Add 1207 unique number of occurences

typescript/src/1207-unique-number-of-occ.ts

@@ -0,0 +1,35 @@
+export function uniqueOccurrences(arr: number[]): boolean {
+  const map: Map<number, number> = new Map()
+
+  arr.forEach((a) => {
+    if (map.has(a)) {
+      map.set(a, map.get(a)! + 1)
+    } else {
+      map.set(a, 1)
+    }
+  })
+
+  const set: Set<number> = new Set()
+
+  for (const v of map.values()) {
+    set.add(v)
+  }
+
+  let sum = 0
+
+  set.forEach((s) => {
+    sum += s
+  })
+
+  return sum === arr.length
+}
+
+if (import.meta.vitest) {
+  const { test, expect } = import.meta.vitest
+  test('test one', () => {
+    expect(uniqueOccurrences([1, 2, 2, 1, 1, 3])).toBeTruthy()
+  })
+  test('test one', () => {
+    expect(uniqueOccurrences([1, 2])).toBeFalsy()
+  })
+}