diff --git a/container-with-most-water/robinyoon-dev.js b/container-with-most-water/robinyoon-dev.js
new file mode 100644
index 0000000000..42a372f35f
--- /dev/null
+++ b/container-with-most-water/robinyoon-dev.js
@@ -0,0 +1,32 @@
+/**
+ * @param {number[]} height
+ * @return {number}
+ */
+var maxArea = function (height) {
+
+    // 투 포인터
+    // 왼쪽 포인터, 오른쪽 포인터. lower 라인의 포인터를 움직여야함.
+
+    let leftPointer = 0;
+    let rightPointer = height.length - 1;
+    let tempMax = 0;
+
+    while (leftPointer !== rightPointer) {
+        let areaHeight = Math.min(height[leftPointer], height[rightPointer]);
+
+        let areaWidth = rightPointer - leftPointer;
+
+        let waterArea = areaHeight * areaWidth;
+
+        tempMax = Math.max(tempMax, waterArea);
+
+        if (height[leftPointer] < height[rightPointer]) {
+            leftPointer++;
+        } else {
+            rightPointer--;
+        }
+    }
+
+    return tempMax;
+
+};
diff --git a/valid-parentheses/robinyoon-dev.js b/valid-parentheses/robinyoon-dev.js
index 5dc3b6754d..cf45473046 100644
--- a/valid-parentheses/robinyoon-dev.js
+++ b/valid-parentheses/robinyoon-dev.js
@@ -3,25 +3,63 @@
  * @return {boolean}
  */
 var isValid = function (s) {
-
-    const tempArray = [];
-    const pairObject = {
+    const bracketsObj = {
         ')': '(',
         '}': '{',
         ']': '['
     }
+    const stackArray = [];
+
+    for (let i = 0; i < s.length; i++) {
 
-    for (const ch of s) {
-        if (ch === '(' || ch === '{' || ch === '[') {
-            tempArray.push(ch);
+        let currentBracket = s[i];
+        let isRightBracket = currentBracket in bracketsObj;
+
+        if (!isRightBracket) {
+            stackArray.push(currentBracket);
+            continue;
+        }
+
+        let isPair = stackArray[stackArray.length - 1] == bracketsObj[currentBracket];
+
+        if (isPair) {
+            stackArray.pop();
         } else {
-            if (tempArray.pop() !== pairObject[ch]) {
-                return false;
-            }
+            return false;
         }
     }
 
-    return tempArray.length === 0;
+    return stackArray.length === 0
+
 };
 
 
+// -----6기 활동 시의 풀이----
+// /**
+//  * @param {string} s
+//  * @return {boolean}
+//  */
+// var isValid = function (s) {
+
+//     const tempArray = [];
+//     const pairObject = {
+//         ')': '(',
+//         '}': '{',
+//         ']': '['
+//     }
+
+//     for (const ch of s) {
+//         if (ch === '(' || ch === '{' || ch === '[') {
+//             tempArray.push(ch);
+//         } else {
+//             if (tempArray.pop() !== pairObject[ch]) {
+//                 return false;
+//             }
+//         }
+//     }
+
+//     return tempArray.length === 0;
+// };
+
+
+