Feat: Add solution of top-k-frequent-elements

Author: easyone

top-k-frequent-elements/easyone-jwlee.go

@@ -0,0 +1,20 @@
+func topKFrequent(nums []int, k int) []int {
+	m := make(map[int]int)
+	for _, num := range nums {
+		m[num]++
+	}
+	a := make([][]int, len(nums)+1)
+	for key, num := range m {
+		a[num] = append(a[num], key)
+	}
+	result := make([]int, 0)
+	for i := cap(a) - 1; i >= 0; i-- {
+		if len(a[i]) > 0 {
+			result = append(result, a[i]...)
+		}
+		if len(result) == k {
+			break
+		}
+	}
+	return result
+}