diff --git a/container-with-most-water/HerrineKim.js b/container-with-most-water/HerrineKim.js
new file mode 100644
index 000000000..d8e22eb57
--- /dev/null
+++ b/container-with-most-water/HerrineKim.js
@@ -0,0 +1,26 @@
+// 시간복잡도: O(n)
+// 공간복잡도: O(1)
+
+/**
+ * @param {number[]} height
+ * @return {number}
+ */
+var maxArea = function (height) {
+  let maxWater = 0;
+  let left = 0;
+  let right = height.length - 1;
+
+  while (left < right) {
+    const lowerHeight = Math.min(height[left], height[right]);
+    const width = right - left;
+    maxWater = Math.max(maxWater, lowerHeight * width);
+
+    if (height[left] < height[right]) {
+      left++;
+    } else {
+      right--;
+    }
+  }
+
+  return maxWater;
+};
diff --git a/valid-parentheses/HerrineKim.js b/valid-parentheses/HerrineKim.js
new file mode 100644
index 000000000..28a56c499
--- /dev/null
+++ b/valid-parentheses/HerrineKim.js
@@ -0,0 +1,33 @@
+// 시간복잡도: O(n)
+// 공간복잡도: O(n)
+
+// 스택을 사용하여 괄호의 유효성을 검사
+// 괄호가 열리면 스택에 추가하고 닫히면 스택에서 마지막 요소를 꺼내서 짝이 맞는지 확인
+// 스택이 비어있으면 유효한 괄호 문자열
+
+/**
+ * @param {string} s
+ * @return {boolean}
+ */
+var isValid = function (s) {
+  const bracketStack = [];
+  const bracketPairs = {
+    ')': '(',
+    '}': '{',
+    ']': '['
+  };
+
+  for (const char of s) {
+    if (char in bracketPairs) {
+      const lastChar = bracketStack.pop();
+
+      if (lastChar !== bracketPairs[char]) {
+        return false;
+      }
+    } else {
+      bracketStack.push(char);
+    }
+  }
+
+  return bracketStack.length === 0;
+};