--- /dev/null
+++ b/sik9252/ RomanToInteger.js	
@@ -0,0 +1,26 @@
+var romanToInt = function (s) {
+  const map = {
+    I: 1,
+    V: 5,
+    X: 10,
+    L: 50,
+    C: 100,
+    D: 500,
+    M: 1000,
+  };
+
+  let result = 0;
+
+  for (let i = 0; i < s.length; i++) {
+    const current = map[s[i]];
+    const next = map[s[i + 1]];
+
+    if (current < next) {
+      result -= current;
+    } else {
+      result += current;
+    }
+  }
+
+  return result;
+};