diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..4a2ea06
Binary files /dev/null and b/.DS_Store differ
diff --git a/src/.DS_Store b/src/.DS_Store
new file mode 100644
index 0000000..24d6115
Binary files /dev/null and b/src/.DS_Store differ
diff --git a/src/brackets/index.js b/src/brackets/index.js
index 96b6766..89cc154 100644
--- a/src/brackets/index.js
+++ b/src/brackets/index.js
@@ -4,6 +4,42 @@
  * @param {string} str The string of brackets.
  * @returns {"valid" | "invalid"} Whether or not the string is valid.
  */
-function isValid(str) {}
+
+
+
+        
+function isValid(str) {
+    
+    const stack = [];
+    let bracketsString = {
+        '(':')',
+        '{':'}',
+        '[':']',
+    };   
+
+    for (let i = 0; i < str.length; i++) {
+        let char = str[i];
+        if (bracketsString[char]) {
+            stack.push(char);
+        } else if (char == ')' || char == '}' || char == ']') {
+            let lastBracket = stack.pop();
+        
+            if (bracketsString[lastBracket] != char) {
+                return "invalid";
+                
+            }
+        }
+    }
+
+   return stack.length == 0 ? "valid" : "invalid"
+    }
+
+    // // Test cases
+    // const testStrings = //"({()}[()]}";
+    // "{{{()[]" ;
+    //console.log(isValid(testStrings))
+    
+    
+
 
 module.exports = isValid;
diff --git a/src/roman-numerals/index.js b/src/roman-numerals/index.js
index 38afb19..4664c94 100644
--- a/src/roman-numerals/index.js
+++ b/src/roman-numerals/index.js
@@ -4,6 +4,34 @@
  * @param {string} roman The all-caps Roman numeral between 1 and 3999 (inclusive).
  * @returns {number} The decimal equivalent.
  */
-function romanToDecimal(roman) {}
+function romanToDecimal(roman) {
+
+    let romanDict = {
+        'I': 1, 'V': 5, 'X': 10, 'L': 50, 'C': 100, 'D': 500, 'M': 1000
+    };
+
+    let decimal = 0;
+    let prevValue = 0;
+
+    for (let i = roman.length - 1; i >= 0; i--) {
+        let symbol = roman[i];
+        let value = romanDict[symbol];
+
+        if (value >= prevValue) {
+            decimal += value;
+        } else {
+            decimal -= value;
+        }
+
+        prevValue = value;
+    }
+
+    return decimal;
+} 
+
+let testCases = "XXIV"//expected: 24  'MCMXCIV', expected: 1994 },
+    // Add more test cases here
+//console.log()
+console.log(romanToDecimal(testCases));
 
 module.exports = romanToDecimal;
diff --git a/src/transpose/index.js b/src/transpose/index.js
index adec201..42c86c9 100644
--- a/src/transpose/index.js
+++ b/src/transpose/index.js
@@ -4,6 +4,17 @@
  * @param {number[]} array The array to transpose
  * @returns {number[]} The transposed array
  */
-function transpose(array) {}
 
+let numberArr = [
+    [5, 12, 17, 9, 3],
+    [13, 4, 8, 14, 1],
+    [9, 6, 3, 7, 21],
+  ];
+
+let newArr = transpose(numberArr);
+
+function transpose(array) {
+return array[0].map((col, i) => array.map(row =>row[i]));
+}
+console.log(newArr)
 module.exports = transpose;