diff --git a/HamSungJun/HashTable/Solution_350.ts b/HamSungJun/HashTable/Solution_350.ts
new file mode 100644
index 0000000..2b9e87b
--- /dev/null
+++ b/HamSungJun/HashTable/Solution_350.ts
@@ -0,0 +1,25 @@
+/**
+ * @param {number[]} nums1
+ * @param {number[]} nums2
+ * @return {number[]}
+ */
+const intersect = function (nums1: number[], nums2: number[]): number[] {
+  const countMap = new Map()
+  const result: number[] = []
+  nums1.forEach(n1 => {
+    if (countMap.has(n1)) {
+      countMap.set(n1, countMap.get(n1) + 1)
+    } else {
+      countMap.set(n1, 1)
+    }
+  })
+  nums2.forEach(n2 => {
+    if (countMap.has(n2) && countMap.get(n2) > 0) {
+      result.push(n2)
+      countMap.set(n2, countMap.get(n2) - 1)
+    }
+  })
+  return result
+}
+
+console.log(intersect([4, 9, 5], [9, 4, 9, 8, 4]))
diff --git a/HamSungJun/HashTable/Solution_389.ts b/HamSungJun/HashTable/Solution_389.ts
new file mode 100644
index 0000000..c3d8c4b
--- /dev/null
+++ b/HamSungJun/HashTable/Solution_389.ts
@@ -0,0 +1,22 @@
+function findTheDifference (s: string, t: string): string {
+  const countMap = new Map()
+  let answer = ''
+  for (let i = 0; i < s.length; i++) {
+    const nextChar = s[i]
+    if (countMap.has(nextChar)) {
+      countMap.set(nextChar, countMap.get(nextChar) + 1)
+    } else {
+      countMap.set(nextChar, 1)
+    }
+  }
+  for (let i = 0; i < t.length; i++) {
+    const nextChar = t[i]
+    if (countMap.has(nextChar) && countMap.get(nextChar) > 0) {
+      countMap.set(nextChar, countMap.get(nextChar) - 1)
+    } else {
+      answer = nextChar
+      break
+    }
+  }
+  return answer
+};
diff --git a/HamSungJun/HashTable/Solution_748.ts b/HamSungJun/HashTable/Solution_748.ts
new file mode 100644
index 0000000..c5c4e23
--- /dev/null
+++ b/HamSungJun/HashTable/Solution_748.ts
@@ -0,0 +1,46 @@
+function shortestCompletingWord (licensePlate: string, words: string[]): string {
+  const licenseCountMap: Map<string, number> = new Map()
+  words.sort((a, b) => {
+    const aLen = a.length
+    const bLen = b.length
+    return Number(aLen < bLen) - Number(aLen > bLen)
+  })
+  console.log(words)
+  for (let i = 0; i < licensePlate.length; i++) {
+    const nextChar = licensePlate[i]
+    const nextCharCode = nextChar.charCodeAt(0)
+    if ((nextCharCode >= 65 && nextCharCode <= 90) || (nextCharCode >= 97 && nextCharCode <= 122)) {
+      const nextLowerChar = nextChar.toLowerCase()
+      if (licenseCountMap.has(nextLowerChar)) {
+        licenseCountMap.set(nextLowerChar, licenseCountMap.get(nextLowerChar) as number + 1)
+      } else {
+        licenseCountMap.set(nextLowerChar, 1)
+      }
+    }
+  }
+  for (let i = 0; i < words.length; i++) {
+    if (isCompletingWord(licenseCountMap, words[i])) {
+      return words[i]
+    }
+  }
+};
+
+function isCompletingWord (map: Map<string, number>, word: string): boolean {
+  const wordCountMap = new Map()
+  for (let i = 0; i < word.length; i++) {
+    const nextChar = word[i]
+    if (wordCountMap.has(nextChar)) {
+      wordCountMap.set(nextChar, wordCountMap.get(nextChar) + 1)
+    } else {
+      wordCountMap.set(nextChar, 1)
+    }
+  }
+  for (const [k, v] of map) {
+    if (!wordCountMap.has(k)) {
+      return false
+    } else if (v > wordCountMap.get(k)) {
+      return false
+    }
+  }
+  return true
+}