diff --git a/HamSungJun/Solution_1518.ts b/HamSungJun/Solution_1518.ts
new file mode 100644
index 0000000..f387366
--- /dev/null
+++ b/HamSungJun/Solution_1518.ts
@@ -0,0 +1,8 @@
+function restoreString (s: string, indices: number[]): string {
+  const strArray: string[] = new Array(s.length)
+  for (let i = 0; i < indices.length; i++) {
+    const nextIdx = indices[i]
+    strArray[nextIdx] = s[i]
+  }
+  return strArray.join('')
+};
diff --git a/HamSungJun/Solution_1603.ts b/HamSungJun/Solution_1603.ts
new file mode 100644
index 0000000..084c399
--- /dev/null
+++ b/HamSungJun/Solution_1603.ts
@@ -0,0 +1,24 @@
+class ParkingSystem {
+  carSlots = new Array(3).fill(0)
+  constructor (big: number, medium: number, small: number) {
+    this.carSlots[0] = big
+    this.carSlots[1] = medium
+    this.carSlots[2] = small
+  }
+
+  addCar (carType: number): boolean {
+    const nextSlot = carType - 1
+    if (this.carSlots[nextSlot] === 0) {
+      return false
+    } else {
+      this.carSlots[nextSlot] -= 1
+      return true
+    }
+  }
+}
+
+/**
+ * Your ParkingSystem object will be instantiated and called as such:
+ * var obj = new ParkingSystem(big, medium, small)
+ * var param_1 = obj.addCar(carType)
+ */
diff --git a/HamSungJun/Solution_1913.ts b/HamSungJun/Solution_1913.ts
new file mode 100644
index 0000000..9b4ec03
--- /dev/null
+++ b/HamSungJun/Solution_1913.ts
@@ -0,0 +1,6 @@
+function maxProductDifference (nums: number[]): number {
+  nums.sort((a, b) => {
+    return Number(a > b) - Number(a < b)
+  })
+  return (nums[nums.length - 1] * nums[nums.length - 2]) - (nums[0] * nums[1])
+};